Power Supply Switching/ Gacun Untuk Power Amplifier

Setelah saya mencoba dan mengalami beberapa kali kegagalan akhirnya saya dapat membuat Power Supply Swicthing dari bekas trafo ferit tv dengan hasil yang cukup memuaskan. Awalnya mula saya menginginkan membuat power supply swicthing ini karena harga trafo besi yang cukup mahal. Maka dari itu saya mencoba  membuat power supply dengan harga murah tapi kemampuaannya sama dengan trafo besi biasa bahkan melebihinya dengan biaya yang lebih murah tentunya :). Teman-teman pasti udah gak sabar buat ngikutin langkah-langkahnya..ok langsung saja ke TKP :)...

Disini saya menggunakan Swithcing Power Supply Modul atau yang lebih dikenal dengan GACUN untuk men-drive trafo swicthing. Skematik rangkaian dibawah ini adalah rangakaian Power Supply dengan memanfaatkan Trafo Switching bekas TV namum rangkaian Optocuplernya tidak digunakan, rangkaian ini sudah saya gunakan untuk power supply Power Audio OCL Juga GainClone TDA 7294. Hasilnya sama dengan menggunakan trafo biasa 5A. Jika ingin mendapatkan Arus yang besar tentu mempergunakan Trafo ferit/ Switcing yang besar dan kawat email yang besar atau terdiri dari kawat email kecil yang di gandeng dilillit bareng. Bagi teman-teman yang ingin mencoba silah kan di ikuti tahap-tahap nya.

Skema Rangkaian Power Supply Switching/ Gacun 

Untuk Power Amplifier

Keterangan:

Lilitan Primer adalah 110 lilit dan dibagi jadi dua bagian yaitu:

• P1: 55 lilit. Ø kawat email 0.6mm
• P2: 55 lilit. Ø kawat email 0.6mm

Lilitan Sekunder

• S1: 24 lilit. Ø kawat email 1mm
• S2: 55 lilit. Ø kawat email 0.2mm

Cara membuat lilitan Yang perlu mendapat perhatian dalam melilit ulang adalah lilitan searah jarum jam dan dililit serapi mungkin dan jangan sampai ada yang short. Cara membuat lilitannya adalah sebagai berikut:

1. Buka koker ferite nya dan lilitan aslinya 
2. Buat lilitan baru, dimulai dengan lilitan Primer, P1: 55 lilit. Ø kawat email 0.6mm. Solderlah kawat pada tab yang tersedia dan mulailah melilit sampai itungan yang ke 55 kemudian solderlah ujung penghabisan pada tab yang ada. ingat dan tandai ujung awal liltan tadi, karna ujung itulah nanti yang akan disambungkan langsung ke positive 220v - 300v. 
3. Dilanjutkan membuat liltan Skunder yang pertama, S1: 24 lilit. Ø kawat email 1mm. Liltan sekunder ini untuk mendapatkan tegangan ganda (24v - CT - 24v). Caranya: solderkan ujung kawat pada tab yang ada kemudian buat lilitan sebanyak 12 lilit kemudian solderlkanlah pada tab yang ada (tab ini adalah untuk CT/Centre Tab). kemudian lanjutkan 12 lilitan lagi. Bisa jugan dengan melilit dua buah kawat bareng 12 lilit kemudian ujung akhir kawat pertama di hubungkan dengan ujung awal kawat kedua pertemuan ini dinamakan CT (centre tab) 
4. membuat lilitan untuk rangkaian tambahan, misalnya 12v untuk fan, 15-ct-15 untuk tone control, dll. cara melilit sama tapi gunakanlah kawat halus saja karna arus yang dibutuhkan kecil saja, jadi menggunakan kawat 0.2 saja sudah memadai. Jumlah lilitan nya adalah: 12volt liltannya sebanya 6 lilit. dan untuk rangkaian tone control biasanya dilengkapi dengan IC Regulator 7815 dan 7915 maka tegannya kita buat saja 18v-ct-18v. Untuk mendapatkan tegangan 18v-ct-18v langkanya sama dengan langkah no 3 tapi jumlah lilitannya 9 lilit. 
5. Setelah dirasa cukup dan selesai membuat lilitan Skunder nya, maka ditutup dengan liltan Primer yang kedua (P2: 55 lilit. Ø kawat email 0.6mm). Caranya: Solderlah ujung kawat yang mau dililit pada tab akhir liltan Primer yang pertama tadi, kemudian buat lilitan dengan rapi sebanyak 55 lilit dan solderlah ujungnya pada tab yan tersedia. tandai dan ingat bahwa ujung ini nantinya aka disambungkan ke rangkaian Switching Power Supply Modul pada kabel warna merah 
6. Setiap mendapat satu lapis lilitan, jangan lupa di beri isolasi, atau isolasi yang lama bisa di gunakan lagi. Selesai juga melilitnya..gampangkan :)

