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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Abu Simbel - Egypt

The Abu Simbel temples consist of  two massive rock temples.
Their name comes from  the town where they are located.... Abu Simbel (Arabic: أبو سمبل ). This is a village in Nubia, southern Egypt, near the border with Sudan.

 

..

They are situated on the western bank of Lake Nasser, about 230 km southwest of Aswan

These temples were built by the Egyptian king Ramses II (reigned 1279–13 bce),

 These 4 statues are of the King Ramses

The temple was moved in the 1960s to save it from flooding after construction of the Aswan Dam

These temples were discovered in 1813 by the Swiss researcher Johann Ludwig Burckhardt. They were first explored in 1817 by the early Egyptologist Giovanni Battista Belzoni.

 Carved around their feet are small figures representing Ramses’ children, his queen, Nefertari, and his mother, Muttuy (Mut-tuy, or Queen Ti). 

 Prisoners of War ? 

Are these scenes of Ramses' victory at the Battle of Kadesh?

The temple itself is dedicated to the sun gods Amon-Re and Re-Horakhte.It consists of three halls extending into the cliff.

The rescue of these temples was a huge engineering feat. The top of the cliff was dug away and both temples were completely disassembled.

They were then reconstructed on higher ground ..... more than 200 feet (60 metres) above their previous site. In all, some 16,000 blocks were moved.