Solid state 100W guitar amp

darkfenriz · 18th July 2004, 02:41 PM

hi men
I still need help about my project since I'm going to pit it into reality.
is this gonna sound good??
how to enhance this?
any suggestions welcome...

Centauri · 19th July 2004, 12:16 PM

...........think this needs to go back to drawing board...

As there is no closed DC path through this circuit, the output of the first opamp will latch to one of the supply rails and won't function. The output will have a large DC offset and probably draw large amounts of current.

Are you trying to convert a tube push-pull to solid state??

Cheers

darkfenriz · 19th July 2004, 03:11 PM

yeah centauri

you've got the point here...
d'you think putting 100k resistors in paralel to caps will solve this problem ???

help needed

cheers

gallow's bird · 8th April 2006, 09:10 AM

hi, i've built the 100W amp from elliot sound product
but i'm using my own PCB design. the problem is that
the output from the power amp circuit tend to draw a
large amounts of current. can you help solve this problem
or do you know someone that expert in this field.
i've attached the layout of the PCB in the attachment. can you give me your e-mail address. my e-mail address is sovtek_svetlana@yahoo.com.
another thing, what is meant by closed DC path?

joecool85 · 19th April 2006, 10:48 PM

I don't know exactly how to help you, but I know that there are several guys at ssguitar.com that should be able to help with your problem pretty easy.

dgaxeman · 3rd May 2006, 10:55 PM

first off i think the minus input of the 1st op amp should not connect to the speaker outs. 2nd the input impedance is too low for guitar the 22k to grd s/b 100k to prevent loading the pickups.
i would use a quad op amp and the first stage would be a buffer.
3rd you have no tone or gain controls . install a duel 10 to 100k pot in the feedback loop of the 2nd stages replacing the 4k7 resistors. this will give some gain control.

infinia · 3rd May 2006, 11:21 PM

Why don't you use a pnp on lower driver?

8th April 2006, 09:10 AM	#4
gallow's bird diyAudio Member Join Date: Apr 2006 Location: diy valley	100W guitar amp from elliot sound product hi, i've built the 100W amp from elliot sound product but i'm using my own PCB design. the problem is that the output from the power amp circuit tend to draw a large amounts of current. can you help solve this problem or do you know someone that expert in this field. i've attached the layout of the PCB in the attachment. can you give me your e-mail address. my e-mail address is sovtek_svetlana@yahoo.com. another thing, what is meant by closed DC path?

19th April 2006, 10:48 PM	#5
joecool85 diyAudio Member Join Date: Jan 2006 Location: Maine	I don't know exactly how to help you, but I know that there are several guys at ssguitar.com that should be able to help with your problem pretty easy. __________________ Life is what you make it. http://www.ssguitar.com

3rd May 2006, 11:21 PM	#7
infinia diyAudio Member Join Date: May 2005 Location: Californication	Why don't you use a pnp on lower driver? __________________ like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust

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19th July 2004, 12:16 PM	#2
Centauri diyAudio Member Join Date: Jul 2003 Location: Newcastle, Australia	...........think this needs to go back to drawing board... As there is no closed DC path through this circuit, the output of the first opamp will latch to one of the supply rails and won't function. The output will have a large DC offset and probably draw large amounts of current. Are you trying to convert a tube push-pull to solid state?? Cheers

19th July 2004, 03:11 PM	#3
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	yeah centauri you've got the point here... d'you think putting 100k resistors in paralel to caps will solve this problem ??? help needed cheers

3rd May 2006, 10:55 PM	#6
dgaxeman diyAudio Member Join Date: Feb 2006 Location: usa	first off i think the minus input of the 1st op amp should not connect to the speaker outs. 2nd the input impedance is too low for guitar the 22k to grd s/b 100k to prevent loading the pickups. i would use a quad op amp and the first stage would be a buffer. 3rd you have no tone or gain controls . install a duel 10 to 100k pot in the feedback loop of the 2nd stages replacing the 4k7 resistors. this will give some gain control.

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