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Old 18th May 2012, 09:09 PM   #31
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Cook Your Own Distortion
I'l post this here too, i though it was great to start off with. some op-amp and transistor ideas.
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Old 18th May 2012, 09:37 PM   #32
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cheers

In terms of controls, really just master volume to start with,and probably a treble, mid and bass later. Maybe a gain control eventually.
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Old 18th May 2012, 11:12 PM   #33
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well have you ever seen a typical guitar amp schematic? alot of the tone controls are the same (FMV) with treble mid bass and volume. gain is just a volume control at the start of a circuit. I wouldnt make a pre-amp just with 2 transistors though, personally i prefer an op-amp with diodes as distortion than overdriven transistors. and you have alot more control in terms of frequency response with an op-amp
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Old 18th May 2012, 11:17 PM   #34
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The schematic linked below has a fairly simple descrete power amp. The preamp uses a dual opamp.

http://www.el34world.com/charts/Sche..._3005_5005.pdf
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Old 19th May 2012, 05:41 PM   #35
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Thanks guys
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Old 19th May 2012, 08:52 PM   #36
Simon B is offline Simon B  United Kingdom
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The bottom half of that Marshall schematic, the power amp section, is what you could do with a chip amp. In fact, I think that there are Marshall practice amps that do use such an arrangement.

You can get kits on ebay for a pcb with components for just a couple of quid. They're from china of course, so myself, I'd get another chip from a known good source.
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Old 21st May 2012, 08:46 AM   #37
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Thanks Simon
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Old 27th May 2012, 03:25 PM   #38
Chronus is offline Chronus  United States
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Quote:
Originally Posted by Simon B View Post

?????

Yeah , that's what happens when you are tired. I forgot a schematic to illustrate what I was saying. I have built a number of these 3 or 5 transistor amps. They are all basically the same configuration save for a few mods here and there.

This one is from another forum, but is what I was thinking of at the time except for the single ended power supply which of course simplifies things.

Simple 40 Watt Power Amplifier


Well that certainly saves on tone controls.....

Should have specified radio frequency signals and caps in the pf range. RF could be a problem in any high gain amp.

Not convinced that this is appropriate advice to be offering to this member.
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