Saya gunakan Power Supply Switching ini pada Power Amplifier GainClone TDA7294 Untuk men-drive speaker canon pro 10''. Hasilnya cukup memuaskan, sama seperti menggunakan trafo besi biasa.

Cara buka trafo switching/ ferit switching 

Sumber : dhevir.blogspot.com

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Cara Mudah Melepas Trafo Switching Ferrite

Cara melepas Trafo Switching Ferrite mungkin di antara  teman-teman  ada yang pernah mengalami kesulitan dalam melepas Ferite nya bukan...?? sama... saya juga awalnya begitu, tapi setelah saya mengetahui tip dan triknya mudah sekali melepas ferrite trafo switching tersebut, ga sampai lima menit..Nih tak kasih ilmunya tapi jangan bilang - bilang ya... kalau ada yang tanya suruh aja baca di sini... hehehe... 

 Cara Mudah Melepas Trafo Switching Ferrite

Gini caranya: rebus air sampai mendidih kemudian masukkan trafo  switching yang mau dilepas ferrite-nya kedalam air panas menggelegak tersebut, tunggu beberapa saat kira kira 1 menit, kemudaian ambil trafo menggunakan tang penjepit, jangan tunggu sampai dingin, justru masih dalam kadaan panas inilah kita mudah melepas ferritenya karna parekatnya meleleh. Gunakan alat bantu tang dan obeng tipis untuk menarik ferit. Semoga berhasil…

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Catu Daya Menggunakan Modul Regulator Switching/ Gacun

Ada cara yang bisa dibilang mudah untuk membangun catu daya switching ini karena tidak diperlukan pemasangan komponen per komponen satu demi satu hingga terwujudlah menjadi sebuah rangkaian yang siap pada tahap diuji cobakan. Bagaimana caranya! yaitu hanya tinggal memasang modul regulator switching (Gacun) gitu saja. Bagi yang sering reparsi pesawat televisi pasti sudah familier pada modul regularor switching ini. Ketika regulator TV rusak, cabut semua komponen di bagian input trafo dan pasang modul tersebut. Mari kita terapkan ide ini untuk membuat catu daya switching ala Chief Fara Quin, eh ...ala kita sendiri alias made in sendiri. Wah senang pasti! Akhirnya bisa membuat sendiri Catu daya Switching ini. Suatu kebanggaan karena masih jarang yang bisa merakitnya, sekarang giliran kamu.Berani coba Siapa takut!

Bahan yang diperlukan adalah sebagai berikut:

1. Modul regulator switching/ Gacun
2.  Transformator : Untuk trafo dapat kita menggulungnya sendiri atau trafo dari eks switching  regulator yang telah rusak dan kita manfaatkan trafonya. cara menggulung trafo switching baca di sini
3.  Beberapa komponen pendukung diantaranya; Transistor, Optocoupler, Dioda zener,          Resistor dll.

Skema rangkaian catu daya switching menggunakan 

modul regulator/ gacun

Modul regulator/ gacun

Perakitan

Modul Switching Regulator memiliki tiga kabel output dengan warna Merah. Hitam dan Biru. Trafo Ac matic di bagian Primer memiliki empat kaki dan Sekunder terdapat dua kaki. Sesuai skema gambar kabel warna merah dihubungkan pada kaki trafo Tap tengah ( urutan ke tiga dari kaki trafo yang dapat ground ). Kabel warna hitam dihubungkan pada kutub negatif elko 100uF/400V, dan kabel warna biru pada saklar pengendali optocoupler

Uji Coba
      Untuk uji coba sangat perlu hatii-hati, karena itu lebih baik jangan langsung di hubungkan pada sumber AC 220V, tetapi serilah menggunakan lampu pijar 40 watt, perhatikan nyala lampu dan ukur keluarannya.... sesuai atau tidak...?? normalnya saat tidak di bebani lampu pijar 40 watt tersebut tidak nyala .... 

