Opto replacement for relay

Hill Hopper

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Back earlier Jon and some of us were discussing low power mods, and I linked to a pic of a small board that I etched which has a 10k resistor, and a NEC PS2501-1 opto. This is a direct replacement for the relay on an MS20, and now I'm set up a little better where I can etch larger quantities. If anyone is interested,I've got these for $3.00 a piece + $1.00 shipping for up to 10. Not as economical as Jon's "Dead Bug", but a lot easier to install. If anyone is interested, E-mail me.
 



Tinhorn

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Your idea reminds me of the old vacuum tube days when some tubes had "subs" made using Solid State Components......

Good Idea!

Tinhorn
 

Hill Hopper

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My dad was a double E from back in the 40's and I still remember him playing with substitutions in vaccume tube circuits with transistors, and how excited he would get, or how frustrated if he let the smoke out.
 

Hill Hopper

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This is just kind of a footnote I guess. Somehow there was a little confusion that this was a timer. IT IS NOT. It is only a lower power replacement for a relay on the MS20. It does the same thing that Jon's "deadbug" opto does, but is easier to install since its on a board and already made up.

AEH and I HAVE been working on a timer which should be posted on here sometime today or tomarrow, but this post was not for it. Sorry if there was any confusion.
 

kmitch

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Sounds like we have done the same thing. I've worked up a circuit to add the walk test LED using an external switch. I have the PCB laid out to incorporate the internal timer and optocoupler. The board will be the same width as the MS20 board. I mount my MS20 boards in a slot similar to the original mounting so I'll add another slot for the timer/opto board. I'll try to post the circuit later today. I am going to do a test run on the PCB this weekend. If it works out I'll make the artwork available.

Keith
 


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