Showing posts with label DIY. Show all posts
Showing posts with label DIY. Show all posts

Wednesday, 5 September 2018

NLC - CellF Voice - Build notes

I've had this PCB/panel for 4 years... finally getting around to building this.

I finished the companion to this about a year ago, the CellF action.

These two panels were developed for the cellF neural synth project where a synthesizer was made to be controlled by live human neuron cells.


Some pics of the virgin PCBs

The CellF action build uses smd resistors, caps & ICs.
All transistors are thru-hole. 
 

The PCB is very large 


Each board has. 
2 tri-core VCOs 
2 LFOs 
2 LPGs 
3 VCAs 
VC spring reverb 
diff-rectifier 
jerkoff chaos 
2 281 EGs 
Sauce of Unce. 
Pots and sockets mount on PCB, no wiring (except to reverb tank). 


I'm building version 2.0  

 I usually put on the ICs first, as these are the most fiddly.

Regarding the NJM13700 .

I'm using   regular LM13700 SOIC . they will fit (in addition to some NJM13700s)
These are transconductance amplifiers.


I'm using 470 ohm resistors for the LED resistors (RL)



There are 2 CMOS chips used in the build: 4001 & 4066

Using these 10V zeiners

The 10V voltage regulator: 7810

JFETS: using J112 x 4

Vactrols:
Using 2 types:

The single vactrol NSL. the white dot marks the cathode.

VTL 5c3/2..... I used them a lot in the buchla "clones"
The sloped edge marks the cathode. The cathode is labeled on the PCB with a K.


The Dual LED has a common Cathode. Its orientation doesn't matter.
Check the led fits in the panel hole before putting it all together. I had a batch of duals that were a bit big and the needed 0.5mm drilled out.


almost there.
Final tests.

Notes:
+ NLC blog
+ Build notes - official version 1.3
+ Voice - prototype working 


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You can find more NLC builds here.
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Zlob - Dual VCO

Some pics of a recent build.
This is the ZLOB dual VCO.
 These aren't really build notes. Just pics to help my future trouble shooting.
The official ZLOB site is here: https://zlobmodular.com/


The VCO is a 4hp dual analog oscillator. Each VCO is CV controllable & has square, triangle, and sine wave out, coarse and fine tuning controls.

There is a control voltage input, and a switch for selecting exponential or linear cv in.
The exponential setting should be good for Korg & Yamaha keyboards & sequencers 

My choice to build this really was determined by its size. I needed a small footprint VCO for my euro performance rig.

Each VCO runs from 0.2 hz (5 seconds a cycle) up to 18k hz.
So this should be good as an LFO. as well as  a VCO.

The waveforms are very Stable as its temperature compensated
The waveform outputs are 10vpp

When a control voltage is inserted, the fine tune control becomes an attenuator for the incoming voltage. 

 Accidental cut of trace. My fault.... to be fixed.
In exponential mode, when the attenuator is fully clockwise, the VCO will track around 5 volts per octave.




 I'm joining these with rightangled headers.



nOTICE THE PCB repair to the lower left.


tHE final component installed was the 2K tempco resistors. I used this heatsink paste.


LOvely.... the VCO worked instantly... no trouble shooting needed.
Love it so much I think I'll build another.




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These are some pics from a second building of this module.
Some of the parts are slightly different
 















IC:
The TL072 first

The two LF412 op amps next


The TL 074

 

Finally the two  8038 ICs








Official build notes:

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For more Euro DIY builds click here:
http://djjondent.blogspot.com.au/2017/12/diy-index.html
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