The TDA7052 1W audio amp chip has two output pins that connect directly to the speaker. The circuit text say "Do not ground either speaker terminal". I'd like to connect the output though to a PC soundcard line-in, which is single ended. Is therean an easy way to do this? I don't want to use a transformer (as I don't have one!). Can I do this with some RC network/series capacitors? thanks
You don't need a transformer, just a small capacitor (1 to 10 uF would be OK) and resistor around 10K ohms (up to 100K would be OK) preferably the same values for both channels. Use output 1 only to the '+' terminal of one of the caps. Other end of the cap is the output. Connect the resistor to the output and ground. That goes to your line in. What you're doing here is ignoring the '-' phase of the output and using only the '+' with a DC blocking cap and a resistor to provide a charging path for the cap. This way it won't make a pop when you plug into the computer. This stunt is done very often when connecting a balanced audio source to a consumer unbalanced input though the cap and resistor isn't needed because there is no DC to deal with. You lose 6 db from reference level which is about right for consumer gear. GG
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