HUM_FREE_TUNER_SUPPLY

Published:2009/7/8 23:49:00 Author:May | From:SeekIC

Permits operation of high-quality FM tuner from amplifier supply without having hum due to positive feedback through shared ground connection.Circuit provides up to 90 mA at 12 V from any supply ranging from 24 to 34 V. Low output impedance eliminates all likely sources of feed-back and suppresses ripple. Circuit requires careful initial adiustment to limit current sunk by 741C opamp to Iess than 15 mA; coarse adjustment is made by varying number of 47-ohm resistors in parallel serving as BD136 omitter re-sistor, and fine adjustment by changing R2.-G.Hibbert, Avoiding Power Supply Hum, Wireless Wolld, Oct. 1973, p 515.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Power_Supply_Circuit/HUM_FREE_TUNER_SUPPLY.html

Print this Page | Comments | Reading(3)