THE ENGINEER'S THUMB... At last, a better compressor!

[jmwreck]

Wow, it looks wonderful!
Is the text silkscreened?

Thank you. It's UV print from Tayda

[merlinb]

Hi, How would I connect a sinus LFO 0V to 5V to get a sort of tremelo effect? I tried disconnecting the 1K and 1uF and connecting the LFO to the + of opamp C with a voltage divider pot but that doesn't seem to work. I tried other ways to connect to pin 1 of VCA F but with varying results, not really satisfactory.

I would try this as a first instinct

[Hypernurbs]

Hi, How would I connect a sinus LFO 0V to 5V to get a sort of tremelo effect? I tried disconnecting the 1K and 1uF and connecting the LFO to the + of opamp C with a voltage divider pot but that doesn't seem to work. I tried other ways to connect to pin 1 of VCA F but with varying results, not really satisfactory.

I would try this as a first instinct

Thanks Merlin, I'm gonna try it soon. Although I already built your ET compressor and removed it from my breadboard. It's a very nice compressor so kudos to you. I added a 'dry blend' and it sits on my pedalboard right now, it fattens up my tones nicely!

[Hypernurbs]

I got an email right after I posted my previous reply, asking how I did the dry blend. I have added the schematic plus stripboard layout to this post. Maybe it can be optimized by the guru's overhere but for now it's verified by me and works.

It'integrated in the ET circuit so you'll have to tap the 4.5V Vref and replace the 1uF output cap with a jumper. The 1st lug (says 3rd but it's a typo) from the output pot needs to be connected to Vref instead of ground. Same goes for the dry put, it says lug 3 but it's lug 1 but you'll notice if you test the circuit, the volume will be the other way around...

The dry level pot maxed is a little more than unity gain from what I experience.

Opamp is a regular dual opamp.

[bluebunny]

https://www.premierguitar.com/gear/reviews/mayfly-flat-earth

Although the Flat Earth definitely feels like part of this lineage, it’s relatively quiet. That’s partly thanks to a circuit that uses a LM13700 chip inside the feedback loop.

Now where have I seen that before?   

[merlinb]

I got an email right after I posted my previous reply, asking how I did the dry blend.

II know people love a wet dry blend on compressors, but I keep pointing out that the ratio control on the ET already is a wet dry blend. It performs the same function!

[Hypernurbs]

Yes, I read that in this thread. And I can see what you mean, I think. But isn't it so that with a seperate dry blend, one can set the ratio really high and still blend dry in, for example? With the ratio control alone it's one way or another, it would seem to me.

[r080]

Interesting. I had not, in fact, seen that about the ratio control until today. Helpful information.

Kevin from AionFX just released a board for this project, and his documentation has that note on the ratio control.

https://aionfx.com/app/files/docs/nomad_documentation.pdf

Also interesting, Foxpedal's Refinery pedal seems to use both the ratio control and a separate blend, forgoing threshold control:

https://foxpedal.com/products/refinery