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HVSP mode: only ~4.8 V

Posted: Sat Jan 12, 2008 1:42 pm
by Guest

at the cathode of the diode I only get ~4.8V. After the resistor from the AVR-pin and before the Base of Transistor the Voltage differs only from 4.5 to 5 V. So that the transistor is not switching. What's my fault?


Posted: Sun Jan 13, 2008 7:17 pm
by christian
This is an NPN transistor. The voltage at the base should never exceed ~ 0.7 V. If you measure 4.5 to 5 V, the transistor is not connected correctly or it's broken.