30HP Eurorack Circuit Builder & Tester

I have been using a custom-designed Eurorack modular synth to teach math & circuits since 2021. I am now updating the modular synth to make it easier for my students to use & learn. Ships in late July / early August.

I am building 20 extra of the Circuit Builder & Tester modules to help fund the cost of all the new modules we are building for my classes. Below are the features & specs of this module:
30 HP wide, Eurorack format
Built-in speaker & 5W amp
Removable half-size breadboard (2 included)
Inputs, outputs, and power supply circuits that can easily connect to the breadboard
Headers that make creating voltage dividers, filters & op amp gain simple
Three 100k potentiometers that easily connect to the breadboard
Built-in Bluetooth audio input that has breadboard & Eurorack connectors
RGBW lights that can connect to the breadboard that glow under the speaker
 
I can ship the new, blue version worldwide - shipping calculated at checkout. The image is a mockup, but I'll upload a real image once the first production model is made.

You can see an image of the original, white version in the second picture - you can purchase a used one for just $35 (not available outside the USA).
 
As I build curriculum directly around the new modules, you will also receive PDF files that you can use to learn about math & circuits. The curriculum is built around two oscillators (at least one VCO and one that can be an LFO), one mixer, one VCF (low-pass), one VCA, and an oscilloscope. If you already own these modules, you would be able to do nearly all the curriculum I build around our modular synth.

Want to help directly? Consider donating to my GoFundMe at https://gofund.me/5236092f7