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Old 14th December 2006, 02:12 AM   #1
b0nk3rs is offline b0nk3rs  Philippines
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Unhappy Need Preamp with Volume Control ASAP!

Hi! I'm new here and my group is required to build a Tone Control Circuit... a preamp with volume controls. It should run at 30V, uses an opamp, and has bass, treble, mid range, and volume controls... can anyone provide me with a schematic diagram?
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Old 14th December 2006, 03:24 AM   #2
Minion is offline Minion  Canada
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Try this:

http://www.generalguitargadgets.com/...cticemaneq.gif

It Can be modified to run off of +/-15v...The 5k resistor at the bottom right is a 5k Pot with the output being the wiper of the Pot, This pot controlls Volume...You might want to put a buffer before this circuit though, You can just use a Dual Opamp with half of it used as the buffer and the other half used in the EQ circuit....You can use any number of audio opamps here...


Cheers
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Old 14th December 2006, 08:12 AM   #3
roger-k is offline roger-k  Norway
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What about this:
http://sound.westhost.com/project97.htm
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Old 14th December 2006, 07:55 PM   #4
b0nk3rs is offline b0nk3rs  Philippines
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hey minion...i'm a bit new with electronics... could you show me a schematic diagram of the new circuit with the pot for volume in it? thanks!
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Old 14th December 2006, 07:55 PM   #5
b0nk3rs is offline b0nk3rs  Philippines
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ei roger... the circuit doesn't have controls for mid range
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Old 14th December 2006, 10:03 PM   #6
roger-k is offline roger-k  Norway
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I came across this (It has no volumecontrol):
http://www.runoffgroove.com/tonemender.html
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Old 14th December 2006, 10:14 PM   #7
jpg is offline jpg  Germany
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Quote:
the circuit doesn't have controls for mid range
Hi b0nk3rs,

what can a midrange control do for you that bass and treble control can't?
To attenuate the mids, turn up bass and treble; to boost the mids, attenuate
bass and treble. I guess that's why a midrange control is so rarely seen on hifi amps.

jpg
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Old 14th December 2006, 10:36 PM   #8
Minion is offline Minion  Canada
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Quote:
Originally posted by b0nk3rs
hey minion...i'm a bit new with electronics... could you show me a schematic diagram of the new circuit with the pot for volume in it? thanks!

That schematic does have the Volume pot...It is the 5k one at the Very bottom right...It just doesn"t say Volume in the schematic but that is what it is.....

It is basicly just a 5k Pot with the wiper of the Pot being the Output and the 3rd pin of the pot tied to ground......

I"m useing this Very circuit (with a Buffer and an extra Gain stage) for a preamp for a Guitar amp I have been working on 4 Ever.....
It is a pretty easy circuit and I was able to design the PCB with the Buffer and extra Gain stage in just a couple hours.....


Good Luck


PS: what type of Group is it that you are in that makes you Build a Preamp with Tone controlls??
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Old 15th December 2006, 07:09 AM   #9
b0nk3rs is offline b0nk3rs  Philippines
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ei jpg... i really don't know much but our teacher required us to build a tone control that has a midrange control. Guess I can't do anything about it...
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Old 15th December 2006, 07:09 AM   #10
b0nk3rs is offline b0nk3rs  Philippines
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hey minion, if I were to include a "line in" provision, where shall I place it? beside the 1 micro farad capacitor?
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