8bit pitch shifter
This is not a nice sounding module, it's a pitch-shifter based on the HT8950 chip. I wanted the ability to add some 8-bit feeling to the analogue drum sounds from my drum modular. But the module can also be used as a wave shaper/wave folder/distortion. According to the datasheet: "The 8-bit A/D and D/A converters with a sampling rate of 8kHz ensures a high quality and high S/N ratio output voice. ". Yes indeed, 8 bit 8kHz must ensure high quality! :-) I bought it as a DIY-kit from Velleman for about 10 euros.
I've done some smaller changes to the circuit, most noticeable omitting the microphone and the output amplifiers, and adding input and output buffers. I also added a 250k potentiometer in series with R5, and changed the value of R5 4.7k instead of 47k. Since I have a +5V option installed in my modular I used this to do the +3V needed for the project.
Unfortunately there are no building instructions for this module, but at least you'll find the schematic, some photos, and some comments.
The finished module, without a faceplate, with my additional input output buffers and the +3V power on the stripboard to the right.
The finished module.
Here you'll find a sound sample rather soon.
That's it! Have fun and create some strange timbres!