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Discussion Starter #1
At one time, I came across plans for a solid state relay but cannot find it anymore. I tried the search which didn't help. Does anyone have a link to those plans here on DIYMA?
 

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Discussion Starter #4
Thanks. You wouldn't happen to have a board layout would you? As simple as this is, i could draw it on paper or use the pcbexpress software.

Not that this needs to go on a board... It's more about making it on a board and playing around. It's been yrars since I've etched a board.

Sent from my MB860 using Tapatalk
 

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I use perf-board, plated through holes.
It's less hassle than etching boards.
The most time-consuming part of making these is
fitting flying leads to a mini-molex plug.
I usually stagger the transistor legs, then line up the resistors
to the appropriate legs. The transistor can be bent over the
resistors to reduce the footprint.
The board ends up being just slightly larger than the transistor,
and has a really slim profile. Put a bit of backing on the solder side of the
board, slip the whole works into some heat-shrink and you're ready to go.
One of these days, I'll remember to take some photos when I
put a few of them together.
 

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for what an off the shelf 4-pin solid state relay costs............just buy one.
 

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Discussion Starter #7
I use perf-board, plated through holes.
It's less hassle than etching boards.
The most time-consuming part of making these is
fitting flying leads to a mini-molex plug.
I usually stagger the transistor legs, then line up the resistors
to the appropriate legs. The transistor can be bent over the
resistors to reduce the footprint.
The board ends up being just slightly larger than the transistor,
and has a really slim profile. Put a bit of backing on the solder side of the
board, slip the whole works into some heat-shrink and you're ready to go.
One of these days, I'll remember to take some photos when I
put a few of them together.
You know, that that is a good idea instead of etching. I have another project in mind for my salt water tank that I can play with PCB.

What do you use the molex for? Is this for the power and ground connection? I thought about that and then use a small terminal strip for the 12v out remote turn one legs.
 

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Discussion Starter #8
for what an off the shelf 4-pin solid state relay costs............just buy one.
Very true, but for me, it would cost $0.00 as I have several of them laying around the shop. For me, it's about DIY. And, I have had some bad luck with relays failing over time.
 

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Discussion Starter #9
Tube Doctor, Thanks for your help. Here is the semi-finished product. I thought I had a 3 plug molex but only a 2 and my shrink tubing is just a little too small. I'll pick those up in the morning.

I decided to use the screw connectors on the board so I could change wires easily later on if needed. The output has four connection points.

The best part, it works as advertised. I plan on using a 3 amp fuse. Think this is a good size?

I'm sure yours is much cleaner....

Front:


Back:
 

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Hey Bhammer, looks fine for a first try.
3 amps for the fuse should be good.
Anything over 5 amps, & I prefer to use
the 2N6387 and put a little clip-on heat sink
on it.
Believe me, it gets easier & faster over time.
I've been using this circuit since reading about it
in Autosound 2000, close to 20 years ago, so don't
worry about things being less than elegant for now.
This is DIY, after all.
There will NOT be an exam after the lesson..............

Here are some photos of one I just put together.
Takes about 10 minutes, if you've got your bench organized.
Pardon the 2 watt resistors, that's all I had on-hand this afternoon.
Start with image 1, work your way to image 8. They're in reverse order
on the photobucket page.

Pictures by thetubedoctor - Photobucket
 

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Discussion Starter #11
I like the larger resistors. I thought about going up to a 1 or 2 watt as my resistors get pretty warm after about 30 minutes of running with a dummy load on.

Yours looks nice and clean!!
 
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