replace a SPDT relay?

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=58291
Printed Date: July 06, 2025 at 11:40 PM

Topic: replace a SPDT relay?

Posted By: maximal
Subject: replace a SPDT relay?
Date Posted: June 24, 2005 at 1:59 AM

can someone help me replace a mechanical SPDT relay with something that's solid-state? here's what i'm trying to do...

posted_image

i have a StreetGlow Neon Music Interface (or MI). it switches the ground on and off to make the neons flash to a beat. this relay will make my neons flash alternately or wigwag. it's way to noisy, though. can someone help me come up with something that's solid-state?

Replies:

Posted By: hotwaterwizard
Date Posted: June 26, 2005 at 1:00 AM

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: hotwaterwizard
Date Posted: June 26, 2005 at 1:01 AM

" This has not been tested "

Concept Schematic.

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: maximal
Date Posted: June 27, 2005 at 5:39 PM

thanks hotwaterwizard, i'll try both out. in your first reply, what the part number of the first transistor?

Posted By: maximal
Date Posted: June 27, 2005 at 5:40 PM

oh, and these will be able to handle about 6-10 amps, right?

Posted By: hotwaterwizard
Date Posted: June 28, 2005 at 8:49 AM

With a large heatsink 15 amps with a small heatsink 5 amps.

Any General Purpose PNP Transistor should work for the first picture.

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

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