Big room - NLC - Build notes - Part 2

These are a continuation of my build notes for the Big room module.

 

It's a non linear circuits module in the eurorack format

Part 1 is here:

93. The Big Room - Build notes- part 1 (reverb)

This module merges the Polyfusion reverb driver circuit with the 

NLC Segue for VC panning between wet and dry signals. 

It also has a VC feedback circuit.

22. Segue - NLC - VC panner/crossfader

Links

+ BOM

+ Wiki

I've been waiting on parts like a 2.2pf cap.

... finally arrived.

Trimmers

headers for power

transistors

 

Now the fun bit -- building the light proof box

a bit about vactrols;

+ Vactrols - Optocoupliers

Vactrols are basically light dependent resistors (LDRs) & LEDs housed in a light proof box.

The module needs two light boxes , each housing one LED and two LDRs,

GL5549s are recommended by Andrew.

 The trimpots which were soldered above, are used to adjust for any differences.

"One point – it is best to solder the LDRs in standing 8mm or so off the PCB, then bend them over towards the LEDs."

 

"A little bit of leakage does not seem to matter much
but you could add a bit of black silastic sealant around the edges if
you really want to"    .....  or some black electrical tape.

LED for vactrol boxes two 3mm best, diffused Red, green or yellow. THIS GOES ON THE BOTTOM OF THE UPPER PCB

100K B pots  & Jacks.

 

 

Green panel LED... I don't think the colour matters

The RCA connectors for the reverb tank were a bit difficult to find.

These are pics from the build notes.

 

 

I think I found some on Ebay ... will see when they arrive if they are ok.

I guess I could just wire the tank directly to the board, or use a different type of connector ??

To be continued......

Part 1:

 The Big Room - Build notes- part 1 (reverb)