200w Audio Amplifier
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2W audio power amplifier LM380 circuit
This document details a 2W audio power amplifier circuit that utilizes a 14-pin LM380 package as the amplification element. The input signal is managed by a volume control potentiometer (Rp) rated at 20k ohms, with a coupling capacitance of 22...
Audio Power Limiter
The gain control element is a Light Dependent Resistor (LDR). These are blessed with a few very useful features for our purposes, one of which is low distortion even at quite high signal levels. Being light activated, all we need...
Stereo balance indicator
This is one of the simplest stereo balance indicator circuits available. The circuit provides a visual indication using two LEDs, which represent the difference in balance between the left and right channels of a stereo system. It is based on...
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 Circuit Output Relay Delay Audio
This is a simple circuit designed for an audio amplifier project to control the speaker output relay. The purpose of this circuit is to manage the relay that activates the speaker output in the audio amplifier. The circuit is designed...
Power Amlifier 40W Class A circuit
This is an audio power amplifier that delivers 40 W at 8 ohms in Class A operation. The power transistors are continuously active, enabling a substantial current to flow.
The audio power amplifier described operates in Class A mode, which is...
Audio Memo Alert Circuit
This device prevents paper notes and memos from being overlooked. A paper note placed between two fingers made of a conducting material (metal or conductive plastic) breaks the circuit, allowing pair 1 of Ul-a to go high. This causes Ul-c...
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...
5W-150mhz-amplifier
This circuit employs the MRF123 TMOS power FET. The MRF134 is a high-gain FET that may exhibit instability at both VHF and UHF frequencies. A 68-ohm input loading resistor has been used to improve stability. This amplifier achieves a gain...