I found this 3 band single opamp eq
(http://www.zen22142.zen.co.uk/Circuits/Audio/3bandton.gif)
I'm planning to hook it up as a preamp to a power amp and wondering if I can put a gain control here.
There's also a similar eq in page 9 of TL082 datasheet. http://www.national.com/ds/TL/TL082.pdf I would love to put a gain control in both, if possible.
Thanks for any help.
Zener:
Use a dual op-amp. One half is for your EQ. Build a preamp with the other half. You can implement your gain control with a fixed resistor, capacitor and pot in the feedback loop.
Quote from: DavidZener:
Use a dual op-amp. One half is for your EQ. Build a preamp with the other half. You can implement your gain control with a fixed resistor, capacitor and pot in the feedback loop.
Is this a complete one: (of course, minus the gain control)
(http://www.designnotes.com/CIRCUITS/Fc111-3.gif)
So I'll just put a variable resistor between pin1 and pin2 and a cap in parallel, is that right?
Thanks :wink:
More than 60 Million years???
One cave guy found a string.
the other cave guy found a board.
It's all history after that...now there are fully grown men all over tha planet shaking strings on boards, waving the boards around, and going BBwwwwahhhh [sound of guitar power chord 'A'].
That one's a buffer (unity gain). Look for RDV's posting on his "Super Simple Preamp". He's got a schematic there that nails it. That would be your "front half". Your EQ is the "back half". Easily implemented with a NE5532, TL072, etc.