Monday, January 25, 2010

Casio RZ-1 Drum Machine Circuit Bent Part 2 Finished

Casio Drum Machine Circuit Bent Part 2 (Casio RZ1 RZ 1 RZ-1)Has a 24 point RCA patch bay that short circuits three of the four eprom chips. The different chips are for certain samples, so some patches effect only certain sounds. You can patch with in the chips and chip to chip. In addition to the patch bay there are four input / output on/off switch section with toggle switches and momentary buttons.

There is now a switch to bypass the RZ-1s main timing crystals with two getlofi 1799 precision oscillators to allow for some great pitch control. I still have a little bit of tweaking to do with some different pots and resistors.

I've added 10k pots on the top to easier access the samples tone control. Also, I replaced the internal permanent soldered battery with a replaceable one.

HUGE thanks to wotatwaat at exfade.orgfor his help!

Also, tucked deep in the lab is a RZ-1 Plus that I'm working on.


  1. Hello Mister!

    I wondered if you could elaborate on how you did the pitch with the oscilators? Could you show some pictures and schematics? I will start bending mine soon and your project is very inspiring!

  2. Kolliwois: Sorry it took so long to respond, I didn't even know I had a comment. I am building a second RZ-1 as you can see. So when it comes time for me to set up the timing crystal with 1799 Osc, I will do a post for you to see how.
    Thanks for looking.