Schematic Diagrams

Useful schematic and wiring diagrams. ✔ ✔ Enjoy electronic circuits, let your idea comes to hardware

Amplifier Diagrams

Voltage controlled variable gain amplifier

The Voltage controlled variable gain amplifier circuit is built with ic op amp type LM101. The 2N5457 works as a voltage variable resistor having an Rds(on) max of 800 ohms. Because the differential voltage on the LM101 is within the low mV range, the 2N5457 JFET will have linear resistance over several decades of resistance […]

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Voltage Controlled Amplifier

This Voltage Controlled Amplifier circuit is simply an op amp having an additional input at pin 5. A current ILsc is inserted into this input which controls the gain of the device linerly. Thus by inserting an audio signal(±10 mV) within pin 2 and 3 and with controlling the current on pin 5, the amount […]

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Video Amplifier Circuit based IC LM359

This is the simple and easy to build video amplifier circuit based IC LM359. The LM359 is a Dual, high speed, programmable and Current Mode (Norton) amplifier chip which can be used for general purpose video amplifiers. Parts List R1=1Kohm R2-3=12Kohm R4-5-6=10Kohm C1=10nF 100V C2-6=100uF 25V C3=100nF 100V C4=1pF ceramic C5=10nF 100V C6=100uF 25V IC1=LM359N […]

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Variable Gain Amplifier controlled by voltage

This is Variable Gain Amplifier controlled by voltage circuit function as video amplifier, it use 3 Field Effect Transistor (FET) type U1897E. U1897E  FET can also be replaced with a 2N4091. The tee attenuator provides for optimum dynamic linear range attenuation up to 100 dB, even at frequency = 10.7 MHz with proper layout. Most […]

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Two way 20 watts audio amplifier

This is a 20 watts audio amplifier is supplied with a voltage 14.4 volts, giving a total power of 20 watts into two different channels, each of which is connected to the tweeter and a woofer. This amplifier is therefore equipped with an active CROSSOVER  filter with a crossover frequency of 2 KHz. Each loudspeaker must support a power of 10 watts and have an impedance of 4 ohms. The supply voltage can be between 12 and up to 15 volts. This two way amplifier can also be beneficially used as a BOOSTER for 2 way radio. In this case, it is […]

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TDA2050 Amplifier with Current Environmental Protection

Here the TDA2050 amplifier with current environmental protection. In this scheme, there is a current environmental protection: the signal from the output passes through the connecting cables and chains of the column (in this case takes into account the reactance of the circuit section of the 4th pin of the chip to R3), then the […]

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Subwoofer Amplifier for Computer

An integral part of modern multimedia computer is the presence of two active audio speakers (mounted on a monitor or set next to it). Due to a number of physical limitations of the two small computer speakers can not achieve a good reproduction of the full range of sound frequencies. Especially collapses and distorted bass. […]

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Stereo Pre-amplifier + Tone Control Circuit based TDA1524A

This is the circuit diagram of stereo preamplifier which built based a compact IC TDA1524A. Tone control circuit module is included in this preamplifier circuit, so you can connect the output channels directly to stereo power audio amplifier circuit. Components List R1, R2 = 220R R3, R4 = 4K7 R5 = 2K2 R6 = 1K […]

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1.4W Stereo Power Amplifier Circuit based TDA8552

A few more words on the chip. This is a bridge amplifier class AB integrated into the protection against overheating, short circuit protected outputs, suppression of inrush current when you turn on and off the amplifier. The only difference – a little more power output – 1.4 watts per channel. But nevertheless, it also does […]

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Small stereo headphone amplifier

A small stereo headphone amplifier cheap and very nice features (without HIFI). It only uses a single power supply value between 15 V and 24 V (you can even lower up to 12 V, but with a less backup). The total gain is determined by the ratio of resistors R102 / R101 for the left […]

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