ZEN Instruments

     I've been doing more projects that involve digital control of analog circuits, and I found myself needing to generate ADSR envelope...

     The Timex Sinclair 1000 (ZX81) is a charmingly limited computer from 1982. It has one of the worst keyboards of all time, and it begs f...

    I'm always looking for drum synths to document, and I recently found a "Synsonics  Pro Dual Kit" from Japan. Not to be con...

      After redrawing the Ibanez DL5 schematic, I moved on to the EM5 from the same line. The EM5 has become sought after, and commands hund...

           I've been looking at various delays, digital and analog. I came across the Ibanez DL5, from their "Soundtank" line....

    I've been experimenting with controlling analog effects pedals, like this chorus . I bought a cheap "Koogo Analog Delay" t...