Skip to main content
3 votes

Collector and Emitter of BJT are always shorted

Change the transistor to a PNP type in a common-base configuration. Collector to the two 1K parts, base to GND, input drives the emitter through a resistor. Adjust the values of R2 and R3 for the ...
AnalogKid's user avatar
  • 20.7k
2 votes

Collector and Emitter of BJT are always shorted

You can do this with two transistors, an NPN followed by a PNP, assuming you have +5 V available (since you're feeding it 5 V pulses this seems reasonable). Here's an example circuit: It's shown with ...
GodJihyo's user avatar
  • 23.7k
1 vote

BJT circuit questions

The 100 kΩ resistor provides some hysteresis to the circuit. It forms a potential divider with the 2k2 resistor. As VIN decreases Q1 turns off allowing the 470 Ω resistor to turn on Q2. This has the ...
Transistor's user avatar
  • 177k
1 vote

BJT not switching properly

If D13 zener voltage is less than VDD_IN, then R8 will turn on Q10 and a very large current will from from VDD_IN through D13 and Q10. This will cause heating in D13 an Q10, which may damage one or ...
Fabio Barone's user avatar
  • 4,084

Only top scored, non community-wiki answers of a minimum length are eligible