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Circuit for Neutralizing Low-Frequency Regeneration and Power-Supply Hum

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1 Author(s)
Wen-Yuan Pan ; China Defense Supplies, Inc., Washington, D.C., and Universal Trading Corporation, New York, N.Y.

In high-gain multistage amplifiers, low-frequency regeneration frequently exists which affects the amplification characteristics of the amplifier and commonly causes oscillations and "motor-boating." A simple bridge-balancing circuit has been devised to neutralize this effect. Besides reducing regeneration, it also reduces the effects due to hum present across the plate-supply filter. Reductions in the order of 40 decibels are attainable.

Published in:

Proceedings of the IRE  (Volume:30 ,  Issue: 9 )