JSISYNTH PROGUE

Project

Projecttitel: Progue

Status: FINISHED

Startdate: 02/2021

Duedate: 03/2021

Manufacture link: https://jsisynth.com/products.html

Description

PROGUE is a monophonic analog DIY synthesizer inspired by the two well-known vintage synthesizers: ROGUE and PRODIGY. While both of them had their pros and cons, the goal with the PROGUE was to combine their best qualities into a single portable tabletop synthesizer.

The prime focus was maintaining those specific sound characteristics that still makes them desirable today and to add some of the features we always thought they lacked.

From independently modulated PWM and Oscillator Gate Sync to passive High-Pass Filter and precise Fine-tuning of the Oscillators, PROGUE delivers it all without forgetting the modern self-evident functionalities like Polychain via MIDI.

Specs: (click to expand)

OSCILLATORS

Two discrete oscillators with Sawtooth and Pulse waveforms
Pulse width and pulse width modulation
Hard sync: OSC2 to OSC1 with envelope control
Oscillators can be synced to Gate
OSC2 tuning: Interval and Beat (fine) amount
Pink noise generator

MIXER

OSC1 amount
OSC2 amount
Noise / External input amount

FILTERS

Four-pole (24db/oct) transistor ladder Low Pass Filter with resonant control
LPF can be driven to self-oscillation
Keyboard tracking amount
Independent passive High Pass Filter

ENVELOPES

Two ADS style envelopes for LPF and VCA

LFO / SAMPLE & HOLD

Triangle, Square and random waveforms
Rate, OSC amount, VCF amount
Midi modwheel / aftertouch to VCF / VCA / both

MIDI

Built-in 16-bit Midi to CV converter with 2 channel DAC
1V/OCT and MOD amount (via mod wheel or aftertouch)
Poly-chain (for max. 5 units)

IN/OUT

Mono output (1/4" phone jack)
Headphones output (1/4" stereo phone jack)
Mono external input (1/4" phone jack)
CV input (1/4" phone jack)
GATE input (1/4" phone jack)
VCF CV input (1/4" phone jack)
Midi input and thru (5-pin DIN)

POWER

12VDC (0.35A) power adapter (2.1mm DC jack)

DIMENSIONS

Enclosure 10" x 6" x 2" (254mm x 152.4mm x 50.8mm)

BOM:

PROGUE-REV-A-BOM.pdf (last version February 2020)

Digikey: https://www.digikey.fi/short/4720z1

https://www.mouser.fi/ProjectManager/ProjectDetail.aspx?AccessID=ee29d19e63

make sure you order the Tempcos from Digi-Key : ERA-V33J101V‎

and order the case from Digi-Key or mouse, see above BOM (pdf)

https://electricdruid.net/product/noise-1b-noise-generator/

^{the ribbon cable is pretty expensive, so if you like to make your own, just switch the pre-made in mouser cart to FM connectors 2x17 (34)}

^{LM393D should be 511-LM393ADT}

^{alpha 9mm not in card available from UK-elektronik}
^{2x C1M}
^{1x C50K}

Guide:

ID	date	issue	solution	fixed in production version

ID	date	issue	solution	fixed in production version
1	26.1.2021	info- ribbon cable	its cheaper 15cm is fine NEVER use Floppy disk cables - this are not 1:1 pin assigned
2	INFO	ic pin out	DAC and LDO is upside down, all other pin1 top-left or check dadatsheet
3		C95A is C15A1 C95B is C15B1 on pcbs
4	26.1	bom change (last version is A)	R210 was 1k5 now 1k (SMT led resistor) C95a1 and C95b1 changed to: C95A and C95B added one dip8 socket to bom
5	26.1	install S7 at the end of the build - for prototype version only !!!
6	06.02-2021	check that no traces are under the slide switch tabs, and check for traces under the potentiometer tabs.	bend or cut them. ( Janne agreed that he change the pcb - production run don't have traces under the switch tabs and pot tabs)	unknown

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