I was doing a request, and this one was so close to the one requested, so i thought i'd draw it up too. Mark has
published this in the past and that one fits easily in B, but the one i'm posting now should be doable even in A... :) This also features a trimmer for nailing the bias just right for your transistors.
It may sound a bit thin to someone's liking, so upping the 4n7 for 10n, 15n or maybe even 22n would give you much more bass responce.
First up, the PNP version (this uses positive ground, so a inverter circuit as a addon, perhaps?):
And the NPN (to be daisy chainable):
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