Mini Audio Amp Top and Bottom Sides
Shown with Quarter
Mini Audio Amp Features and Functions Compact Mini Audio Amp for Fixed Preset Applications
Mini Audio Amp Suggested Wiring
Mini Audio Amp Schematic © 2010 Chuck Carpenter, W5USJ
View/Download Assembly Drawing —
Assembly Drawing PDF
• 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
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.
