BBx291 - Nonlinear circuit build notes part 2

This is part 2 of my build notes for the NLC eurorack formatt BBx 291 filter.

Its a module inspired by the Buchla 291.

+ 291r - build pics

Part one is here:

https://djjondent.blogspot.com/2021/06/nlc-bbx-291-vcf-build-notes.html

I'm up to making the vactrol box .

One header at a time.

This uses headers to construct a lightproof box to house a combination of LEDs and LDRs (Light dependent resistors.)

I'm using the GL 5516 as suggested

You can read a bit about vactrols here
https://djjondent.blogspot.com/2017/12/vactrols-optocoupliers.html

 

Make sure you have the PCBs the right way round.

I like to place the headers for the box one at a time.

requires a little patience to line everything up.

 

Time for the LEDS

Using red

+ LEDs 

four B100k pots,

three B10k pots - linear

Next the jacks and the panel LEDs

 

 

 

 

 

 

 

 

 

 

 

 

 

All Done

 

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You can find more NLC builds here.

http://djjondent.blogspot.com.au/2015/03/non-linear-circuits-ncl-index.html

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