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Rangkaian Regulator Variable Sederhana

Regulator Variable Sederhana

A simple but less efficient method of controlling a DC voltage is to use a voltage divider and transistor emitter follower configuration. The figure below illustrates using a 1K pot to set the base voltage of a medium power NPN transistor.

Skema Rangkaian Regulator Variable Sederhana

The collector of the NPN feeds the base of a larger PNP power transistor which supplies most of the current to the load. The output voltage will be about 0.7 volts below the voltage of the wiper of the 1K pot so the output can be adjusted from 0 to the full supply voltage minus 0.7 volts. Using two transistors provides a current gain of around 1000 or more so that only a couple milliamps of current is drawn from the voltage divider to supply a couple amps of current at the output.

Note that this circuit is much less efficient than the 555 timer dimmer circuit using a variabe duty cycle switching approach. A fairly large heat sink is required to prevent the PNP power transistor from overheating. The advantage of the circuit is simplicity, and also that it doesn't generate any RF interference as a switching regulator does. The circuit can be used as a voltage regulator if the input voltage remains constant.

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Rangkaian Power Supplay

Electronic devices should be powered by direct current supply DC (direct current) which is stable in order to work properly. The battery or batteries is a source of DC power supply is best. But for applications that require greater power supply, the source of the battery is not enough. Sources of power supply is a source of alternating AC (alternating current) from power plants. This requires a power supply device that can change the AC into DC current.

Rangkaian Power Supplay

Now it should not need another effort to make good pwer supplay you do not need to look for op-amps, transistors and other components, because these circuits are packaged into a single fixed voltage regulator IC. Are now widely recognized as a component of 78XX series fixed positive voltage regulator and the 79XX series is a voltage regulator to remain negative. Even these components are usually already equipped with current limiting (current limiter) and also limiting the temperature (thermal shutdown). This component is only three pins, and by adding some components alone can be a series of power supply regulation was good.

Skema rangkaian power supplay

It's just to note that the IC regulator circuit that can work, the input voltage must be greater than the output voltage regulator. Usually the difference voltage Vin to the recommended VM is in the component datasheet. Usage heatshink (Aluminum cooling) is recommended if these components are used to supply large currents. In the datasheet, these components can pass the maximum current reached 1 A.

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1.25V-15.19V Regulator/Adaptor Variabel Digital

Rangkaian Regulator/Adaptor Variabel Digital

This is a series regulator with variable output from the digital 1.25V to 15.19V The first section of the circuit comprises a digital up-down counter built around IC1, a quad 2-input NAND Schmitt trigger (IC CD4093), followed by IC2, a binary up-down counter (CD4029 IC). Two gates of IC CD4093 are used to generate the up-down logic using the push buttons S1 and S2, respectively, while the other two gates form an oscillator to provide clock pulses to IC2 (CD4029). The frequency of oscillations can be varied by changing the value of capacitor C1 or preset VR1. IC2 receives clock pulses from the oscillator and produces a binary sequential output. As long as its pin 5 is low, the counter continues to count at the rising edge of each clock pulse, but stops counting as soon as its pin 5 is brought to logic 1. Logic 1 at pin 10 makes the counter to count upwards, while logic 0 makes it count downwards. Therefore the counter counts up by closing switch S1 and counts down by closing switch S2. The output of counter IC2 is used to realize a Digitally variable resistor. This section consists of four N / O reed Relays that need just about 5mA current for their operation. (The original circuit containing quad bilateral switch IC 4066 has been replaced by reed Relays switches operated by transistorised because of unreliable operation of the former.)

