I am designing and building a series of Eurorack modules for interfacing modular analog synthesizers. You may check my other Eurorack audio module projects.
ELECTRONICSThe goal of this module is to produce the standard voltages of a Eurorack power supply: +12V, +5V, and -12V. Although I use commercial Eurorack mounts for using my designs, when developing and debugging it is quite handy having an independent power supply. The design is not optimized for size nor price. I just wanted to have a simple supply with components I had at hand.
As we need both positive and negative DC voltages, one of the simplest way to obtain them is from a single transformer with two outputs. I use a Roqma 603 transformer, with 110/220VAC input and two 15VAC and 0.3A outputs. Any similar transformer will do. The outputs are converted to DC using a W08G diode bridge, obtaining +15VDC and -15VDC.
Once we have the DC voltages, then we use 1A voltage regulators, LM7805 and LM7812 for positive voltages and LM7912 for the negative one. 100nF and 1000uF capacitors have been added to the input and 100uF to the output of the voltage regulators for filtering out noise. Additionally, LED have been added to the outputs in order to have some feedback of the circuit properly working.
Finally, the DC voltages are routed to an IDC-16 connector. Although you can use an IDC-10 connector (which is also standard of Eurorack modules), all the modules I have use IDC-16, so using this connector simplifies my wiring. As this is a simple design, I mounted all the through hole components in a protoboard. Then I fixed the protoboard and the transformer on a PVC foam support.
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