This Is a circuit I designed that allows you to select from multiple clipping options and arrangements for use in guitar Overdrive/Distortion pedals that utilize Op-Amps in their gain stage. There are 4 connections on this circuit. VCC, Ground, Op-amp output pin, Op-amp Inverting Input pin.

 

You'll get plenty of very-rude Pops and Clicks from all those Relays and Switches.

Never mechanically switch anything in the Feedback-Loop of an Op-Amp, never.

What is your question ?
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You'll get plenty of very-rude Pops and Clicks from all those Relays and Switches.

Never mechanically switch anything in the Feedback-Loop of an Op-Amp, never.

What is your question ?
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There is no question. And mechanical switching of clipping diodes in the feedback loop is very common in overdrive pedal design. As long as it's done when the circuit is not actively powered and in the signal path. Was merely trying to share the design

 

This Is a circuit I designed that allows you to select from multiple clipping options and arrangements for use in guitar Overdrive/Distortion pedals that utilize Op-Amps in their gain stage. There are 4 connections on this circuit. VCC, Ground, Op-amp output pin, Op-amp Inverting Input pin.

nice.
Next level to achieve with the design is changing the relay contacts to JFETs.

 

Substituting a CMOS analog switch such as the quad CD4066 for the relays would lower the cost, increase the reliability, and use much less power.
Relays for this purpose are really old technology, and have no particular advantage.

 

When I was young I hated to hear pops and clicks from relays and vinyl records and hated to hear any amount of distortion.
Now I am almost 79 years old with "normal for my age" high frequencies hearing loss and I can barely hear those noises without my hearing aids.

Overdrive/Distortion noise makes a guitar sound like a buzzer and were used many years ago when the guitar was played on a muffled-sounding AM radio.

 

Substituting a CMOS analog switch such as the quad CD4066 for the relays would lower the cost, increase the reliability, and use much less power.
Relays for this purpose are really old technology, and have no particular advantage.

typically ICs like NLAS4684 are used and sometimes people use 2n7000 if they really want to build it cheaply.

 

sometimes people use 2n7000 if they really want to build it cheaply.

Doubt that four 2N7000's are cheaper than one CD4066.

 

Doubt that four 2N7000's are cheaper than one CD4066.

2N7000 are cheaper in bulk. But the Cmos series logic chips were not designed for audio and have a lot of series resistance in their ON state and can only be used in high impedance circuits.

 

2N7000 are cheaper in bulk.

No surprise there.
Everything you buy is cheaper in bulk, including the CD4066, but I don't think the TS's circuit will be built in large quantities.

the Cmos series logic chips were not designed for audio and have a lot of series resistance in their ON state and can only be used in high impedance circuits.

What does "designed for audio" mean?
Here it's just acting as an analog switch, which it was designed for.
At 9V or above the CD4066 on-resistance (below) is not likely to be a significant factor in the TS's circuit with 10kΩ or greater resistors, especially since the precise values are likely not critical to the circuit operation.

Also the CD4066 will conduct rail-rail signal voltages, while the 2N7000 will not conduct any above its Vgs(th).
So for a 9V gate voltage, it will not conduct greater than a 9V-Vgs(th) signal source-to-drain.