Skema rangkaian regulator/adaptor variabel digital

The switching action is performed using BC548 transistors. External resistors are connected in parallel with the reed relay contacts. Particular if the relay contacts are opened by the control input at the base of a transistor, the correspond-ing resistor across the relay contacts gets connected to the circuit. The table shows the theoretical output for various combinations of digital inputs. The measured output is nearly equal to the theoretically calculated IC3 outputs across the regulator (LM317).

output of this regulator minimum (1.25V). As count-up switch S1 is pressed, the binary count of IC2 increases and the output starts increasing too. At the highest count output of 1111, the output voltage is 15.19V (assuming the in-circuit resistance of the preset VR2 as zero). Preset VR2 can be used for trimming the output voltage as desired. To decrease the output voltage within the range of 1.25V to 15.2V, count-down switch S2 is to be depressed.

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Rangkaian USB Power Boster (USB Adaptor )

USB Power Boster (USB Adaptor )

USB can be configured for connecting several peripheral devices to a single PC, Since a PC can supply only a limited power to the external devices connected through its USB port, when too many devices are connected simultaneously, there is a possibility of power shortage, Therefore an external power source has to be added to power the external devices. In USB, two different types of connectors are used: type A and type B. The circuit presented here is an addon unit, designed to add more power to a USB supply line (type-A). When power signal from the PC (+5V) is received through socket A, LED1 glows, opto-diac IC1 conducts and TRIAC1 is triggered, resulting in availability of mains supply from the primary of transformer X1.

Skema rangkaian USB power boster (USB adaptor )

Now transformer X1 delivers 12V at its secondary, which is rectified by a bridge rectifier comprising diodes D1 through D4 and filtered by capacitor C2. Regulator 7805 is used to stabilise the rectified DC. Capacitor C3 at the output of the regulator bypasses the ripples present in the rectified DC output. LED1 indicates the status of the USB power booster circuit. Assemble the circuit on a generalpurpose PCB and enclose in a suitable cabinet. Bring out the +5V, ground and data points in the type-A socket. Connect the data cables as assigned in the circuit and the USB power booster is r e a d y t o function.

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Regulator 5 volt Meggunakan IC 7805

Regulator 5 volt IC 7805

The IC 7805 provides circuit designers with an easy way to regulate DC voltages to 5v. Encapsulated in a single chip/package (IC), the 7805 is a positive voltage DC regulator that has only 3 terminals. They are: Input voltage, Ground, Output Voltage.

Skema rangkaian regulator 5 volt

Layout IC 7805

Although the 7805 were primarily designed for a fixed-voltage output (5V), it is indeed possible to use external components in order to obtain DC output voltages of: 5V, 6V, 8V, 9V, 10V, 12V, 15V, 18V, 20V, 24V. Note that the input voltage must, of course, be greater that the required output voltage, so that it can be regulated downwards

Features IC regulator 7805
• Output Current up to 1A
• Output Voltages of 5 Volt
• Thermal Overload Protection
• Short Circuit Protection
• Output Transistor Safe Operating Area Protection

Data max IC 7805
Input Voltage........................................ 35
Thermal Resistance Junction-Cases (TO-220)40......... 5 °C/W
Thermal Resistance Junction-Air (TO-220)............. 65 °C/W
Operating Temperature Range (KA78XX/A/R)............. 0 ~ +125 °C
Storage Temperature Range............................ -65 ~ +150 °C.

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Adaptor 12 volt menggunakan 2n3055

Rangkaian Adaptor 12 volt 2n3055

This adapter circuit can deliver up to 3A at 12V output voltage. The circuit can be employed on occasions when a current of more that 3A is demanded for regulator. IC regulators of such high current rating are pretty hard to find.

The transformer T1 steps down mains voltage, to 12rms & the rectifier bridge D1 rectifies it to produce a DC voltage. The C1 filters the rectifier output and produces a DC level. The series pass transistor Q1 (2N 3055) is biased by resistor R1 (680Ω). Since zener diode D1 is under breakdown region the voltage across it will be 12V. So the total output voltage will be steady 12.7 V(theoretically). That is the zener voltage plus base emitter voltage of Q1.Here transistor Q1 will conduct the excess current required .

Skema rangkaian adaptor 12 volt 2N3055

Notes.

• If 12V zener is not available ,use the nearest value.
• The transformer T1 can be as 23oV primary;15V/5A secondary step down transformer.
• The capacitors must be rated at least 25V.
• By changing the value of the Zener diode, different output voltages can be obtained from the circuit.

