Saturday, December 31, 2011

BJT output current protection

There is a current limit near the output.

 Increasing current across the resistors above 0.7v will turn Q1, Q4 on. Excess current drained from Q1 and Q4.

circuit resilient to current surge, but not permanent current change. As output should remain at 0 vdc. Ideas base current for Q2 and Q3 is 175mA.

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