Pengukur Suara Speaker

Rangkaian Pengukur Suara Speaker

This circuit can be used to setup their home-cinema set adjusting all the loudspeaker outputs to the same level when heard from the listening position. The circuit is very simple (though linear and precise) ac millivoltmeter, using an existing multimeter set to 50 or 100µA fsd with the probes connected to J1 and J2 to read the results.

Skema Rangkaian Pengukur Suara Speaker

List coponent

R1................................... 10K  1/4W Resistor
R2,R3............................... 22K  1/4W Resistors
R4................................... 100K  1/4W Resistor
R5................................... 100R  1/4W Resistor
C1................................... 1µF  63V Polyester or Electrolytic Capacitor
C2................................... 100µF  25V Electrolytic Capacitor
C3................................... 220µF  25V Electrolytic Capacitor
D1-D4............................... BAT46  100V 150mA Schottky-barrier Diodes
IC1................................... CA3140  Op-Amp IC
MIC................................... Miniature electret microphone (See Notes)
J1,J2................................. 4mm  Output sockets
SW1.................................. SPST  Toggle or Slider Switch
B1................................... 9V

The precision of the measure is entirely depending on the frequency response of the microphone used but, fortunately, for the main purpose of this circuit an absolutely flat response is not required. Therefore, a cheap miniature electret microphone can be used.

Note:
Please be careful and set the volume control very low, to avoid loudspeakers' damage. Switch-on the Sound Pressure Level Meter and increase the volume of the amplifier in order to obtain an approximate center-scale reading. Repeat the same steps with all channels.

READMORE...

Rangkaian Loudness Aktif

To get good audio reproduction at different listening levels, a different tone-setting controls should be necessary to suit the well known behavior of the human ear. In fact, the human ear sensitivity varies in a non-linear manner through the entire audible frequency band, as shown by Fletcher-Munson curves.

A simple approach to this problem can be done inserting a circuit in the Preamplifier stage, capable of automatically varying the frequency response of the entire audio chain in respect to the position of the control knob, in order to keep ideal listening conditions under different listening levels .

Fortunately, the human ear is not too critical, so a rather simple circuit can provide a Satisfactory performance through a 40db range.

Skema Rangkaian Loudness Aktif

List Component Of Loudness Aktif

P1______________10K Linear Potentiometer (Dual-gang for stereo)

R1,R6,R8_________100K 1/4W Resistors
R2______________27K 1/4W Resistor
R3,R5____________1K 1/4W Resistors
R4______________1M 1/4W Resistor
R7______________20K 1/2W Trimmer Cermet

C1______________100nF 63V Polyester Capacitor
C2______________47nF 63V Polyester Capacitor
C3______________470nF 63V Polyester Capacitor
C4______________15nF 63V Polyester Capacitor
C5,C9____________1µF 63V Electrolytic or Polyester Capacitors
C6,C8____________47µF 63V Electrolytic Capacitors
C7______________100pF 63V Ceramic Capacitor

IC1_______________TL072 Dual BIFET Op-Amp

SW1________________DPDT Switch (four poles for stereo)

The circuit is shown with SW1 in the "Control-flat" position, ie without the Automatic Loudness Control. In this position the circuit acts as a linear Preamplifier stage, with the voltage gain is set by means of Trimmer R7. Switching SW1 in the opposite position the circuit becomes an Automatic Loudness Control and its frequency response varies in respect to the position of the control knob by the amount shown in the table below. C1 boosts the low frequencies and C4 boosts the higher ones. Maximum boost at low frequencies is limited by R2; R5 do the same at high frequencies.

READMORE...

Rangkaian Diferensiator Op-Amp

Diferensiator circuit functions to produce a voltage which is a function of the time differential input voltage. Diferensiator circuit is basically a pass-filter for condenser consisting of rows and row resistor. Because the condenser reactance increases if the frequency falls, this circuit eliminates the low frequency components of an input. If there is input level applied to diferensiator, voltage on the condenser is changed in an instant so that there is voltage on the resistor decreases exponentially in accordance with the formula
CR is a constant time, ie the product of the resistance capacity. In one time constant, voltage condenser membentangi approximately 63%. It takes nearly 5 time constants to empty the condenser.

