Elektor Labs J2B 9bit synthesizer midi / Soulsby Atmegatron clone

Note: links to listings are affiliate links for which the site may be compensated.
video upload by Elektor TV

Elektor J2B Synthesizer First Demo of Prototype from 2014.

"This video shows Elektor's J2B Synthesizer prototype running a soft synthesizer engine ported from the ATmegatron by Soulsby. Listen carefully to the sounds produced by this beast and admire the way you can control it. LPC1347 rulez the waves :-)"

via this auction

"This is a port of the Soulsby Atmegatron 8-bit monophonic synthesizer to the Elektor J2B LPC1343 ARM Cortex-M3 board. The original Atmegatron is based on an 8-bit, 32 KB flash memory ATmega328 and the firmware is available as an open source Arduino sketch. The J2B board has a 32-bit LPC1343 ARM Cortex-M3 processor with 32 KB flash memory.

The Atmegatron has two rotary encoders, eight potentiometers and a pushbutton. Two potentiometers are for volume and bass boost, the others control the synthesizer itself. The J2B board can have up to nine rotary encoders, or eight plus a pushbutton.

The Atmegatron uses a bunch of bi-color LEDs to interface with the user. The J2B can have an LCD.

The Atmegatron uses PWM to produce its sound, the J2B has excellent PWM capabilities.

Based on the previous observations, porting the Atmegatron to the J2B should not be a huge task, which is why I started doing it. The most daunting task was to replace the analog potentiometers by rotary encoders while keeping the same feel.
Two rotary encoders replicate the Atmegatron encoders, six others simulate the potentiometers. The bi-color LEDs are replaced by a 2x16 LCD, but I added two bi-color LEDs to indicate the red/green modes of the synthesizer.

A cool thing of the J2B is its built-in USB capabilities making it possible to update the firmware from any Windows PC simply by copying a file to the board which is seen as an external drive. No programmer needed at all.

PWM capabilities of the LPC1343 are a bit better than those of the ATmega328, which allowed me to increase the sample frequency and gain a bit, making it a 9-bit synthesizer. So, in theory, the sound quality of the J2B synth should be a little better than the Atmegatron."

CLICK FOR MORE »

1974 Eko Ekosynth SN 0238

Note: links to listings are affiliate links for which the site may be compensated.

via this auction

"Vintage Italian Synth,classic Umiliani Sounds ultra rare synth."

You can find demos of the Ekosynth in previous posts here.

CLICK FOR MORE »

Korg PolySix SN 381225 w/ Original Box

Note: links to listings are affiliate links for which the site may be compensated.

via this auction

CLICK FOR MORE »

Korg SQ-10 Analog Sequencer SN 153008 w/ Original Box

Note: links to listings are affiliate links for which the site may be compensated.

via this auction

"For sale, a very beautiful korg SQ-10 in its original box, with Korg cables and original documentation. It will come fully serviced prior to sale."

CLICK FOR MORE »

Korg MS-10 SN 130372 w/ Original Box & Japanese Front Panel Layout

Note: links to listings are affiliate links for which the site may be compensated.

via this auction

CLICK FOR MORE »

1985 Yamaha DX5 w/ Custom Canadian Walnut Wood Side Panels

Note: links to listings are affiliate links for which the site may be compensated.

via this auction

"I had a local woodworker make end panels out of Canadian Walnut to accentuate the beauty of this massive beast. The synth is in fully working order with only a few small blemishes here and there. It comes with the original sheet music stand, and two cartridges. I have loaded it with some custom patches that a friend gave me. I think they really highlight the power of this instrument."

CLICK FOR MORE »

Sequential Circuits Prophet 5 Rev 3

Note: links to listings are affiliate links for which the site may be compensated.

via this auction

"The year of production of this model is 1983. The condition is good, there are natural temporary traces / scuffs. Bun in terms of performance - everything is perfect!"

CLICK FOR MORE »

Analogue Systems RS-100S Low Pass Filter Synthesizer Module

Note: links to listings are affiliate links for which the site may be compensated.

via this auction

See the seller's other items for more.

"The RS-100 24dB/oct low-pass filter imitates the Minimoog's filter and exhibits almost identical characteristics in both the frequency domain (i.e. what it does to audio signals) and the time domain (i.e. its response over time to CVs). Below the cut-off frequency the response is approximately flat down to DC. With the filter fully open, it will pass signals approaching 20kHz."

Note: Be sure your eurorack case supports Analogue Systems modules.

CLICK FOR MORE »

Analogue Systems RS-510E EMS Synthi Trapezoid Generator

Note: links to listings are affiliate links for which the site may be compensated.

via this auction

See the seller's other items for more.

"The Trapezoid Generator module is made under license of the EMS and is a remake of the EMS envelope shaper known from VCS3, Synthi A and AKS. It is a very unique modulator which can be used as a trapeze or triangle shape LFO and/or a attack-hold-decay envelope generator. It's flexible, weird and totally different from an ADSR."

Note: Be sure your eurorack case supports Analogue Systems modules.

CLICK FOR MORE »

PAIA Electronics Early Synthesizer Keyboard Catalog 1978

Note: links to listings are affiliate links for which the site may be compensated.

via this auction

"PAIA Electronics Synthesizer Catalog 1978. 6” x 8.5” 23 Pages"