ungck

Sorry for asking stupid question like this, i just wanna comfirm am i right about the connection of these simple circuit.

wat i wish is to use a 5V signal to trigger a 24v input.
My control signal is 5V which i will connect to the transistor base with resistor in series, then i supply a 24V source to the collector with resistor in series as well.

So wat i wanna ask is:
1) is the way i connect this circuit correct?
2) where should i connect my output device, at the collector or emitter?
3) wat value of resistor i should be using and can i use transistor 9013?

Thanks for ur time reading and help.

Nigel Goodwin

You need to tell us what the load is.

But with that circuit configuration it needs to be in the collector.

You might look at the "Hardware Extras" part of my PIC tutorial, which covers this sort of thing.

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ungck

Actually i am trying to activate a valve with 24V, so i don think i load would affect much. If it is connected to collector, is it the +ve of valve to collector and -ve of vale to the emmiter.

And can 9013 support this?

Thanks for ur help, i really do apppreaciate it.

ericgibbs

hi.
Refer attached datasheet.

If the solenoid valve is 24V dc operation, it would be connected with +V end of the solenoid to the +24Vdc power supply and the -V end of the solenoid would be connected to the collector of the transistor.

The problem is you have not told us the current required by the solenoid or its resistance. This would determine if the current rating of the transistor is high enough for the solenoid.

If you drive a solenoid with a transistor you MUST have a clamping diode across the solenoid.

Do you follow this.?

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Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

ungck

i think i get wat u mean. i did try to connect the solenoiid valve at the collector with a diode parallel to it and it do works.

Thanks for ur help