Vac Pak

Add Control Voltage to where YOU want it!

 

The Synthrotek Vac-Pak

The Synthrotek Vac-Pak

Have you ever wanted to add control voltage to a parameter on your synth or circuit bent toy? Now you can!

 The Vac Pak is a vactrol-based control voltage to variable resistance circuit.
  • Connect your CV source to the input jack.
  • Set the Scale and Offset trim pots to dial in your optimal resistance, with a range between ~300 ohms to ~10M (all vactrols are a little different in range).
  • Connect the wires from J4 to your circuit to make a variable resistor.
  • Daisy-chain multiple Vac Paks to the same power source using the remaining connector (either J2 OR J3).
  • Power the Vac Pak with a 9V battery clip (wired to J2 or J3) or with your circuit’s on-board voltage source (wired to J2 or J3).
  • An onboard 5V regulator allows the Vac Pak to be powered with 6-18V DC.
  • Caution: Do not exceed +10V DC on the CV input, more may burn up your vactrol!

Available at our online store and at fine synth retailers worldwide

BUY THE KIT HERE!

BUY THE PCB HERE!

1 Comment

  1. Tim Wellman says:

    Hi, I just received the kit and am interested in different things I could do with it.
    Is there any way to adapt this circuit to go the other way: convert a resistance like a potentiometer to a control voltage?

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