Single Ended Guitar Amp Schematic

Is there a good free program for creating this type of amplifier wiring Why do we generally add capacitors in series with ac sources when dc Guitar amp wiring

LM391 Guitar Amplifier Circuit

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Why do we generally add capacitors in series with AC sources when DC

LM391 Guitar Amplifier Circuit

Guitar Amp Wiring

Is there a good free program for creating this type of amplifier wiring