The 2N3055 is a silicon Epitaxial-Base Planar NPN transistor mounted in Jedec TO-3 metal
case. It is intended for power switching circuits, series and shunt regulators, output stages and high fidelity amplifiers.

Maximum Ratings

• Collector-Base Voltage 100 V
• Collector-Emitter Voltage (RBE £ 100W) 70 V
• Collector-Emitter Voltage (IB = 0) 60 V
• Emitter-Base Voltage (IC = 0) 7 V
• Collector Current 15 A
• Base Current 7 A
• Total Dissipation at Tc £ 25 oC 115 W
• Storage Temperature -65 to 200 oC
• Operating Junction Temperature 200 oC

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+12Volt|-12Volt Dual Regulator Power Supplay

This is of a dual regulated that provides +12V and -12V from the AC mains. A regulator like this is a very essential tool on the work bench of an electronic hobbyist.

Transformer T1 steps down the AC mains voltage and diodes D1, D2, D3 and D4 does the job of rectification. Capacitors C1 and C2 does of filtering.C3, C4, C7and C8 are decoupling capacitors. IC 7812 and 7912 are used for the purpose of voltage regulation in which the former is a positive 12V regulator and later is a negative 12V regulator. The output of 7812 will be +12V and that of 7912 will be -12V.

Skema rangkaian Dual Regulator Power Supplay

IC regulator 78xx

IC regulator 79xx

Note:

• Use Transformer 15-0-15 V, 1A secondary step-down transformer.
• Capacitor C1,C2,C5 and C6 must be rated 50V or more.

IC regulator 78xx (7812) Description

The LM78XX series of three terminal regulators is available with several fixed output voltages making them useful in a wide range of applications. One of these is local on card regulation, eliminating the distribution problems associated with single point regulation.

Maximum Ratings

• Input Voltage (VO = 5V, 12V and 15V) : 35V
• Operating Temperature Range (TA) : 0°C to +70°C
• Maximum Junction Temperature : 150°C
• Storage Temperature Range −65°C to +150°C
• Lead Temperature (Soldering, 10 sec.)

IC regulator 79xx (7912) Description

The LM79XX series of three-terminal negative regulators are available with several fixed output voltages, making them useful in a wide range of applications. Each type employs internal current limiting, thermal shutdown and safe operating area protection, making it essentially indestructible.


Maximum Ratings

• Input Voltage (VO = -5V, to 15V) : 35V
• Operating Temperature Range (TA) : 0°C to +70°C
• Maximum Junction Temperature : 150°C
• Storage Temperature Range −65°C to +150°C
• Lead Temperature (Soldering, 10 sec.)

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Rangkaian Car Regulator Converter

This is car regulator 12 VDC to 9 VDC converters side for audio, playstation,DVD,etc... The regulator designed for 12DC to 9DC converters that we bring to our design circuit . They are all effective in Switch Mode Power Supplies regulated output. We have developed a series of DC-DC power supply models ranging from 1 watt to 500 watts, which we incorporated into the new controller of DC converters. We are also developing new areas whenever necessary to meet customer requirements. We can provide some custom products that changes on the following products and fully custom DC-DC, new products, such as DC Battery Backup Power Supplies.

Skema rangkaian car regulator converter

Note:
Assemble the circuit on a good quality PCB.
The Q1 ECG184 must be mounted on heat sinks.


list Componet

C1: 1000uf/16v
C2: 100uf/16v
C3: 330nf
R1: 560 ohm, Resistor 1 watt
Z1: 9.1 Volt, diode zener
Q1: EGC184.
.

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Rangkaian +5V Switching regulator

Rangkaian +5V Switching regulator used LM2575-5.0. You can make the stable voltage by using the 3 terminal regulator like LM317. However, because the output electric current and the inputted electric current are the same approximately, the difference between the input electric power (The input voltage x The input electric current) and the output power (The output voltage x The output current) is consumed as the heat with the regulator. Because it is, the efficiency isn’t good. In case of the switching regulator, it inputs only the electric power which is necessary to output from the input by the switching operation. Because it is, there is little electric power to consume with the regulator and it is efficient.

Skema Rangkaian +5V Switching regulator

DC to DC step down voltage regulator. Wide input voltage 8Vdc to 40Vdc.

