Increased filter range for Juno-66

Due to popular demand there is now a hardware update for the Juno-66. It increases the range of the filter control, which also allows larger amounts for the additional filter ADSR, Tri-LFO and SH/LFO. The range is increased by a factor of three.

We now ship the Juno-66 with this modification, it is however relatively simple to perform and can be done by a skilled solderer and any synth tech. This is how to do it.

The modification consist of two parts: Changing a resistor on the Juno-66 board and changing one of the capacitors you installed as part of the Juno-66 install.

Parts needed

  • 100nF through hole ceramic capacitor
  • Resistor: 20k 0603 or 24.9k, 24k or 22k resistor of your choice (see below)

Changing the resistor

Warning: If you break the Juno-66 while performing this modification it is your own responsibility. Take especially great care while removing the Juno-66 from its socket. The pins can break if too much force is applied. The best way to remove the Juno-66 is to gently pull it out of the socket on one side – but not the whole way, just a tiny bit. Then pull on the other side and repeat this until it is out.

21440_filterresistor_1

You need to change the value of the resistor marked above to 20k. You can either desolder it and replace it with a 20k resistor, or solder a 22k resistor in parallel. (22k gives you a slightly small resulting resistance of about 18k, if you can use a 24k, or 24.9k). These are 0603 SMD resistors, but it should be possible to solder a through-hole resistor across it.

Changing the capacitor

This is much easier.
All you need to do is to replace the 10nF or 3.3nF capacitor which you installed during the Juno-66 installation with a 100nF one.

caprep

That is it, enjoy your increased filter range!

 

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