Friday, 9 November 2018

LZX castle 110 Shift Register - DIY Modular video synth

What's a shift register?
"In digital circuits, a shift register is a cascade of flip flops, sharing the same clock, in which the output of each flip-flop is connected to the 'data' input of the next flip-flop in the chain, resulting in a circuit that shifts by one position the 'bit array' stored in it, 'shifting in' the data present at its input and 'shifting out' the last bit in the array, at each transition of the clock input." (wikipedia)

LZX describe this as a 4 position memory module (OR a 4-bit shift register).
The Shift register is like a 1 bit delay. Data goes in, and moves through the 4 positions based on the clock. D0, through to D3 are the output positions. Each position is one clock cycle delayed from the last.
 tHERE are 3 inputs: Clock, data and reset.

The main IC is a CMOS CD4015
For more on CMOS click here : CMOS

 The CD4015 consists of two identical, independent, 4-stage shift registers. Each register has independent CLOCK and RESET inputs as well as a single serial DATA input.
Only one of the shift registers is used so there might be scope to build a dual 110 module in the future.




Apart from the 4015, the only other major component to buy are the LM6172IN/NOPB.
You need 4 of these.

to be continued.... waiting for THOSE jacks.

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gOT tired of waiting for those jacks.



Shift register Patch 1



LZX - Castle
Introduction
00_000 ADC - Analog to digital converter
01_001 DAC - Digital to Analog converter
02_010 Clock VCO
03_011 Shift Register
04_100 Multi Gate
05_101 Quad Gate
06_110 Counter
07_111 Flip flops

Links
+ LZX Shift register patch 1 
+ LZX Shift register patch 2
+ LZX industries
+ Vimeo - video
+ CMOS 
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Video Index page

MaRF - build pics - 248r - rev 1

These are not build notes ... just some pics to help trouble shoot.

The Buchla MARF - Multiple Arbitary Function Generator is one of the rarest of Buchla modules.
I would love to find a real one (or even see one for that matter).
This modern version is the closest I have come to one.


Its a great module. This is Roman's rev 1 of the 248r.



Firmware updates
















these are some pics of the roman build MARF




A post shared by jono (@dj_jondent) on
Some videos of how it should work




A post shared by jono (@dj_jondent) on
internal stage addressing

Wednesday, 7 November 2018

Inside a Korg PS 3100

A friend requested some pics from my Korg PS 3100 the other day so I opened her up.
There aren't too many images of the insides this baby.




 We decided not to remove any cards from the cage.
The synth is working perfectly and we didn't want to disturb anything.






LZX 010 Clock VCO - Castle Video synth

The 010 Clock VCO is a square wave Voltage Controlled Oscillator with a linear response to CV.
It can be used as a clock source for modules such as the Shift Register and Counter.
You can switch between Horizontal and Vertical square waveforms
It looks like there are also high & low frequency ranges.
It might be useful to have more than one of these modules in your system.
This VCO is the 3rd module in the series and is in Eurorack format.

+12V Current Consumption: 9mA
-12V Current Consumption: 7mA
No +5V

It's 4HP and all through hole.
It doesn't require the 14 pin sync cable however the Vertical sync & Horizontal sync signals
enter the module via the power bus.
So you definitely need to use a 16pin power header.

This can be used with vidiot but as the Castle Clock VCO needs sync in the power bus  you'll need a sync generator (Cadet Sync Generator or V cortex) for that one.
Or you can sync from the front panel jack.

"It's a square wave vco, essentially. Prime for clocking logic". (Philip)


 tHE CD4046 - a phase locked loop vco

The 4046 is the core component. Its a PLL vco.
Totally different approach to the Cadet ramps & Cadet VCO

Ignore my placement of a 10 pin power header in the above pic. Use a 16 pin please.
Got tired of waiting on the jacks.
Decided to try the standard ones instead.






 ICs and impt components used:
CD4046BE ------- Phase Locked Loops - PLL PLL w/ VCO
LM6172IN/NOPB ---- Operational Amplifiers - Op Amps Dual High Speed,Low Pwr Amp
2N3904BU -------- Bipolar Transistors - BJT NPN Transistor General Purpose

LZX - Castle
Introduction
00_000 ADC - Analog to digital converter
01_001 DAC - Digital to Analog converter
02_010 Clock VCO
03_011 Shift Register
04_100 Multi Gate
05_101 Quad Gate
06_110 Counter
07_111 Flip flops

Links
+ ADC overview - LZX
+ LZX industries
+ Hackaday - the 4046 PLL VCO
+ CMOS
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Video Index page