Author Topic: Please Help Me About Dual Supply IC Gyrators  (Read 314 times)

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Agung Kurniawan

Please Help Me About Dual Supply IC Gyrators
« on: January 12, 2017, 04:18:50 AM »
Hi everyone..

I'm planing to build the monster version of my current DIY guitar amp. And I'm going to replace the LA3600 at the end of signal chain with the IC opamp based graphic equalizer.

If I feed the IC with +/-15V. Where should I connect the bias resistor at +in on the opamp gyrators? Ground?
« Last Edit: January 12, 2017, 04:21:16 AM by Agung Kurniawan »
Multiple gain stage followed by some active EQ is delicious.

antonis

Re: Please Help Me About Dual Supply IC Gyrators
« Reply #1 on: January 12, 2017, 04:44:37 AM »
Yes..!!

Agung Kurniawan

Re: Please Help Me About Dual Supply IC Gyrators
« Reply #2 on: January 16, 2017, 11:36:44 PM »
Yes..!!

If I adding a Metal Zone to the amp and feed it +/-15, should I take every +Vb connection to ground?
Multiple gain stage followed by some active EQ is delicious.

TejfolvonDanone

Re: Please Help Me About Dual Supply IC Gyrators
« Reply #3 on: January 17, 2017, 06:01:17 AM »
Most of the time the bias is half way between the two supply to allow the signal to swing in both direction with the same amount of headroom. So if this was the case in the previous build the it should be in the new.
...and have a marvelous day.

antonis

Re: Please Help Me About Dual Supply IC Gyrators
« Reply #4 on: January 17, 2017, 12:45:29 PM »
If I adding a Metal Zone to the amp and feed it +/-15, should I take every +Vb connection to ground?
If it bothers you, leave the Metal Zone as it is and feed it with +9V/GND..

It will work just like an independent pedal...

P.S.
Take care of voltage rating of capacitors connected between Vcc and Vee...
« Last Edit: January 17, 2017, 12:48:32 PM by antonis »

Agung Kurniawan

Re: Please Help Me About Dual Supply IC Gyrators
« Reply #5 on: January 17, 2017, 05:12:44 PM »
Well, I were too lazy to make the +Vb power rail on the pcb :D
Multiple gain stage followed by some active EQ is delicious.