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Old 17th September 2010, 08:24 PM   #1
mindmad is offline mindmad  Egypt
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Default Need pre-amp with LM358

hi all

i want pre-amp with tone control with LM358 IC

Can you help me find them

thank's
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Old 17th September 2010, 10:12 PM   #2
mjf is offline mjf  Austria
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hello.
the lm358 is a conventional ic,not really an audio ic................
you can try to use a typ. audio schematic where you swap the ic's to the lm358.
example:tone control
greetings
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Old 18th September 2010, 12:51 AM   #3
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The LM358 is a horrible excuse for an opamp. It has a class B output stage and slow speed, so it has big problems with crossover distortion. Even the much-reviled 4558 would be a better choice than the LM358.
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Old 18th September 2010, 01:33 AM   #4
mindmad is offline mindmad  Egypt
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thanks for replay

can you help me to find stereo tone control circuit
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Old 19th September 2010, 04:56 PM   #5
mindmad is offline mindmad  Egypt
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i found the ic TL072

but i cant found the schemes for stereo and treble & bass control

can any one help me

thanks
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Old 19th September 2010, 05:47 PM   #6
Mooly is offline Mooly  United Kingdom
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mjf showed you one in post #2

Almost any opamp data sheet has a tone control shown as an application... and any opamp will work.

Here's another, perfect for a TL072

Edit... actually the one in post #2 has an error... the opamp inputs are shown incorrectly (reversed).
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Old 19th September 2010, 08:01 PM   #7
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Quote:
Originally Posted by wrenchone View Post
The LM358 is a horrible excuse for an opamp. It has a class B output stage and slow speed, so it has big problems with crossover distortion. Even the much-reviled 4558 would be a better choice than the LM358.
I looked the LM358 up after your comment and I think you were being a bit generous. I think a tin can and string could come close to beating it.

G
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Old 20th September 2010, 01:50 AM   #8
mindmad is offline mindmad  Egypt
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Thank you mooly

but you are send the schemes with LM4562

please can you send it complete like this
Click the image to open in full size.

but with TL072
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Old 20th September 2010, 02:01 AM   #9
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Quote:
Originally Posted by mindmad View Post
Thank you mooly

but you are send the schemes with LM4562

please can you send it complete like this
Click the image to open in full size.

but with TL072
If you build that remember to add the output DC blocking capacitor as the DC on the output should be around 15 volts or you could go to balanced power supplies and remove most of the bias components namely R1, R2, R3, C1, C2 and C5.

G
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Old 20th September 2010, 07:04 AM   #10
Mooly is offline Mooly  United Kingdom
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The circuits are complete... the opamp type makes no difference
You will have to transfer it to a PCB or stripboard and add power suppliers etc... it's all conventional stuff.

Page 7 here from the TL082 data sheet,
http://www.datasheetcatalog.org/data...r/DS008357.PDF

a 3 way tone control.
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