Power Supply for Standalone Preamp


Posted on Feb 7, 2014

If you`re just building a dual stand-alone preamplifier (as for, say, a stereo magnetic phono preamp), your power supply requirements will of course be greatly reduced. Figure 5A shows a simple supply using readily-available 12 volt, 1/2 ampere transformers (units capable of 1 ampere preferred for continuous operation). The 12 volt output from the first transformer is used to power


Power Supply for Standalone Preamp
Click here to download the full size of the above Circuit.

the filaments, and is also fed to the second transformer connected as a step-up device to provide about 110 VAC. This supplies a voltage tripler circuit that provides the 400+ volts required for the preamplifier circuitry.




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