Showing posts with label Eurorack. Show all posts
Showing posts with label Eurorack. Show all posts

Wednesday, 5 September 2018

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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Thursday, 30 August 2018

Timbre & Timbre - Dual Timbre - NLC build notes

These are my build notes for the Nonlinearcircuits Dual Timbre module.
Its in Eurorack format. The original timbre module was based on the Buchla easel timbre waveshaper circuit.
  The tri2sin circuit has been dropped, there is an input attenuator for each section.


This is simply a dual version of the Timbre!, It is all smd (the single version is thru-hole).
Andrew's blog notes are here:
http://nonlinearcircuits.blogspot.com/2018/01/timbre-timbre.html

The NLC build notes and bom are here:
https://www.nonlinearcircuits.com/modules/p/timbre-and-timbre

GET those ICs on first.

The BOM calls for a J112. Im using a J309
 863-MMBFJ309LT1G as the waiting time on the 112 is nearly a year

 Headers:
 Pots & Jacks


To be continued.................

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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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