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Inexpensive Temperature Feedback Controller for the Varian 63 CRA

Volume 33, Number 6 (Dec. 1979) Page 613-616

Siemer, Darryl D.

Construction details and the performance of a temperature feedback circuit added to the power suppy of a Varian model 63 furnace atomizer are discussed. The circuit incorporates a phototransistor temperature transducer and approximately $25 worth of readily available electronic components to implement both a variable temperature ramp rate and a variable maximum temperature function. The normal mode of operation can be selected if desired.