The circuit below shows a 4-transistor utility amplifier suitable for a variety of projects including receivers, intercoms, microphones, telephone pick-up coils, and general audio monitoring. The ...

This miniature audio amplifier delivers up to 250mW and can be used like a final stage audio amplifier for radio sets. The schematic is very simple: one BC547 transistor controls a balanced power ...

In Audio Amplifier Systems, most of the time, the load used is a Loud Speaker. Load impedance plays an important role in the output of the power amplifier. So, a proper load must be selected while ...

This hf circuit theory can be used to identify spurious resonances or oscillations in feedback amplifier and discrete transistor circuits, such as photodiode-input trans-resistance op-amps or emitter ...

This amplifier circuit amplifies audio signals up to 100 watts, suitable for use in high-power audio systems. The circuit includes several stages: an input stage for signal conditioning, a ...

This repository has reverse-engineered schematics for the AMP-MGB (IR3R53) audio amplifier chip used in the Game Boy Color. My blog post has more details and discussion of the chip. I generated these ...

This simple circuit has helped me out on many occasions. It is able to check transistors, in the circuit, down to 40 ohms across the collector-base or base-emitter junctions. It can also check the ...

Some common components that are used in audio circuits are resistors, capacitors, inductors, transistors, diodes, op-amps, filters, amplifiers, and speakers.

A novel design technique for closed-loop amplifier circuits, suited to very low supply voltages, is proposed. It is based on the use of quasi-floating gate MOS transistors, thus avoiding issues ...

In this letter, we report on the development of high-gain WR-1.5 amplifier circuits, utilizing a transferred-substrate InGaAs-on-insulator (InGaAs-OI) high-electron-mobility transistor (HEMT) ...