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Arcade Collecting => Pinball => Topic started by: dylaninwv on January 18, 2017, 09:48:00 am

Title: Simple solenoid circuit
Post by: dylaninwv 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?

(http://i288.photobucket.com/albums/ll169/dylaninwv/circuit_zpsaz9mnx4d.jpg)

Title: Re: Simple solenoid circuit
Post by: Titchgamer 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.

Title: Re: Simple solenoid circuit
Post by: dylaninwv 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?

Title: Re: Simple solenoid circuit
Post by: Titchgamer on January 19, 2017, 11:45:08 am

Dont see why you should need a diode really.

Title: Re: Simple solenoid circuit
Post by: dylaninwv on January 19, 2017, 12:18:20 pm

Thanks Titchgamer.  :) :applaud: :applaud: :applaud: :cheers:

Title: Re: Simple solenoid circuit
Post by: PL1 on January 19, 2017, 12:40:57 pm

Quote from: Titchgamer on January 19, 2017, 11:45:08 am

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 (https://en.wikipedia.org/wiki/Snubber#Diode_snubbers) 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 (http://www.youtube.com/watch?v=c6I7Ycbv8B8#)

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

(http://forum.arcadecontrols.com/index.php?action=dlattach;topic=137899.0;attach=305106;image)


Scott

Title: Re: Simple solenoid circuit
Post by: Titchgamer on January 19, 2017, 01:09:33 pm

Quote from: PL1 on January 19, 2017, 12:40:57 pm

Quote from: Titchgamer on January 19, 2017, 11:45:08 am

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 (https://en.wikipedia.org/wiki/Snubber#Diode_snubbers) 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 (http://www.youtube.com/watch?v=c6I7Ycbv8B8#)

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

(http://forum.arcadecontrols.com/index.php?action=dlattach;topic=137899.0;attach=305106;image)


Scott

Cheers Scott,
Learn something new every day :)