• LM2575-3.3 (3.3Vdc output)
• LM2575-5.0 (5Vdc output)
• LM2575-12 (12Vdc output)
• LM2575-15 (15Vdc output)
• LM2575-ADJ (1.23Vdc to 37Vdc output)

The switching regulator which introduces in this page is the step down type and is the one to get the output voltage which is lower than the input voltage. As for the regulator which uses this time, the output is 5-V fixation.
The switching regulator of the step up type can be made the voltage which is higher than the input voltage.


Kegunaan IC LM2575

The LM2575 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed-frequency oscillator.

The LM2575 series offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially reduces the size of the heat sink, and in many cases no heat sink is required.

A standard series of inductors optimized for use with the LM2575 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a guaranteed ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50 μA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

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Rangkaian Regulator menggunakan Op-Amp

Regulator is a series of regulations or the voltage output from power so that a portion darinaik effects or voltage drop in net does not affect the voltage ration power to be so stable.


Regular circuit of regulators have been good if the ripple voltage is small, but there is a problem of stability. If the voltage PLN rise /down, then the output voltage is also will be rise /donw. regular circuit of regulators, if the current of the larger, the dc voltage output is also down. For some applications this voltage change will very disrupt.

Rangkaian Regulator menggunakan Op-Amp

Skema rangkaian regulator menggunakan OP-Amp

Technical regulations that better is to use the Op-Amp for a drive-transistor Q. Dioda zener here do not give directly to the bait transistor Q, but as a reference voltage for the Op-Amp IC1. Feedback on the negative pin Op-amp is a snippet from the voltage regulator out, namely:

If the voltage V out exit Ascending, voltage V in (-) also Ascending until this voltage is the same as the reference voltage Vz. Likewise if the voltage V out decreases exit, for example because of supply current to the load increases, Op-amp will maintain stability in the V reference point z with the current IB to the transistor Q1 so that at any time in the Op-amp maintain stability:

Ignore the VBE voltage transistor Q1 and mensubsitusi formula, obtained by mathematical relationships

In the circuit of regulator Op-Amp of this output voltage can be adjusted with the set of R1 and R2.

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Rangkaian Regulator menggunakan Diode Zener

Regulator is a circuit of regulations or the voltage output from a ration resources so that the effects of increased tension or decrease in net does not affect the voltage ration power to be so stable.

Rangkaian Dasar Regulator Diode Zener

Simple circuit regulator , working on the zener breakdown voltage so that it produces the same output with the zener voltage, however, this circuit is only useful if the current burden of not more than 50mA. simple circuit regulator using zener diode can you see in the circuit under the scheme

Skema rangkaian Regulator Dioda Zener dasar

voltage output:
Resistor value

With this design approach, you must check the power ratings of your output resistor and Zener diode to make sure they are able to handle the power requirements.

The power rating load of resistor and zener diode must be at least of they are able to handle
Rangkaian Regulator Zener dengan Transistor

Regulator This is basically the zener regulator is configured with an NPN transistor to produce a large amount of cash. V BE is the base-voltage emitor of the size of the transistor Q1 between 0.2 - 0.7 volt depending on the type of transistor used. By ignoring the current IB flowing in the transistor base, can be counted prisoners of R2 that is needed is:

Skema rangkaian Regulator menggunakan Diode Zener

Iz is a minimum flow required by dioda to reach the zener voltage is zener breakdown. Large currents can be known from the datasheet that the size of the approximately 20 mA

If the required portion of greater flow, calculation of base flow in the IB on the circuit can not be ignored anymore. As is known, large currents IC akan proportionate flow straight to the IB or with the right formula

For such purpose, the transistor Q1 can be replaced with a Darlington tansistor usually have a value of b is quite large. With the Darlington transistor, the base flow of small currents can produce a larger IC

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Variable Adaptor ( 3 , 4 , 5, 9, 12 sampai 37 volt)

Variable Adapter (3 , 4 ,5 ,9 ,12 ,16 ,20 to max 37 volt)

The LM117 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 1.5A over a 1.2V to 37V output range. They are exceptionally easy to use and require only two external resistors to set the output voltage. Further, both line and load regulation are better than standard fixed regulators. Also, the LM117 is packaged in standard transistor packages which are easily mounted and handled.

