Links to VW & Audio Stuff circuit

The meter displays the volume and tone control balance between the left and right stereo amplifiers. For enhanced usability, the meter is designed as a zero-center type. Resistors used in the circuit have a tolerance of five percent or better,...

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,...

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...

Removing the "DC Thump" from Audio Circuits

You may be familiar with this effect. You switch audio equipment such as an amplifier to a different input and there is a loud click or "thump" in the speaker system. Not all equipment is affected. Some high-end audio systems...

Audio Oscillators

This is a resistance-tuned oscillator that operates in three frequency ranges from 35 cycles per second (cps) to 35,000 cps. A significant challenge with resistor/capacitor tuned bridges is maintaining a constant output level across a full decade frequency range. Bill...

Fast Audio Peak Limiter

The circuit devised by Phil Allison still has some input voltage limitations, since it is based on a FET. Junction FET VCAs also create considerable distortion, with the worst of it appearing when the signal is attenuated by 6dB. The...

Amplifier Stages

The XLR or Cannon-type connector is a superior audio connector compared to a 6.5mm jack plug and socket. However, tradition mandates the use of the 6.5mm socket, despite its significant connection issues. Inputs can vary from a single socket directly...

2x22W Car Audio Amplifier Circuit

A 2x22 W car audio amplifier circuit utilizes the TDA1558, a monolithic integrated class-B output power amplifier that includes four 11 W single-ended amplifiers or two 22 W bridge-tied load (BTL) amplifiers. The TDA1558 is designed to drive speakers in automotive...

22w stereo amplifier

This document presents a 22-watt stereo audio power amplifier circuit diagram utilizing the TDA1554 integrated circuit from NXP Semiconductors (formerly Philips Semiconductors). The circuit is designed to effectively amplify stereo signals and is characterized by its simplicity and utility. It...