Mini Audio Amp Kit by W5USJ


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Mini Audio Amp Top and Bottom Sides
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MiniAudio Amp by W5USJ



View/Download Assembly Drawing — Assembly Drawing PDF


Mini Audio Amp Features and Functions

Compact Mini Audio Amp for Fixed Preset Applications
• Size is about 2.5cm (1 in.)square by 10mm (3/8 in.) thick
• 2-3/4 inch connection wires included or use your own as needed
• Easily fits into many enclosures — or use "side saddle"
• Power output up to 500 mW depending on supply voltage and load impedance
• Supply voltage 5 to 12 V DC
• Boosts low audio levels from headphones or Piezo buzzers
• Drives a small 8-Ohm speaker with good volume
• 20dB additional gain with optional 10uF gain capacitor (Mouser #647-USR1E100MDD) (RS #272-1025)
• Can be used as a preset amplifier or replace preset trimmer with panel volume control


Mini Audio Amp Suggested Wiring

Mini Audio Amp Wired


Red = supply voltage, Green = audio input, White = audio output, Black, Brown and Gray are ground wires.

Testing
Using clip leads, connect the audio input to an audio source.
Connect the audio output to earphones or a small speaker
Connect power to the supply leads, a 9V battery can be used
Adjust R1 for the desired output level.


Mini Audio Amp Schematic

Mini Audio Amp Schematic




2010 Chuck Carpenter, W5USJ