TDA2030A-amplifier-kit

A reverse-engineered schematic of a cheap eBay TDA2030A audio amp kit. Drawn in Eagle 6.2 back in December 2012, it documents what is actually on the board so you can repair or modify one.

What's on the sheet

• Two TDA2030V channels - stereo, or a bridged mono pair.
• A 4x 1N4004 bridge rectifier.
• Dual 3300uF/25V smoothing caps and a 50K volume pot.
• The Eagle 6.2 file, plus PDF and PNG copies.

The signal path

The signal path is short. AC 9-12V enters and is rectified by four 1N4004s into split rails, then smoothed by 3300uF caps. Audio passes a 50K pot and a 2.2uF coupling cap into the TDA2030V, whose 22K/680 feedback sets the gain. Four 1N4004s as a bridge is a budget move, but fine at this wattage. The board runs stereo or bridged mono.