MATRIXSYNTH: New Improved YuSynth ADSR

Monday, January 03, 2011

New Improved YuSynth ADSR

via YuSynth on

"I now propose an improved design of the yusynth ADSR.
The changes are :

Now the input stage is a discrete Schmitt trigger. As such any signal (this means not necessarily a regular GATE signal) can be used to trigger the ADSR as soon as its level goes above 2V.

The input impedance is now very high which makes it possible to feed more than four ADSR on the same GATE signal source without problem.

A buffering stage as been added between the SUSTAIN potentiometer and the DECAY potentiometer. This fixes a slight bug that made the DECAY rate dependant of the SUSTAIN setting. Now they are completly independant.

A short/long envelope option is now provided by setting jumpers on the PCB which select proper timing capacitors and ATTACK resistors. Note that this can be as well connected to an "on panel" DPDT switch to allow interactive selection of the ADSR mode.

And ultimatly, a resistor can be added or ignored to set the range of the REVERSE ADSR mode. Without resistor, the range is 0V (quiet status) to -10V (max range); with the the resistor installed, the range is +10V (quiet mode) to 0V (max range).

Check this at

Another important change is that from now the yusynth PCBs will provide prints for both DOTCOM style PSU connector and MOTM style PSU connector !"

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