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:

https://zlobmodular.com/product/dual-vco/

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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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