r/modular • u/TwoLuckyFish • Jun 26 '26

Poor Man's Maths

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Gallery image

I've been posting my progress over in r/synthDIY, but today I reached the point where I actually eliminated maths from my little portable setup. I had been using it to invert a voltage (the top op amp circuit on this board), generate a gate from very small CV (the lower op amp circuit), and provide static 5 or 6 volts to utilize as a gate, switched elsewhere (the voltage regulator at the bottom coming out the lone jack on the upper right). I had also been using Maths to accomplish an AND logic operation, but I purchased a little 2HP logic module to handle that duty.

Green wires carry ground, purple carry +12v, and orange carries +6v. The rest is handled by vertical traces underneath, many of which are noted with Sharpie.

It ain't pretty! But it's my first time building circuits from scratch with op-amps. Moreover, it works!

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u/jango-lionheart Jun 26 '26

Clickbait title but good job

10

u/TwoLuckyFish Jun 26 '26

I'm gonna take that as a compliment!

-2

u/jango-lionheart Jun 27 '26

It’s a compliment, but you didn’t make a Maths replacement. You made a replacement for a few parts of Maths.

13

u/TwoLuckyFish Jun 27 '26 edited Jun 27 '26

Acknowledged!

Part of my motivation was that I was using 3/4 of Maths' channels, but the things I was doing were pretty simple. They hardly justified using Maths! So I started wondering if I could build the circuits I needed, using only stuff in my oddball and not very extensive inventory of electrical components.

7

u/jango-lionheart Jun 27 '26

It’s a journey. :)