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Old 6th December 2005, 02:18 PM   #1
diyAudio Member
Join Date: Dec 2005
Location: Kortrijk
Question preamp with LM3886 poweramp


I just recently started getting interested in designing a guitar amp... but as anyone i could use some advice... i'm also wondering about some stuff...

Here's my schematic:

Click the image to open in full size.

Here are my questions:
- since i'm running the preamp section on +/-15V i guess i can't use the polar capacitors? (the ones at the output of the clean channel and at the input of the tone control)

- should i connect the gnd from the input with the gnd from the power supply?

thank you for your help...

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Old 6th December 2005, 10:13 PM   #2
Andreq is offline Andreq  Canada
diyAudio Member
Join Date: Nov 2005
Location: Here am I
Hey !!

Im about to do the same as you. Im sure gona build a distortion/overdrive pedal and Building my own EQ + Amp would be nice.

Im not any kind of tech about audio electronic so I can't help.

I just want to tell you that Ill follow your project !

Hope to see more !
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Old 6th December 2005, 11:57 PM   #3
diyAudio Member
Join Date: Dec 2005
Location: Kortrijk

well, i discovered that my schematic has some minor errors in it, i will be adjusting and uploading the new schematic tommorrow if i find the time.
prototyping should be done by the end of the week... since i don't have certain parts now.

anyway, you should know this is my first project and it might as well just fail and cost me a lot of money.
on the other hand so far its already a great learning experience, so i expect to even learn more...

great to know there is some interest in my work.

i also posted all of this at arons forum ( )

many usefull info can be found there too...

keep on rocking!

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