AMPLIFIED_ZENER

Published:2009/7/7 5:31:00 Author:May | From:SeekIC

Combination of 1-W zener and 50-90 W audio trnsistor replaces 50-W zener in developing bias ror high-power tubetype linear amplifier Voltage of zener should be about 0.3 V less than desired bias voltage if using germanium transistor and about 0.7 V less for silicon transistor. Connec-tions are shown for PNP and PNP transistors.Use chassis as heatsink for transistor, with mica insulating washer for NPN. Ferrite beads dis-courage parasitic oscillations.-An Altemative to High-Wattage Zener Diodes, QST, June 1975, p45.



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