Signal Tracer and Injectors circuit

This circuit is a low-noise audio preamplifier that utilizes one FET and one BJT. The audio signal to be amplified is connected to the base of FET Q1 through capacitor C1 and resistor R3. The base of transistor Q2 is...

Small Discrete Audio Power Amplifier

This is a small audio amplifier, similar to those used in small transistor radios. The circuit draws approximately 30 milliamps from a 9-volt supply and consists of two stages. The first stage is the input stage using a 2N3053 transistor,...

Super Fool power amplifier module

The D amplifier utilizes a series fool manifold and can easily be configured as a mono output transformerless (OTL) or output capacitorless (OCL) audio power amplifier. Figure 3-12 illustrates a single-channel power output typical application wiring diagram for OTL. Figure...

Audio Oscillator Ii

The circuit's frequency oscillation is given by the formula f = 2.8 / [Cix(i1 + i2)]. By utilizing the specified values, the output frequency can be adjusted from 60 Hz to 20 kHz by rotating potentiometer R2. A portion of...

Audio Amplifiers

The first choice is usually an integrated circuit designed for the purpose. A typical assortment can be seen on this National Semiconductor page. Discrete designs can also be built with readily available transistors or op-amps, and many designs are featured...

1 KHz Audio Oscillator schematic

This circuit consists of a CMOS square wave oscillator on a frequency of approximately 1 kHz. The RC filter, which has a roll-off frequency of 500 Hz, filters the harmonics, providing a sine-wave output. The described circuit features a CMOS...

Simple Audio Test Oscillator Circuit

An 88 mH surplus telephone toroidal coil is utilized in a 1 kHz oscillator. It can provide up to 8 V peak-to-peak into a high-impedance load. The total harmonic distortion (THD) is 0.9%. The circuit employs an 88 mH toroidal coil,...

Audio Graphic Equaliser

Cleaned Input: Description: Audio graphic equalizers are very common as commercial products (for Hi-fi, car audio and stage use) but circuits for them are very rarely published. I didn't design this one but it's really very simple. The details shown...

2 X 22 Watt Stereo Amplifier Circuit using IC TDA 1554

A high-quality stereo amplifier circuit of 44 Watts (22 Watts per channel) using the TDA 1554 IC. This is a powerful audio amplifier circuit for 2 channels. The described stereo amplifier circuit utilizes the TDA 1554 integrated circuit (IC), which is...