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Electronic Circuit Answered

I have a spst relay(operating voltage-12v) using for switching the solenoid valve(24VDC and 0.5Amp) which connected through 24 V battery. relay is again connected to the transistor BJT NPN . So please suggest me that which transistor is most suitable.

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mpilchfamily (author)2013-09-30

Any NPN transistor that can handle the current that needs to flow though it.

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user

No, you also need to check that MINIMUM Hfe is high enough that the required base currrent ( = load current/Hfe) isn't too large for the PIC to drive.

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user

An optocoupler to a SCR or a Triack would be better.

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user

Why not I do it on DC all the time.

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user

I think I just replied to myself.

When there is no more power to the LED in the optocoupler.

See my Instructable Ghost Busted.

https://www.instructables.com/id/Ghost-Busted/

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user

When there is no more power to the LED in the optocoupler.

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Josehf Murchison (author)2013-09-30

2N3700 should do you nicely.

With it at o.5 amps it will be functioning at Q.

Joe

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