Wiring Diagram

1.25V-15.19V Regulator/Adaptor Variabel Digital, 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 Power amplifier circuit produces output power up to 300 watts ( 8ohms) pada masing-masing channelnya. It is a high fidelity audio power amplifier. Designed for demanding consumer and pro-audio applications. You can also use this circuit with AV receivers, Audiophile power amps, Pro Audio High voltage industrial applications etc

Amplifier output power maybe scaled by changing the supply voltage and number of output devices. The circuit includes thermal shutdown circuitry that activates when the die temperature exceeds 150. CIRCUIT mute function, when activated, mutes the input drive signal and forces the amplifier output to a quiescent state.

The voltage drop across the resistors R2 and R3, are used as the input of the Darlington pairs.
 As the input current to the op-amp depends on the level of the signal op amp is amplifying
the voltage drop across the resistors R2 and R3 will be proportional to the input signal.
These voltage drops are given to the base of Darlington pairs. The amplification is stabilized
as a result of the negative feedback from the junction of collectors of Q2 and Q4.
The theory may seem little awkward for you.But its working good.Such a simple but stable
circuit as this can produce a reasonable output of 12W on a 4 Ohm speaker.

10-Band Graphic Equalizer Circuit Diagram, As shown in the diagram, there are 10 same units that only differ in capacitance values of
capacitors which determine the frequency band of each filter. The potentiometers adjust
the predetermined regions of frequency in each unit.

The components must be high quality and have low tolerance, Specifically potesometer RV1.
the 10 and capacitors. The resistors must be metal-film type.

If it is intended for stereo use then it will be supposed it is made in two pieces with as
much as possible suited the materials, between the channels, so that do not exist differences
in the regulation of each band frequencies.

The amplifier circuit can be run from 3Volt. This Mercury is ideal for battery
operated module. The potentiometer circuit can be used to control volume. Capacitor C1 and C2
are designed to filter supplyvoltage If the battery separator is used as operations offer
source.For using batteries C1 and C2 are not required.

TDA7052 is a mono output amplifier in 8-comng Head DI package (DIP).
The device is designed primarily for battery-operated portable audio circuits.
Features include TDA 7052, no external components needed, no switch-on or switch-off button.

Digital Ammeter is needed to do any kind of electronics circuit making. It is very much useful who is interested in electronics projects. Now-a-days there are many kind of digital or analog ammeter which are found in the market. But if you make such kind of digital meter then you have no no bounds happy.

The bellow circuit is digital Ammeter based on PIC16F684 and ACS712 current sensor. Here the measured ac/dc current will display on three digit 7-segment  with resolution 100mA. In this project current sensor is ACS712ELCTR-30A-T . This circuit can measure the ac or dc current up to 30mA with 66mV/A output sensitivity.

The micro-controller PIC16F684 is used to read analog value from the ACS712 current sensor output and micro-controller convert to current and displaying on 7-segments display. For this circuit all 7-segment displays will be common anode type and it driven by PNP transistor BC557. Originally, this circuit is suitable for measuring DC current.