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Topic: transistor switch logic . very hard to solve this scenario. (Read 4 times) previous topic - next topic

HazardsMind

Double check your wiring, and make sure only one side of the H bridge is on at a time.
Created Libraries:
TFT_Extension, OneWireKeypad, SerialServo, (UPD)WiiClassicController, VWID

jaylisto


Double check your wiring, and make sure only one side of the H bridge is on at a time.




this half of the hbridge didnt also work. as the first transistor doesn't triggered since the load is in the emitter.
jaylisto

HazardsMind

I don't think 3.5 volts is enough to drive that circuit. Try 6 or 9 volts, and 5v at the base.
Created Libraries:
TFT_Extension, OneWireKeypad, SerialServo, (UPD)WiiClassicController, VWID

dc42

That circuit will not work as it stands and may damage the lower transistor because there is no resistor to limit the base current. Put a 100 ohm resistor in series with the base of the upper transistor, and a 470 ohm resistor in series with the base of the lower transistor. Increase both the power supply voltage and the drive voltage to 5V. That will give you about 3V or 3.5V across the load.
Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

jaylisto


That circuit will not work as it stands and may damage the lower transistor because there is no resistor to limit the base current. Put a 100 ohm resistor in series with the base of the upper transistor, and a 470 ohm resistor in series with the base of the lower transistor. Increase both the power supply voltage and the drive voltage to 5V. That will give you about 3V or 3.5V across the load.


is this what your trying to express?

jaylisto

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