Skema Rangkaian Diferensiator Op-Amp

The formula for determining voltage output for the diferensiator is as follows:

Applications for this, besides representing the derivative calculus function inside of an analog computer, include rate-of-change indicators for process instrumentation. One such rate-of-change signal application might be for monitoring (or controlling) the rate of temperature change in a furnace, where too high or too low of a temperature rise rate could be detrimental. The DC voltage produced by the diferensiator circuit could be used to drive a comparator, which would signal an alarm or activate a control if the rate of change exceeded a pre-set level.

READMORE...

Rangkaian Integrator Op-Amp 741

Op-amp is versatile electronic circuits are designed and specially packaged, so that by adding external components at all, can already be used for various purposes. One of them is to make the integrator integrator circuit functions to produce an output voltage which is an integral function of time from the input voltage.

Rangkaianintegrator widely used in the "analog computer" as a tool for solve the integral equation. This circuit can be made by placing capacitors at the input and output reversed and no-reverse input earthed. Input signal given to the input reversed.

Skema Rangkaian Integrator Op-Amp 741

Integrator circuit testing procedures

• Arrange an op-amp integrators as shown in the image above. Supply Power dibua IC 741 can use two batteries or variable DC source.
• Set the input signal from the FG to generate signal box 1 Vp-p on frequency of 1 kHz.
• Use the oscilloscope to view the integrator output response
• Based on the circuit as shown above, you will verify that the output and input will follow the equation

READMORE...

Rangkaian Relay Penunda Speaker

The following is a series of speakers delay relay useful as a delaying the speakers. The purpose of this delay circuit is as a deterrent to prevent pounding of the very first amplifier is turned on.

This delay circuit has the advantage that is: if there konsleting, relationship with the speaker amplifier circuit will be immediately cut off, so that the speaker is safe from fire. waiting time or delay time is about 5 seconds, and can be altered by changing the condenser C2 with elco smaller value. The time needed to re-open relay if the current cut off about 0.5 seconds.

Skema Rangkaian Relay Penunda Speaker

About Relay Contacts


A relay is an electrically operated switch. Electric current through the coil of the relay creates a magnetic field which attracts a lever and changes the switch contacts. The coil current can be on or off so relays have two switch positions

Gambar Relay PWR SPST 16A 24VDC

A simple electromagnetic relay, such as the one taken from a car in the first picture, is an adaptation of an electromagnet. It consists of a coil of wire surrounding a soft iron core, an iron yoke, which provides a low reluctance path for magnetic flux, a movable iron armature, and a set, or sets, of contacts; two in the relay pictured. The armature is hinged to the yoke and mechanically linked to a moving contact or contacts. It is held in place by a spring so that when the relay is de-energised there is an air gap in the magnetic circuit. In this condition, one of the two sets of contacts in the relay pictured is closed, and the other set is open. Other relays may have more or fewer sets of contacts depending on their function. The relay in the picture also has a wire connecting the armature to the yoke. This ensures continuity of the circuit between the moving contacts on the armature, and the circuit track on the Printed Circuit Board (PCB) via the yoke, which is soldered to the PCB.

READMORE...

Rangkaian Pengusir Serangga

In this section of talk about a type of insect repellent, insect repellant is a circuit that will repel insects from your home or yard with effectively. This circuit uses the frequency of bullying for the insect so the insect will go.

Skema Rangkaian Pengusir Serangga

For this skesta insect repellent should be installed inside or outside the home can / for speaker. This series of in-circuit oscilator adl PLL circuit / phase looked loop by using a CMOS 4047 with frequency 22 khz.gunakan external power supply for better results.

IC 4047 Description

The CD4047B is capable of operating in either the monostable or astable mode. It requires an external capacitor (between pins 1 and 3) and an external resistor (between pins 2 and 3) to determine the output pulse width in the monostable mode, and the output frequency in the astable mode.

Absolute Maximum Ratings IC IC 4047

DC Supply Voltage (VDD)...........-0.5V to +18VDC
Input Voltage (VIN)...............-0.5V to VDD +0.5VDC
Storage Temperature Range (TS)....-65°C to +150°C
Power Dissipation (PD)
Dual-In-Line...................... 700 mW
Small Outline..................... 500 mW
Lead Temperature (TL)
(Soldering, 10 seconds)........... 260°C.

READMORE...