Quick Q - This Amp Will Work ? (very Smple Amp)

Dj BASS AMP · 14th July 2004, 11:25 PM

this simple amp will work with no problams?

and if need to change some thing......?! to make him work (if not).

thanks tamir.

markp · 14th July 2004, 11:29 PM

At the very least change the resistor and cap on the output to ground from 10 ohm/100uF to 4.7 ohm and .1uF.

Nelson Pass · 15th July 2004, 12:57 AM

It will work, more or less, but since the 2nd op amp ids driving
a follower stage, the output voltage will be slightly less than
that of the op amp, and since the op amp has only +/- 15 volt
rails, you're only going to use maybe 14 volts of the 40 volt
rails on the output stage.

fab · 15th July 2004, 04:10 AM

-The first unity gain opamp IC1a has no purpose since the 2nd opamp is sufficent. Connect junction of 1k and 10k inputs resistors to pin 5 of NE5532.

- the 1n4148 diodes are not polarized (reversed biased).

- To get a higher output voltage swing (close to 40v) as pointed out by Nelson while using an opamp for input, you must use an output stage with gain. See the following post :
http://www.diyaudio.com/forums/showt...308#post359308 .
But, of course, this referenced circuit uses mosfet power transistors but the principle for gain is the same for bjt (except that the gain value is different).

Fab

Dj BASS AMP · 15th July 2004, 06:10 AM

Quote:

Originally posted by markp
At the very least change the resistor and cap on the output to ground from 10 ohm/100uF to 4.7 ohm and .1uF.

OK Thank i will do this.

Quote:

Originally posted by Nelson Pass
It will work, more or less, but since the 2nd op amp ids driving
a follower stage, the output voltage will be slightly less than
that of the op amp, and since the op amp has only +/- 15 volt
rails, you're only going to use maybe 14 volts of the 40 volt
rails on the output stage.

so i need to put one more NE5322 for the input to get more gain?!

Quote:

Originally posted by fab
-The first unity gain opamp IC1a has no purpose since the 2nd opamp is sufficent. Connect junction of 1k and 10k inputs resistors to pin 5 of NE5532.

- the 1n4148 diodes are not polarized (reversed biased).

- To get a higher output voltage swing (close to 40v) as pointed out by Nelson while using an opamp for input, you must use an output stage with gain. See the following post :
http://www.diyaudio.com/forums/showt...308#post359308 .
But, of course, this referenced circuit uses mosfet power transistors but the principle for gain is the same for bjt (except that the gain value is different).

Fab

i dont understand what u say about the diodes and the out put.
i have to use in 2sc5200/1943.......

thanks tamir

Dj BASS AMP · 15th July 2004, 01:24 PM

Quote:

Originally posted by fab
-The first unity gain opamp IC1a has no purpose since the 2nd opamp is sufficent. Connect junction of 1k and 10k inputs resistors to pin 5 of NE5532.

- the 1n4148 diodes are not polarized (reversed biased).

- To get a higher output voltage swing (close to 40v) as pointed out by Nelson while using an opamp for input, you must use an output stage with gain. See the following post :
http://www.diyaudio.com/forums/showt...308#post359308 .
But, of course, this referenced circuit uses mosfet power transistors but the principle for gain is the same for bjt (except that the gain value is different).

Fab

hii !

sorry dont look on the last massege....

my new Q' is...: how i build the output with gain? u can make it for me on my design...?! because the pic in the link is not clear and i do not see the difference.....

tamir

sajti · 15th July 2004, 01:56 PM

Hi DJ,

the output stage with gain something like this:
http://www.diyaudio.com/forums/attac...&postid=236190

sajti

li_gangyi · 15th July 2004, 02:17 PM

a Lynx amp is also based on an opamp inpiut stage...so is the PA600 that I saw sometime around here...do a quick search...

fab · 15th July 2004, 03:25 PM

Quote:

Originally posted by Dj BASS AMP

hii !

sorry dont look on the last massege....

my new Q' is...: how i build the output with gain? u can make it for me on my design...?! because the pic in the link is not clear and i do not see the difference.....

tamir

Dj,

You can refer to sajti posted circuit for output stage with gain -especially if you want to use BJT output transistors instead of mosfets.

Good luck

Fab

Dj BASS AMP · 15th July 2004, 05:25 PM

soo..... it is make the amp more complicated.....

OK thanks to All.
Tamir

14th July 2004, 11:29 PM	#2
markp diyAudio Member Join Date: Oct 2003 Location: L.A., CA	At the very least change the resistor and cap on the output to ground from 10 ohm/100uF to 4.7 ohm and .1uF. __________________ If it sounds good... it is good!

15th July 2004, 02:17 PM	#8
li_gangyi diyAudio Member Join Date: Jun 2003 Location: Woodlands Circle	a Lynx amp is also based on an opamp inpiut stage...so is the PA600 that I saw sometime around here...do a quick search... __________________ Kids in the back seat cause accidents...Accidents in the back seat cause kids...

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15th July 2004, 12:57 AM	#3
Nelson Pass The one and only Join Date: Mar 2001	It will work, more or less, but since the 2nd op amp ids driving a follower stage, the output voltage will be slightly less than that of the op amp, and since the op amp has only +/- 15 volt rails, you're only going to use maybe 14 volts of the 40 volt rails on the output stage.

15th July 2004, 04:10 AM	#4
fab diyAudio Member Join Date: Mar 2004 Location: Canada	-The first unity gain opamp IC1a has no purpose since the 2nd opamp is sufficent. Connect junction of 1k and 10k inputs resistors to pin 5 of NE5532. - the 1n4148 diodes are not polarized (reversed biased). - To get a higher output voltage swing (close to 40v) as pointed out by Nelson while using an opamp for input, you must use an output stage with gain. See the following post : http://www.diyaudio.com/forums/showt...308#post359308 . But, of course, this referenced circuit uses mosfet power transistors but the principle for gain is the same for bjt (except that the gain value is different). Fab

15th July 2004, 01:56 PM	#7
sajti diyAudio Member Join Date: Apr 2003 Location: Vác, Hungary	Hi DJ, the output stage with gain something like this: http://www.diyaudio.com/forums/attac...&postid=236190 sajti

15th July 2004, 05:25 PM	#10
Dj BASS AMP Account Disabled Join Date: Jul 2002	soo..... it is make the amp more complicated..... OK thanks to All. Tamir

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