In addition to higher performance than fixed regulators, the LM117 series offers full overload protection available only in IC's. Included on the chip are current limit, thermal overload protection and safe area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected.

Normally, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors in which case an input bypass is needed. An optional output capacitor can be added to improve transient response. The adjustment terminal can be bypassed to achieve very high ripple rejection ratios which are difficult to achieve with standard 3-terminal regulators.

Besides replacing fixed regulators, the LM117 is useful in a wide variety of other applications. Since the regulator is “floating” and sees only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input to output differential is not exceeded, i.e., avoid short-circuiting the output.

Also, it makes an especially simple adjustable switching regulator, a programmable output regulator, or by connecting a fixed resistor between the adjustment pin and output, the LM117 can be used as a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground which programs the output to 1.2V where most loads draw little current.

For applications requiring greater output current, see LM150 series (3A) and LM138 series (5A) data sheets. For the negative complement, see LM137 series data sheet.

Gamabr skema Rangkaian Adaptor Variable 1.2 - 37 Volt

to set the output you can use the formula below. or with a set 5k VR, the output 1.2 volt anad smallest maximal 25 volt

Features Adjustable Regulator LM117/LM317A/LM317

• Guaranteed 1% output voltage tolerance (LM317A)
• Guaranteed max. 0.01%/V line regulation (LM317A)
• Guaranteed max. 0.3% load regulation (LM117)
• Guaranteed 1.5A output current
• Adjustable output down to 1.2V
• Current limit constant with temperature
• Pa Product Enhancement tested
• 80 dB ripple rejection
• Output is short-circuit protected

Table LM117/LM317A/LM317

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Power supplay (Adapter)

12 volt dual voltage of adapter

• Transformator 18v-CT (min)
• Capasitor 35v
• Bridge Rectifier 2 Ampere /100 v
• c4, c5 Ceramic

12 VOLT 20 Ampere of adapter



Using a single 7812 IC voltage regulator and multiple outboard pass transistors, this power supply can deliver output load currents of up to 20 amps.

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ADAPTOR 12 VOLT 20 AMPERE

Now it should not have to wrestle again seek op-amp, transistor and other components to realize a massive circuit of regulators, because the circuit of this kind have been packed into a fixed voltage regulator IC. Currently, many components known as the 78XX series fixed positive voltage regulator and the 79XX series is a voltage regulator to remain negative.

Even the components are usually already equipped with a flow divider (current limiter) and also the constraint temperature (thermal shutdown). This component is only three pins, and by adding some components can only have a circuit of ration power ter-regulation with either.

For example, 7805 is a voltage regulator to get a 5 volt, 7812 voltage regulator 12 volt, and so on, for example, while the 79XX series is the 7905 and 7912 respectively are negative voltage regulators 5 and 12 volt.

RANGKAIAN ADAPTOR 12 VOLT

The adapter has a set of outputs (output) 12 volt which is teregulasi well. If the components that were installed in accordance with the scheme under the set of the circuit of this adapter safe burdened to 5 ampere, if you want this adapter is able to provide a greater flow you can add a power transistor (2N3055) and replace the bridge diode with diode which has a more ampere high. Exodus circuit of this adapter can be used to run the tape the car, the radio transmitter, CCTV cameras, and other electronics equipment.

Gbr. Skema rangkaian adaptor 12 volt, 5 ampere

List of components adapter 12 volt:

• D1-D4 = 6 A
• D5 = 1 A
• C1 = 4700u/50V
• C2 = 220u/25V
• C3 = 100u/25V
• R1 = 1k
• R2 = 0.2Ohm/5Watt
• F1 = Fuse (skring) 2 A
• F2 = Fuse (skring) 6 A
• IC1 = 7812
• TR1 = 2N3055
• T1 = Trafo 15Volt/5A

Scheme following a circuit of adapter has the ability to supply higher current (20 ampere is reached). For fans radio transmitter (radio station) following a circuit of adapter is suitable to use. Provide a good cooling on the power transistor (MJ 2955) because the transistor will be very hot when the adapter to provide a large flow.

Skema Rangkaian adaptor 12Volt/ 20 ampere

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