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Projects => VFE Projects => Topic started by: Blue Jinn on July 05, 2020, 12:00:23 AM

Title: White Horse, IC1D pin assignment reversed?
Post by: Blue Jinn on July 05, 2020, 12:00:23 AM
Hello,

On the schematic IC1D, pin 12 should be the (-) input and pin 13 (+) this is reversed. It looks like from the tracing that the input does go to 12 (-) inverting, but then there is positive feedback to produce gain? I'm at a bit of a loss here.

Thanks

Title: Re: White Horse, IC1D pin assignment reversed?
Post by: madbean on July 05, 2020, 12:50:27 AM
For quad op-amps like the TLE2074, TL074, etc:
Pin 12 non-inverted input
Pin 13 inverted input
Pin 14 output

The schem and traces are in agreement with this.
Title: Re: White Horse, IC1D pin assignment reversed?
Post by: Blue Jinn on July 06, 2020, 01:07:39 AM
Holy crap! I have a bad diagram of the TL074 pinout! https://www.brighthubengineering.com/diy-electronics-devices/56253-make-yourself-this-strong-rf-signal-detector-and-go-ghost-hunting/


Is the White Horse inverting on output then?
Title: Re: White Horse, IC1D pin assignment reversed?
Post by: madbean on July 06, 2020, 01:14:57 AM
Yeah, the right side of that diagram is wrong. The inverted input and output pins are always adjacent.

You are correct - the WhiteHorse inverts phase at its output. It's set up this way because of the way the Blend control is designed to mix the clean and compressed signals.
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