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Old 15th July 2004, 12:25 AM   #1
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Question Quick Q - This Amp Will Work ? (very Smple Amp)

this simple amp will work with no problams?

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

thanks tamir.
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Old 15th July 2004, 12:29 AM   #2
markp is offline markp  United States
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At the very least change the resistor and cap on the output to ground from 10 ohm/100uF to 4.7 ohm and .1uF.
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Old 15th July 2004, 01:57 AM   #3
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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.
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Old 15th July 2004, 05:10 AM   #4
fab is offline fab  Canada
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-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
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Old 15th July 2004, 07:10 AM   #5
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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
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Old 15th July 2004, 02:24 PM   #6
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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
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Old 15th July 2004, 02:56 PM   #7
sajti is online now sajti  Hungary
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Hi DJ,

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

sajti
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Old 15th July 2004, 03:17 PM   #8
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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...
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Old 15th July 2004, 04:25 PM   #9
fab is offline fab  Canada
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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
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Old 15th July 2004, 06:25 PM   #10
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soo..... it is make the amp more complicated.....

OK thanks to All.
Tamir
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