ATTINY85-cowbell

ATTINY 85 cowbell circuit

Suitable for Music/Eurorack although in my case, I tend to stack two of em in a 200mm high panel.

The circuit

The diodes are Bat43.

code:

https://github.com/robstave/ArduinoComponentSketches/blob/master/ACS-85%20ATTiny85%20sketches/ACS-85-0105/ACS-85-0105.ino

There are other sketches there as well for other Arduino cowbell like things

# Previous Art

https://hackaday.com/2022/05/12/how-the-roland-808-cowbell-worked/

https://www.researchgate.net/figure/TR-808-cowbell-schematic-blocks-marked-adapted-from-1_fig1_267629988

Above may not be a good link.

> [!NOTE]
> Werner, Kurt & Abel, Jonathan & Smith, Julius. (2014). More Cowbell: a Physically-Informed, Circuit-Bendable, Digital Model of the TR-808 Cowbell. 137th Audio Engineering Society Convention 2014. 

Basically, the cowbell is two tuned square waves that are passed through a bandpass, attenuated by an envelope.

There are some versions that utilize the ATINY85 as just a dual square wave generator. 
todo:: find

This version is MUCH more simplified. The square waves are generated and summed in code and the envelope is applied appropriately to generate a pwm signal.