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Old 28th May 2008, 02:26 AM   #1
RTF671 is offline RTF671  United States
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Default First DIY amp attempt!

I have been searching around and figured this is my best bet.

All I have so far is two 40w 10" 8ohms that I some how want to turn into a guitar amp. The details do not matter so much, however I definitely need a volume knob and would prefer some other basic controls like bass and treble. It does not need more than one channel. I want to do this as a learning experience and gateway.

Any advice is greatly appreciated
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Old 28th May 2008, 02:49 AM   #2
MikeW is offline MikeW  United States
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Try project 27 from Elliot sound products.
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Old 28th May 2008, 01:06 PM   #3
RTF671 is offline RTF671  United States
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My speakers cannot take that wattage. So maybe I can use their preamp to attach to a different power amp?
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Old 28th May 2008, 05:27 PM   #4
Minion is offline Minion  Canada
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You speakers should be able to handle it, if you use a slightly lower Rail Voltage it will lower the output power....With both speakers in series (16ohms) it should be able to handle the full 100W and will also run a lot cooler....

you could also just make an amp out of a LM3886/3875 Power amp IC which would be very easy and just add a Good Pedal or preamp curcuit in front of it...

I have 3 Guitar/Bass amp made from a LM3886 and they sound Good and get pretty loud....

Cheers
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Old 29th May 2008, 12:33 AM   #5
RTF671 is offline RTF671  United States
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I am looking at the preamp for esp 27 but I do not understand where high and low come from?
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Old 29th May 2008, 12:52 AM   #6
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your tone controls are C5,6,7, R8, and VR1,2,3. it's a passive tone control.
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Old 29th May 2008, 11:19 AM   #7
RTF671 is offline RTF671  United States
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I know that, I just don't understand how that project has 2 channels in if my guitar has 1 out
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Old 29th May 2008, 11:44 AM   #8
croat47 is offline croat47  United States
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Notice the input resistance values are different on the Hi and Lo jacks for P27.

Many guitar preamps and combo amps have Hi and Low Impedance inputs to match the impedance of the guitar providing the signal.

From the Elliot Sound P27 Text...

"Input - these are quite the opposite of what you might think. The same basic idea is used on Fender amps, as well as nearly all others that have dual inputs for a channel. The Hi input is used for normal (relatively low output) guitar pickups, and is "Hi" gain. "Lo" in this design has about 14 dB less gain, and is intended for high output pickups so the first amplifier stage does not distort. The switching jack on the Hi input means that when a guitar is connected to the Lo input, it forms a voltage divider because the other input is shorted to earth."

Check this out for some more info:

http://www.whirlwindusa.com/tech03.html
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Old 8th June 2008, 02:22 AM   #9
RTF671 is offline RTF671  United States
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One more question, if I were to add a chorus or OD channel would I put it before the preamp?
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