What's does the diode do?

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audioduck

Member - Posts: 25

Joined: February 11, 2005

Posted: October 25, 2006 at 9:20 PM / IP Logged

I designed this circuit based on the one from here in the lower right corner. I'm curious as to why there is a diode between 85 and 86 on the left hand relay? Is it really necessary?

haemphyst

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Joined: January 19, 2003

Location: Michigan, Bouvet Island

Posted: October 25, 2006 at 10:09 PM / IP Logged

No. Your circuit is all hardware. The diode is for reverse spike voltage protection in electronic circuits (ie, alarm outputs). In THIS case only, the diode is optional, but if ever using a solid state control circuit, I would make sure it is there.

It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

audioduck

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Joined: February 11, 2005

Posted: October 25, 2006 at 11:12 PM / IP Logged

I understand, thanks for your reply.

hotwaterwizard

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Joined: December 11, 2003

Location: California, United States

Posted: October 26, 2006 at 11:38 PM / IP Logged

What are you trying to do here? The circuit needs simplified.

A diode can also be used as a check valve preventing flow of current from going a direction. The Diode may be there to prevent false triggering of the latching relay.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

hotwaterwizard

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Location: California, United States

Posted: October 26, 2006 at 11:42 PM / IP Logged

What's does the diode do? -- posted image.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

hotwaterwizard

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Posted: October 26, 2006 at 11:44 PM / IP Logged

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

hotwaterwizard

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Location: California, United States

Posted: October 26, 2006 at 11:45 PM / IP Logged

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

audioduck

Member - Posts: 25

Joined: February 11, 2005

Posted: October 27, 2006 at 7:30 AM / IP Logged

hotwaterwizard wrote:

What are you trying to do here? The circuit needs simplified.

A diode can also be used as a check valve preventing flow of current from going a direction. The Diode may be there to prevent false triggering of the latching relay.

What I"m trying to do is turn driving lights on and off with a 3-way momentary switch on a motorcycle. Of course I know that the best/easiest way would be to simply use a simple on/off switch to control a single the relay but in my case I'd like to use a particular 3-position momentary switch that is already built into the handlebars for turning the driving lights on and off.

hotwaterwizard

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Posted: October 27, 2006 at 8:38 AM / IP Logged

on off on momentary correct ?

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: October 27, 2006 at 8:51 AM / IP Logged

Here is a circuit suited to your application. Needs some work though.

I will work it out if you like.

What's does the diode do? -- posted image.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

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