DIY SYNTH PSU: How to design a simple dual power supply
IMPORTANT! Please note that this is not a beginner’s project. If you are new to electronics DIY, I strongly recommend you start out using 9V batteries. I don’t take any responsibility in case you burn down your house!
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[UPDATE: I used to have links to shops that sell wall warts here, but they’re no longer valid. You’ll have to look for them yourself. Sorry!]
In this video, I walk you through the process of building a simple dual power supply. Conceptually, it’s identical to the MFOS wall wart PSU or the FC Power by Frequency Central. It can be used to power your self-built synthesizer modules. If you want to build along, here’s the bill of materials:
1x 7812 voltage regulator
1x 7912 voltage regulator
2x matching heatsinks ( screws/nuts)
1x thermal paste
3x 1N4007 rectifier diode
6x 4700 uF electrolytic capacitor
4x 1 uF ceramic (or tantalum) capacitor
1x 12V AC to AC wall wart
1x matching plug socket
Chapters:
00:00 Intro
01:33 DC vs. AC adapters
04:02 Voltages & ground
06:30 Rectification
08:23 Which wire is ground?
10:12 Rectification in practice
11:20 Filter caps
14:09 Ripple & voltage regulators
17:38 High frequency ripple & decoupling
20:09 Regulator protection
23:00 Negative rail
25:25 Outro
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