schaller tremolo/ hearthrob tremolo transistors

Frequently asked question on transistors: types, substitutions, how to test, use and misuse them.
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kalamaca
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Joined: 11 Jan 2009, 22:36

Post by kalamaca »

Hi I'm thinking about building this ( viewtopic.php?f=13&t=627)

but I don't have the recomended transistors which are 2N5088's. If I use different ones (I've got AC128s, BC108s, 2N3904s, & 2N3906s) do I have to alter the resistor values for each transister?

I tried breadboarding it from the schematic (http://topopiccione.atspace.com/pjimage ... lo.sch.jpg) using 2n3904s and I'm finding that q3 is getting extremely hot, and I'm not getting any signal past the first transistor? I've tripple checked everything and it all seems in order, but I am still a newbie and probably done something stupid :P

thanks

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