Tuesday, 20 February 2018

NLC Eurorack power distroboard.

Some pics of the nonlinearcircuits distroboard.

What is covfefe? The tweet by Donald Trump that baffled the internet ...

 (n.) When you want to say "coverage" but your hands are too fat and small to hit all the letters on your keyboard.

Back to the build.
Notice the noise reducing capacitors.  
These are decoupling capacitors. They filter out unwanted noise from power supplies.
"A decoupling capacitor is a capacitor used to decouple one part of an electrical network (circuit) from another. Noise caused by other circuit elements is shunted through the capacitor, reducing the effect it has on the rest of the circuit". (Wikipedia).

 In a eurorack system, each module shares a common path to the power supply.
So changes in the current drawn by one one module may produce voltage changes large enough to affect the operation of others. The decoupling capacitor works as the module's local energy storage. The capacitor is placed between the power line and ground. It provides a bypass path for transient currents reducing the chance of voltage spikes and fluctuations.

 I used 3.3K for the LED resistors

  the connector:
oo| GATE
oo| CV
oo| +5V
oo| +12V
oo| GND
oo| GND
oo| GND
oo| -12V 

An good alternative eurorack bus board with filtering that I've built is the Synthrotek one.

The build notes are here:

i ADDED +5V to this PSU using a simple 7805 voltage regulator and two 0.1uF caps.
The value of the caps could be 10uF or 1uF. I used 0.1uF mylar as I had these on hand.
If you decide to use electros, the negative end of the cap (cathode) should contact ground.

Another good alternative Power bus:
The Bastl instruments Juice Bus. This has onboard 5V

You may wish to add other voltages to your circuit. eg: 9V, 3.3V if you are prototyping circuits:
So ideas:

I haven't tested all these circuits, but notice that the input voltage is always higher than the output voltage.
Experiment with the capacitors
Most linear regulator datasheets suggest tantalum capacitors as they have higher ESR.
Remember that electrolytic capacitors (including tantalum) are polarized.
Best to read the datasheet and follow their instructions.

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