Decoder 4 Bit to 16 Line

Decoder 4 bit to 16 line HCC4514B/HCC4515B are monolithic integrated circuits available in 24-lead dual in-line plastic or ceramic package and plastic micro package. The HCC/HCF4514B/4515B consisting of a 4-bit strobed latch and a 4 to 16 line decoder. The latches hold the last input data presented prior to the strobe transition from 1 to 0.Inhibit control allows all outputs to be placed at HCC/HCF4514B/4515B regardless of thestateofthedata or strobe inputs. The decode truth table indicates all combinations of data inputs and appropriate selected outputs.

Decoder 4 Bit to 16 Line HCC4514B/HCC4515B

Absolute maximum rating HCC4514B/HCC4515B decoder 4 bit to 16 line

• Supply Voltage: 0.5 to + 18 V
• Input Voltage: 0.5 to VDD + 0.5 V
• Total Power Dissipation (per package): 100 mW
• Operating Temperature : 40 to + 85 C
• Storage Temperature – 65 to + 150 C

Note:
Stresses above those listed under ”Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections

decoder Logic diagram

truth table IC decoder HCC4514B/HCC4515B

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3 Bit to 8 Line Demultiplexer (Dekoder)

Demultiplexer or decoders are devices that have the function desired output selection is adjusted to a predetermined input. At the decoder if input as an example of three input a1, a2 and a3, then the output will be produced 2 ^ 3 = 8 output (b1, b2, b3, b4, b5, b6, b7 and B8).

In the picture below shows an example in the specification demultiplexer using TTL IC 74HC237

74HC237 demultiplexer Logic diagram

The 74HC237 is a 3-to-8 line demultiplexer with latches at the three address inputs The 74HC237 essentially combines the 3-to-8 decoder function with a 3-bit storage latch. When the latch is enabled (LE = LOW), the 74HC237 acts as a 3-to-8 active LOW decoder. When the latch enable (LE) goes from LOW-to-HIGH, the last data present at the inputs before this transition, is stored in the latches. Further address changes are ignored as long as LE remains HIGH.

The output enable input (E1 and E2) controls the state of the outputs independent of the address inputs or latch operation. All outputs are HIGH unless E1 is LOW and E2 is HIGH.

truth table IC 74HC237 demultiplexer

Pinning IC 74HC237

Quick reference data demultiplexer 74HC237

• supply voltage: 0.5 +7 V
• input diode current: ±20 mA
• output diode current: ±20 mA
• output source or sink current: ±25 mA
• storage temperature: 65 +150 °C
• power dissipation: 750 mW

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USB Audio Interface berbasis DAC PCM2902

Rangkaian USB Audio Interface

This is high quality Preamplifier circuit with built-in USB DAC for my power amplifier Leachamp. Schematics is from datasheet of PCM2902. Circuit includes DAC and ADC, SPDIF output and input and HID part with 3 buttons for MUTE, VOL + and VOL-.

For high quality playback is needed to use an external low-drop voltage stabilizer for the DAC part. DAC is used LP2951CM which was easily available at local stores. Output voltage is set to about 3.7V with two resistors. Circuit board is designed regarding to good ground placement and separating of analog and digital ground. These ground are connected in one point at a USB connector.

Skema Rangkaian USB Audio Interface

In datasheet of PCM2902 is recommended to connect Low Pass Filter to output of DAC for filtering high frequencies above audioband which are produced by oversampling conversion. Integrated circuit includes digital LPF which filters frequency above 100kHz. In application notes for filter on the manufacturer pages are recommended 1st-Order LPF (simple RC) or 2nd-Order with operation amplifiers which works like preamplifier too. I used simple RC LPF with recommended values R 1k and C 4n7. It's better to use roll-type capacitor instead ceramic. I didn't hear difference in a sound between connection with filter or without it, but with respect to other components in a audio chain it is better to use it. For a higher cut-off frequency we can change value of capacitor to 3n3.

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Rangkaian Thermometer Digital

Thermometer Digital

At this thermometer circuit, the sensor (S8100) or diode (1S1588) is used as the thermo sensor. When using the IC thermo sensor, the thermometry to +100°C from -40°C is possible. Also, when using the diode, the measurement to +150°C from -20°C is possible. Both sensors are contained in the kit.

This time, the thermometer circuit used the diode as the thermo sensor to measure more than +100°C. ICL7136 is used for the thermometer and is measuring the change of the forward direction minute voltages of the diode by the temperature. The 3-1/2 digits liquid crystal display (SP521PR) is used for the display. The most significant digit can display only "1".

The consumption electric power of ICL7136 is very small and it is possible to operate about 3 months continuously with the 9-V cell.

Skema rangkaian thermometer digital

Liquid crystal display (LCD) SP521PR Pinning

Specification of LCD SP521PR .

4 digits display
The letter height : 12.7 mm
The maximum applied voltage : 10 V
The operating temperature : -10 to 55°C

Note: When using the 5-V power supply, the resistor as much as 10K-ohm must be put in series to prevent from big electric current's flowing in case of the short circuit.

