12_V_AT_5_A

Published:2009/7/16 23:40:00 Author:Jessie | From:SeekIC

Uses National LM340K-12 mounted on external heatsink, with series-pass transistor Q2 boosting current rating to 5 A. Provides complete protection from load shorts; output drops suddenly to nearly zero when current exceeds 5 A. R2 is several feet of No, 22 enamel wound on phenolic form to make 0.3-ohm 60-W resistor. CR1 and CR2 are HEP R0103 or equivalent. Transformer is rated 18 V at 8 A.-C. R. Watts, A Crowbar-Proof 12-V Power Supply, QST, Aug. 1977, p 36-37.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Power_Supply_Circuit/12_V_AT_5_A.html

Print this Page | Comments | Reading(3)