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


AWOL

Quote
what is the difference between the normal transisotr switch and a darlington connection?

Much higher gain
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
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jaylisto


Can you get hold of DPDT relays (or SPDT relays)?
Use those instead of the H-bridge.
I think I've already suggested this.



i searched it in google, the dpdt relay.
i think that is not possible. the dc motor continues to turn in a direction if there is no voltage in the relay...
jaylisto

jaylisto


Quote
what is the difference between the normal transisotr switch and a darlington connection?

Much higher gain


thanks for the fast reply.

the darlington has no resistor in the base?
jaylisto

retrolefty



Can you get hold of DPDT relays (or SPDT relays)?
Use those instead of the H-bridge.
I think I've already suggested this.



i searched it in google, the dpdt relay.
i think that is not possible. the dc motor continues to turn in a direction if there is no voltage in the relay...


You need to use two relays, one DPDT to determine forward/reverse and a one SPST to to perform the stop/go command, this second relay's contacts is simply wired in series with the positive voltage coming from the motor battery.

Lefty

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