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GERBANG LOGIKA DASAR

Gerbang Logika|Logic gate is the basic formation of a digital system. Logic gate operate with binary numbers, so that is also called binary logic gate. Voltage used in the logic gate is HIGH or LOW. Voltage 1 means high, while the low voltage means 0.

1. AND logic gate
AND gate is used to generate logic 1 if all inputs have a logic 1, if not it will be generated logic 0

Gambar Gerbang Logika AND

AND truth table

Statement for the Boolean AND Gate
A. B = Y (A and B is the same as the Y)

2. NAND Logic gate (Not AND)

NAND gate will have a 0 output when all inputs to the logic 1. vice versa if there is a logic 0 on any input on the NAND gate, the output value 1.

Gambar Gerbang Logika NAND


NAND truth table


3. Or logic gate
OR gate will output 1 if one of the entries on condition 1. if the desired output value 0, then all entries must be in a state of 0.

Gambar Gerbang Logika OR

Or truth table


4. NOR Logic gate

NOR gate will output 0 if one of the masukannya
condition 1. if the desired output value 1, then all must be in circumstances masukannya 0.

Gambar Gerbang Logika NOR

NOR truth table


5. NOR Logic gate
XOR gate (exclusive OR of the word) will give the output 1 if its input have a different situation.

Gambar Gerbang Logika NOR

XOR Truth Table


5. NOT Logic gate

NOT gate is a gate that has an input and output. NOT gate function as a commutator (inverter), so that the output of this gate is the inverse of its input.

Gambar. Lambang Gerbang Logika NOT

Not truth table

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Memory Digital|Gerbang Logika Fip-Flop (FF)

Flip-flop is Multivibrator families that have two or keadaaan called Bistobil stable Multivibrator. A series of flip-flop has sekuensial because of the nature of the system is set with the hours or credits, the systems are working in sync with the row balance berperiode T called the system clock (System Clock or truncated to CK).

function of a series of flip-flop that is the main memory (store information) 1 bit or a 1 bit storage cells. In addition, flip-flop can also be used on the set of Shift Register, Counter, and a series of others.

TYPE OF FLIP-FlOP
1. RS-FF (the bundle of NAND gate)


Truth table gerbang Logika RS-FF


2. RS - FF with Clock
With the Clock will make a working FF-RS synchronously or active sync

Truth table gerbang Logika RS-FF With Clock


3. FLIP-FLOP D

shortage that occurred in the RS Flip-flop is at the R = 1, S = 1 should be avoided (may not happen). One way to overcome this is to allow only an input only. FF-D is able to resolve the issue.

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Truth table gerbang Logika FLIP-FLOP D


4. FLIP-FLOP JK

Implementation of the gate / JK-FF series and its logic symbol
the picture is as follows:

Truth table gerbang Logika FLIP-FLOP JK

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Rangkaian Kunci Digital Ber-password

LS7220 is a MOS digital lock circuit. When wired to a ten-digitkeypad, the circuit will recognize one four-digit combination out of a possible 5040 combinations. The LS7220 is configured with the features required for an Automotive Ignition Anti-Theft Digital Lock (See Figure 5). These
features include Sense input which enables the IC, Save Memor for Valet Parking, Convenience Delay to maintain Unlock condition for short term interruptions of the Sense input and Save Status and Lock Status outputs which can be used for direct drive of LED indicators.

following simple example the use of LS 7220 as Electronic Combination Lock

Skema Rangkaian Kunci Digital Ber-password

List komponen Electronic Combination Lock

• C1 1uF/25Vr
• C2 220uF/25V
• R1 2.2K
• Q1 2N3904 NPN Transistor 2N2222
• D1 1N4148 Rectifier Diode
• K1 12V SPDT Relay, Any appropriate relay with 12V coil
• U1 LS7220 Digital Lock IC
• S1-S12 PST Momentary Pushbutton
• HD1 12 Position Header

Rangkaian Kunci Digital Ber-password is the circuit diagram of a simple electronic combination lock usingLS 7220. Rangkaian Kunci Digital Ber-password Password Digital can be used to activate a relay for controlling (on & off) any device when a preset combination of 4 digits are pressed.The circuit can be operated from 5V to 12V.

To set the combination connect the appropriate switches to pin 3,4,5 and 6 of the IC through the header.As an example if S1 is connected to pin 3, S2 to pin 4 , S3 to pin 5, S4 to pin 6 of the IC ,the combination will be 1234.This way we can create any 4 digit combinations.Then connect the rest of the switches to pin 2 of IC.This will cause the IC to reset if any invalid key is pressed , and entire key code has to be re entered.

When the correct key combination is pressed the out put ( relay) will be activated for a preset time determined by the capacitor C1.Here it is set to be 6S.Increase C1 to increase on time.

For the key pad, arrange switches in a 3X4 matrix on a PCB.Write the digits on the keys using a marker.Instead of using numbers I wrote some symbols!.The bad guys will be more confused by this.

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