world electronics - Experimental transmissions

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2-Channel, Bridge 19W typ Audio Power Amplifier

Manufacturer: SANYO

Features:

This circuit is a 1 watt mono amplifier using the TDA 7052 from Philips. It is designed

to be used as a building block in other projects where a battery powered audio

amplifier is required to drive a small speaker. It will operate best from 6 – 12 V DC and

requires no heatsink for normal use.

Circuit :

Andy Collinson

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Using a single 7812 IC voltage regulator and multiple outboard pass transistors, this power supply can deliver output load currents of up to 30 amps. The design is shown below:

Overview The circuit was designed to provide an overall gain of one between the output and each input channel on an audio mixer with 3-channel input.
Explanation

A mixer is a device that can be used to merge two or more electronic signals into one complex output. It can have a classification as frequency mixer, electronic mixer, audio mixing console, mode mixer, or vision mixer.

Circuit of a digital volume control using six discrete ICs, including a 5V regulator, is presented. IC1 (555) is configured to function as astable flip-flop. Its frequency or period may be adjusted by proper choice of resistors R44, R45 and capacitor C6 combination. Here it is for 0.3 second period.

Stereo Amplifier with Mute and Stand-by Circuit

 SINGLE SUPPLY

Description : Here is the circuit schematic of a simple audio surveillance system in which the transmitter will pickup sound from one location and the receiver at other location will reproduce it. The receiver and transmitter are connected by only one set of wire. Here both power supply and transmitted signal share the same wire.

Description : This circuit is a simple approach for converting a loud speaker into a microphone. When the sound waves fall on the diaphragm of a speaker, there will be fluctuations in the coil and there will be a small proportional induced voltage. Usually this induced voltage is very low in magnitude and useless. Here in the circuit the low voltage is amplified using transistors to produce a reasonable output. The transistor Q1 is wired in common base mode and produces the required voltage gain.

Description : General Description of the following circuit. This circuit is based around HT–2050 manufactured by HOLTEK semiconductors. It is a low cost, low-power C-MOS LSI designed for lamp andLED flash driver.