Amp in a chocolate tin. Using a circuit based on a TDA2003 chip (from Maplin). Supposedly rated at 7w but I'm sceptical - I'm guessing that's transient peak power at full whack, so continous rating at working volume is probably nearer 2 or 3w. The knobs are input volume and gain. Power comes from a 9v battery.
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Glad I could help Mark. What have you modified in the circuit and any chance of seeing the amp in anger?
Hogs.