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Old 19th November 2008, 03:06 PM   #21
jman 31 is offline jman 31  United States
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Am I anywhere close with this? What I did was take a schematic for the LM386 as an amp with bass boost and added the LF353N as a buffer. I really don't understand what every thing does. I am displaying my ignorance of basic curcuitry so please don't laugh if this is nowhere close.

Thanks
Jeremy
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Old 20th November 2008, 11:53 AM   #22
Zigis is offline Zigis  Latvia
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OK, small changes:

remove pot and 10K from input, input jack directly to buffer's pin 3, 1Mohm from pin 3 to ground.
Now you have high impedance (1 Mohm) input buffer.

Between stages - remove 10k resistor, put in this place 10-20K pot, like in original LM386 schematic (you see in datasheet, right?).

BTW, I am not sure you need with bass boost, try simple 20 gain schematic first.

Zigis.
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Old 20th November 2008, 12:26 PM   #23
jman 31 is offline jman 31  United States
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Man, Thank you so much for your feed back!! I made those changes, here they are. I think I understood what you were saying.

What would the value of the bypass cap need to be?
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Old 20th November 2008, 08:18 PM   #24
Zigis is offline Zigis  Latvia
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I see in some schematics 10mf

And don't forget, for LF353 you need +- PS (virtual ground) and for LM386 simple PS.

Maybe more easy way is to build on LF353 only, one channel as input buffer, second as amp with gain 10-15 (Cmoy stile). This is mono, for instrument only.
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Old 20th November 2008, 11:05 PM   #25
jman 31 is offline jman 31  United States
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Quote:
Originally posted by Zigis
I see in some schematics 10mf

And don't forget, for LF353 you need +- PS (virtual ground) and for LM386 simple PS.

Maybe more easy way is to build on LF353 only, one channel as input buffer, second as amp with gain 10-15 (Cmoy stile). This is mono, for instrument only.
Since I don't understand the virtual ground, could you point me to a cmoy style schematic that is based for an instrument that would work with the lLF353? The only ones I can find are for boosting an ipod or cd player. Could I use one of those and just add the buffer? Maybe this one? http://tangentsoft.net/audio/cmoy-tu...angent-sch.pdf
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Old 20th November 2008, 11:29 PM   #26
Zigis is offline Zigis  Latvia
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Yes, you can use schematic you posted, and put before pot your buffer with 1 M input resistor.
With instrument you can bypass C2, there is not DC in guitar's pickup (if you don't use any effect box or pedal ).

Virtual ground in this schematic create two 4.7Kohm resistors R1+ and R1-.
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Old 20th November 2008, 11:48 PM   #27
jman 31 is offline jman 31  United States
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Ok, the ones in the power supply section are the virtual ground? I really appreciate you taking the time to help me by the way Zigis!
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Old 1st December 2008, 08:15 PM   #28
jman 31 is offline jman 31  United States
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OK Here's what I ended up building. Its a variation of a C-moy amp, using half as the buffer and half as the amp. I am getting absolutely nothing. No sound, crackling only silence. I tried with one 9 volt battery and with two. I think all of my soldering is good, but I can't guarantee that my parts are right as I made some of the changes myself.

Here is the schematic that I altered, and a picture of the board as I built it. Thanks for any advice.
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Old 1st December 2008, 08:20 PM   #29
jman 31 is offline jman 31  United States
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heres the layout.
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Old 1st December 2008, 08:27 PM   #30
jman 31 is offline jman 31  United States
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Maybe this one will be better
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