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
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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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