MATRIXSYNTH: Toppobrillo Dual 281 (Grayscale panel w/mods)


Friday, September 18, 2015

Toppobrillo Dual 281 (Grayscale panel w/mods)

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Published on Nov 22, 2014 ken mosley

"Just finished building a few Toppobrillo dual 281s with some grayscale panels. The clip shows various functions as well as demoing the addition of a manual trigger envelopes and push starting the LFO (a known issue with the build). The addition of an illuminated pushbutton switch add to the overall module's 'playability'."


via this auction

"Dual 281 Function Generator w/LED trigger switch mod (Eurorack)

The Dual 281 is an ASR/AR/LFO generator with voltage controlled inputs for Attack and Decay. This essentially half of the original Buchla 281 but designed for Eurorack Format modular synths. Make Noise's Maths was designed to mimic the 281 and Serge's Dual Universal Slope Generator. Several of these were built for a non-paying customer and now just trying to recoup costs on this last one. These were built with grayscale panels using Toppobrillo PCBs and offered to the DIY community. Wima caps used throughout with the exception of the 1.8nF film caps (Kemet). NKK switches long life switches, long life and low ESR caps for power decoupling. Blue LED switches allow for playing the module in real time...The FG can be triggered by finger. Check the vids. These were only mounted in a lab case and burned in for extensive testing."

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