Saturday 20 April 2024

Allinaire Korg PS3200 (PS3300 Emulation MAM RS3 Res) MS50 MS20 MS10 VC10...

..

As a huge Korg fan I got to put together an Ensemble piece using 1978 era Korg Synths. The hero is the mighty PS3200 polyphonic synth playing homage to its big brother (and, as of 2024, soon to be re-released by Korg, the PS3300) by using the direct out of the 3200 into a MAM RS3 Resonator which recreates the famous PS3300 & 3100 modulated resonator circuit. The 3200 plays pads, base and noises. 
Lead lines and extra pads via an MS20 into a VC10 Vocoder combo give a haunting breathy sound. 
The SQ10 Sequencer drives the MS50 and MS20 synths for a rhythmic sequence and the MS10 with its famous pulse width modulation provides additional baselines. 
Effects include the SE500 Tape Echo and the more modern Kaos Pad Mini. 
All recorded on a Zoom R24 recorder. 
Percussion utilises some sounds sampled from the various Korg Synths and is added in Ableton Live. 

Recorded in April 2024, Wollongong courtesy of Jondent, with some additional sounds from my own original MS20 in Sydney. 

The Video is mixed together bits of footage from the session but missed most of the playing and modulation action - but still it’s always nice to see some vintage Korg gear in action! 

Additional notes: Some subtle detuning of the PS3200 individual notes was made possible via the Temperament Adjust mini pots. The PS3010 keyboard also provides for some interesting modulation effects via the joystick and the unique note triggering control. A Korg 3100 in the same studio verified the RS3 Resonator accuracy and the RS3 unit also is CV controllable like on the 3300. By using it with the PS3200 (which has 2 oscillators per note) it gets close to the functionality of a PS3300 but of course misses the fact that the 3300 has 3 Oscillators and 3 resonators etc. I look forward to the new PS3300FS announced by Korg at NAMM 2024.

Monday 8 April 2024

Circuitbenders CB55 - drum machine build notes.

These are my build notes for the circuit benders clone of the Roland/- Boss Dr 55 drum.
The clone is called the CB-55.
The original is a really simple and great sounding machine. It's definitely a classic.
I think where it falls short is it's limited sequencer, and that its tricky to sync to external gear. 
I loved the first DR-55 I bought so much, that I purchased a second one with the intention to mod it.
But I just couldn't vandalize  it .
Mods to overcome this are out there but I think its a shame to need to mod vintage gear. 
These relics are getting harder to find as the years go by and in the future, the ones that will
retain their value will be those in original condition.

So from a practical level, get an original to admire & treasure and build the clone to 
mod to your hearts content.


Links:


I'll install the trigger conditioning circuit.... connected to TRIG_IN1 connector.
This allows you to connect 5V triggers that last longer than 10ms





The build looks easy. all through hole with standard parts that i probably already have in my store.


Resistors first.

Caps 


fairly straight forward build so far.

D1 1N4001 Rectifier diode
D2, D3, D4, D5, D6, D7, D8, D9 1N4148 or 1N914
D1 is a larger 1N4001
rectifier diode that provides polarity protection for the power input, but all the others can be general purpose
small signal diodes such as 1N4148's or 1N914'




Jumper wires:
The jumper wires at J3-J7 connect the output of each voice circuit to the main mix bus.
These links are designed as 
jumpers for easy mods to provide individual outputs, but at this point it would probably be better to just install 
them. You can always change things at a later date.


the voltage regulators and transistors. 

REG1 is a 78L06 regulator that supplies the 6v power to the 
voice circuits. REG2 is a 78L09 that supplies 9v to the trigger conditioning circuit
ebay ... ordered



There is just one IC
IC1 - LM324 Quad opamp



T1, T2, T3, T4, T5, T6, T7, T8, T9, T10 2SC945 Or similar transistor
Its a  Bipolar (BJT)