Intro: This circuit originally was designed for the first Formant Modular version in the 1970'th and is built around a ľa723. The circuit can be found here. My version of it comes from the book MSS2000 by HaJo Helmstedt. This PSU is a symmetric +15V 0 -15V unit fed by 2x 18V~. After rectification and filtering the transformator outputs are regulated by a ľa723 and the ouput voltages of +15V and -15V are current fed up by two 2n3055 transistors (up to 3 Ampčre per side). The power supply voltages can be obtained at 31 power terminals. Board of PSU:PSU in the ľNet:Back side of ľNet with power switch and power transistors:Reproduction hints: None. |