This is a eurorack 4 channel attenuvertor with unity buffer or 3x or 10x gain pre-amp.
The board is 100mm high, 33 mm deep with the power header protruding a bit further. It should be 2HP wide.
This is totally untested, based purely on the circuit in Walter Jung's "IC Op Amp CookBook".
Will be testing soon, before getting the board made up.
ADSR module provides a control voltage that makes possible shaping the envelope of a continuous sound. It is mainly used to control the gain of a VCA module or drive the cut off frequency of a VCF module. As usual it is not restricted to these two obvious applications and can be extended to the control of many others modules.
The link to the original project page [http://yusynth.net/Modular/EN/AD...
# kxmx_bluemchen (Back PCB)
The kxmx_bluemchen is a open source, 4HP, Eurorack module powered by the [Electrosmith Daisy Seed](https://www.electro-smith.com/daisy/daisy).
The Daisy Seed is an embedded DSP development platform with an ARM Cortex-M7 MCU, High fidelity AKM stereo audio codec with up to 24-bit 192kHz, 64MB of SDRAM, and 8MB of flash memory. The Daisy Seed is a formidable platform wh...
A simple AR design using op amps, inspired by Nathan Ramsden. [https://synthnerd.wordpress.com/2016/04/06/envelope-circuits-a-simple-ar-design-using-op-amps/](https://synthnerd.wordpress.com/2016/04/06/envelope-circuits-a-simple-ar-design-using-op-amps/)
A simple pcb to easily measure the amp/current usage of a eurorack module. Add a jumper on each rail in the middle, and take the jumper away on the rail you want to check. Connect power in on one side, and the module on the other. There is a super short video showing how to measure and how it look like when it is done here: [https://youtu.be/46zdCIhjmmg](https://youtu.be/46zdCIhjmmg)
Eurorack modular synthesizers use IDC connectors to distribute power. They are 16 pin 2x8 male headers, or 10 pin 2x5. In each case, there are two columns of pins, #1 on the right, with 3, 5, 7, ... above it, and 2, 4, 6, 8, ... on the left.
Pins 1 & 2 are shorted together to supply -12V; pins 3, 4, 5, 6, 7, 8 supply GND; pins 9 & 10 provide +12V. Some companies only use these 10 connectors. On...
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