Power supply, plus the ground, using current up to 1 Amp.Normally used, IC Regulator no. 78XX. When used to power circuits.And the short circuit that occurred.If no fuse various equipment will be damaged.But if there is an electronic fuse circuit for IC number 78XX.Then when the, short-circuit.This circuit will act to stop paying current and voltage immediately.Thus preventing the loss.
When entering the input voltage, the circuit Q1 and Q2 at the circuit, a bi stable multivibrator circuit.The Q1 Q2 will start but will not work.Because, C1 connected to the base pin of Q1.Then, the charging.Therefore, the voltage at Pin Collector ‘s Q1, to bias the base pin of Q3.Through R4, so the Q3 conduct. And Q4 will conduct with.As a result, voltage input to pin 1 of IC1.Cause the output voltage Implemented.If there is a short circuit when? D1 has served as a ground to stand Q2 base pressure of about 0.3 volts, resulting in a loss Q2 stopped. Bi stable circuit has changed the operating environment to run Q1.
Making Q3, Q4 and IC78XX not work. There is no voltage at the output of the circuit.If you want to IC1 output voltage again, switch S1. To reset the circuit to return to work.Or the bi stable multibrator circuit changes state to work again, sure enough Q4 work.
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This entry was posted on Tuesday, November 16th, 2010 at 4:33 amand is filed under Power supply, Security
