This Kit is designed as a building block in other projects where a battery-powered, variable-gain audio amplifier is required. Up to 2W.

 

A 1W power amplifier building block designed to be part of a larger project needing a low power battery operated amplifier into an 8 ohm speaker.

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A proven & popular power amplifier building block for use in any audio project. Power output is dependent on the supply voltage and load resistance. Over 10W is typical for a 16V supply into a 2 ohm speaker. A 12V supply into a 4 ohm speaker will deliver around 4W. Small heatsink provided. In late 2000 the LM383 was discontinued but the TDA2002 is a direct replacement.

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Using amplifier modules is modern, quick and easy but it teaches nothing about how they work. Here is a Class AB amplifier made from individual components which will deliver several watts of power into an ordinary 8 ohm speaker. Gives hands-on learning about cross-over distortion, bootstrapping, complementary pairs, and push-pull. Detailed explanations given.

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Kit contains the essential components to build a hifi amplifier module using the LM1875 IC. Heatsink, speakers and cables are to be supplied by the user.

LM1875 data sheet

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This stereo amplifier module uses the Samsung KA2209 8-pin IC. This is equivalent to the TDA2822. The circuit is the standard text-book circuit for this chip. No heat sink is required.

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The TDA2009 is a class AB dual Hi-Fi Audio power amplifier monolithic IC designed for quality stereo applications. This is the standard data book application circuit using a minimum of external components. Each channel is capable of delivering 10 watts into 4 ohm speakers using a 24Vdc supply voltage. Dimensions = 79mm x 50mm

TDA2009A Data Sheet

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A simple, low cost stereo VU meter. Two LM3915 dot/bar display driver ICs are used to drive 2 rows of 10 LEDs (14 green, 6 red) in a moving bar display. Each row of LEDs spans a power range of 0-30 dB in ten 3-dB steps. This VU meter indicates "peak music power" when used with audio amplifiers. Ideal add-on for any of the amplifier kits. Dimensions = 65mm x 42mm.

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A simple stereo 3 watt per channel amplifier based on the BA5406 power amplifier monolithic IC. Minimum component count. Runs on 12Vdc power supply. Good general purpose amplifier. Dimensions = 67mm x 38mm. Requires heatsink (supplied.)

BA5406 data sheet

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using the LM380. The IC solders directly to the PCB so no heatsink is required.

General preamplifier. It has a gain greater than 40dB which is enough for most applications. It can also take input from an electret microphone by adding one extra resistor (supplied in the kit.)

Contains all components to make a tone control & pre-amplifier unit. Signal processing is done in the TFS1524A by voltage controller amplifiers and filters. 12V-15VDC supply. Single-sided PCB. Off/on switch in potentiometer.

Uses 2 LM386N-1 for a stereo amplifier. Ideal for Walkman and other battery powered items. 4V - 12V DC.

We spent alot of time getting the tracks right on this single sided PCB to get the lowest possible THD. Getting the separate tracks to the earth pin is the secret.

We tried to do a mono version using the same chip but we could not get the THD to acceptable levels so we cancelled it.