THE VIDEO BELOW SHOWS THE ORIGINAL FONITRONIK 555 PROTOTYPE – THIS GIVES A GOOD PREVIEW OF THE FANTASTIC WAVEFORMS AND TRACKING ABILITY!
A new updated slimmer version of the legendary 555-VCO circuit designed by Thomas Henry!
Thomas Henry’s description of the 555-VCO design in 2012: “This VCO uses easy to find parts. If I may be so immodest, this is my best design to date. The waveforms look great and if you check the measurements…you’ll see it’s the most accurate I’ve ever come up with. My favourite VCO of all times is the CEM3340, and I’ve always wanted to approximate it somehow. After nearly thirty years, I finally have a design which comes the closest. The accuracy on my breadboard was very good. The sync is a real treat and basically comes along for free. If you’re looking for cleverness, then be sure to check out how I did the sync, the ramp, and buffered the sine to keep the chip count down. So there it is. Have fun with it.“
Thomas Henry 555-VCO – Build Document & BOM
- Inputs: 1V/Oct, Sync, Lin FM, Exp FM, PWM
- Outputs: Tri, Ramp, Sine, Pulse
- New LFO-mode Switch & LED indicator
- Width: 10HP (Eurorack)
- Depth: incl. power plug: 40mm
- Power consumption: +25mA/-20mA;