Simple Low Power Car Stereo Amplifier

A simple low power car stereo amplifier circuit based on TDA 2003 is shown here. The circuit uses cheap, readily available components and it is very easy to construct. TDA2003 is an integrated car radio amplifier from ST Micro electronics that has a lot of good features like short circuit protection for all pins, thermal over range low harmonic distortion, low cross over distortion etc. 

Circuit diagram :

 A simple low power car stereo amplifier Circuit Diagram

In the circuit given here each TDA2003 is wired as a mono amplifier operating from a 12V supply. Resistors R2 and R3 forms a feedback network that sets the amplifiers gain. C7 is the input DC de-coupling capacitor and C5 couples the speaker to the amplifiers output. C4 is used for improving the ripple rejection while C1 and C2 are employed for power supply filtering. C3 and R1 are used for setting the upper frequency cut-off. Network comprising of C6 and R4 is used for frequency stabilization and to prevent oscillation.

Notes.

• Assemble the circuit on a good quality PCB.
• Heat sinks are necessary for both ICs.
• The circuit can be operated from 12V DC.
• S1 is the ON/OFF switch

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Simple 555 Amplifier

The 555 can be used as an amplifier. It operates very similar to pulse-width modulation. The component values cause the 555 to oscillate at approx 66kHz and the speaker does not respond to this high frequency.  Instead it responds to the average CD value of the modulated output and demonstrates the concept of pulse-width modulation. The chip gets very hot and is only for brief demonstrations.

Simple 555 Amplifier Circuit Diagram

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A Simple Function Generator

Simple triangle-wave generators have a weak point in that the waveform of their output signal normally cannot be modified. The circuit presented here makes it possible to easyly alter the waveform of a linearly rising and steeply trailing saw-tooth sign via a symmetrical triangle-wave to a slowly trailing, steeply rising linear sawtooth. The wanted waveform could additionally be selected impartially of the frequency, which can additionally be varied uniformly from zero.2 Hz to eight kHz. At the same time, an oblong signal with variable responsibility cycle (also unbiased of frequency) is on hand at the rectangular-signal output of the circuit.

 
The circuit consists of integrator IC1b, whose output is applied to comparator IC1c. The output of the comparator is a rectangular signal The output of IC1b is raised through amplifier IC1d to a level that enables the full output voltage vary of the operational amplifier for use. Op amp IC1a provides a secure virtual earth, whose stage is set to 1 of 2 the availability voltage with P1. The easy surroundings of the frequency is made that which you can imagine by means of comments of part of the output of the comparator to the input of the integrator by approach of P2. This preset is regularly now not equipped in usual triangle-wave turbines. Network D1-R1-D2-R2-P3 makes it possible to provide integrator capacitor C3 completely different charging and discharge times.

This association enables the output sign at A1 and the accountability cycle of the rectangular wave signal at A2 to be various. Varying the amplification factor with P5 has no impact on the frequency set with P2. The slope of the signal aspects, the transient responses, and the output voltage range (rail-to-rail or with some voltage drop) depend upon the variety of op amp used. The TL084 used in the prototype offers a just right compromise between worth and assembly the wanted parameters. The circuit is highest constructed on a small piece of prototyping board. The circuit draws a present of no longer more than 12 mA.

Brief parameters:

Provides triangle-wave, sawtooth or rectangular signal
Waveform variable impartially of frequency (triangle wave and sawtooth)
Duty cycle of rectangular sign will be set independently of frequency

Applications:

Test and dimension
Pulse-width control
Summary of preset action:
P1 – units digital earth to a degree equal to Ucc/2;
P2 – units the frequency;
P3– units the waveform;
P4 – units the hysteresis of the comparator (frequency and amplitude of the triangle-wave sign)
P5 – sets the amplification of the triangle-wave and sawtooth alerts.

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Simple Tone Control Circuit with LM301A

This circuit and a simple collection circuit Tone Control. This circuit tone control with surgical Amp LM301A. The JFET 2N3684 feature gives a high input impedance and low noise for UN buffer zone opinion operational amplifier operated EQ sort. Could you see intimately of the circuit following hence as under.

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Simple Inverter with Two Transistors

The series below is a simple inverter circuit that will change the voltage of 12v dc to 220v ac, with use drive transistor 32 as its tip.
Inverter circuit is very simple and easy to assemble and is perfect for just starting to learn to assemble electronic circuits, you can use the transformer 2A to produce about 20 watts output. Do not forget to install coolers in its transistors. good luck.

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Very Simple Peak Indicator Circuit

This series is made to indicate that the amplifier has been given the maximum signal, the amplifier has the ability to be at its peak. if the lights do not mean the signal-plus volume.the way it works is the LED lights will light up when given a signal that more than 1.8 volts, the average amplifier will be saturated (maximum) if the signal was given more than this. 

The circuit is very simple to the point that we forget that making a series of peak signal can in this way. circuit is mounted on the output tone control IC, master mixer output, or input power amplifier. This series does not impose on other circuits.survived the experiment!

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