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Author Topic: Simple solenoid circuit  (Read 899 times)

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dylaninwv

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Simple solenoid circuit
« on: January 18, 2017, 09:48:00 am »
Hello, was looking for some insight.

Im restoring an old Standard Metal Typer. The solenoid coin circuit was missing, so I am working on reconnecting it. Basically, drop a coin, closes the microswitch, and momentarily charges the solenoid briefly lift the tab to release the bar lock. The parts are:

Power Supply: 12cDC, 1.75amp
Standard coin microswitch
Solenoid: 21-280, with + and - poles.
Adding in a could 1amp fuses to the circuit as well.

Below is the basic circuit that I thought it should be - am I on the right track?


Titchgamer

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Re: Simple solenoid circuit
« Reply #1 on: January 18, 2017, 12:03:55 pm »
Looks fine to me but take the fuse out of the -.
Should only be fuses in the + really.

dylaninwv

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Re: Simple solenoid circuit
« Reply #2 on: January 19, 2017, 08:27:14 am »
 Cool, thanks. I only have a two bay fuse block lying around, which is why I was going to fuse both lines.

Should I bother with a diode or not?

Titchgamer

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Re: Simple solenoid circuit
« Reply #3 on: January 19, 2017, 11:45:08 am »
Dont see why you should need a diode really.

dylaninwv

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Re: Simple solenoid circuit
« Reply #4 on: January 19, 2017, 12:18:20 pm »
Thanks Titchgamer.  :) :applaud: :applaud: :applaud: :cheers:

PL1

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Re: Simple solenoid circuit
« Reply #5 on: January 19, 2017, 12:40:57 pm »
Dont see why you should need a diode really.
Some solenoids and relays have a built-in diode (check the datasheet) that acts as a snubber to prevent chatter when the coil's magnetic field collapses.

There's a with/without diode comparison demonstration from 9:15 - 10:00 in this video.
Why diodes are used around relay coils


If there's no built-in snubber and you have a problem with chatter, add a diode.




Scott
« Last Edit: January 19, 2017, 12:47:08 pm by PL1 »

Titchgamer

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Re: Simple solenoid circuit
« Reply #6 on: January 19, 2017, 01:09:33 pm »
Dont see why you should need a diode really.
Some solenoids and relays have a built-in diode (check the datasheet) that acts as a snubber to prevent chatter when the coil's magnetic field collapses.

There's a with/without diode comparison demonstration from 9:15 - 10:00 in this video.
Why diodes are used around relay coils


If there's no built-in snubber and you have a problem with chatter, add a diode.




Scott

Cheers Scott,
Learn something new every day :)

  
 

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