"nanoloop mono"

This cart uses the built-in analog components of a single PIC microcontroller (op-amps, comparators etc) to implement 3 analog channels, each with different filter characteristics.

- Tone: Dual rectangular waves with low-pass filter and switchable resonance (bridged-t filter)
- Click: Single pulse with extra-resonant bass filter for 808-like percussion (twin-t filter)
- Noise: Analog noise generator with higher frequencies, medium resonance bandpass filter (bridged-t filter)

The noise channel may also play two detuned, XORed square waves.

In this video, all filters are on, resonance is set to maximum and the tone channel's cutoff is controlled via buttons.


My goal was to use only the PIC and the usual bunch of passive components (Rs and Cs) to do as much analog as possible. The PIC acts as a hybrid soundchip here, somewhat similar to a SID, with a very specific character.


The whole circuit fits into a nanoloop one-like flat cart. Sound plays through the Game Boy's headphone output.

Last edited by oliver (May 13, 2016 3:26 pm)

this is totally sweet

very cool! Want more info!

Great! Nice drums too, btw. Sound like oldschool beatbox preset rhythm machine. I like that this way.

Very cool!

sounds good, very interested if they become available for purchase

Nice! cool

I wow ... now this will be a music tool of my dreamz. GO GO GO!

This does sound freaking fantastic. See how on the edge of my seat I am? No? Well I am. Ass is barely touching the edge by now.

Wow! big_smile

I'm going to be waiting for you to take orders and I will order more than one.

So preamp prosounds are a no? Sweet project.

Jazzmarazz wrote:

So preamp prosounds are a no?

I don't know. Isn't the VIN mixed to the signal within the CPU, pre-amp?

oliver wrote:
Jazzmarazz wrote:

So preamp prosounds are a no?

I don't know. Isn't the VIN mixed to the signal within the CPU, pre-amp?

Ah yes, my apologies. It certainly is

Hey oliver, when can I give you all my money?

sound is amzn