I prefer optical for strict precision. Didnt know if you wanted to go that direction.

What is it that the reeds switch  on and off? Coils? How much current, voltage would the optical have to handle?

Below is a typical optical wheel sensor circuit. These can operate reed relays easily, which would bring the motors circuit back to the way it is intended using reeds as the actual switch.

Mags

Hi Maggluvin,
Thank for your post, it is all time interresting to look for strict precision.
I am not a electronic specialist, if you have some idea to connect some opto to control the SSR. the Q2 run under 24 VDC and the SSR take  maximum 20 mA under 3.5 to 32 VDC. If I am wright this sort of opto works under 1.2 VDC. I try to know the best way for the circuit.

Regard, Marcx41

Hey Marc

The sensor I posted uses 5v and switches to ground when light is passes to the optic sensor from the led. If you can give me a part number on the ssr, I can look up a data sheet and try to work something out for ya.    Shouldnt be that hard to do and not expensive. The sensors dont have to be as I have shown. They can be individual led's and optic sensors.  Just off the top of my head, if the input is not that much to the ssr to trigger it, the sensor shown could possibly work as shown ans just apply power to one terminal of the ssr input and the sensor will ground the other terminal when light hits the optic sensor.


Then for the actual trigger wheel with holes or slots can be made with black plexy 1/8 in.  If you have 2 discs, you can make them so that one is adjustable on the other to make the holes or slots larger or smaller for shorter and longer durations of on time, without having to try and remake new timing wheels.

Mags

Hi Magluvin, thank for your time, you can find some specifications on the attach piece, I hope you find what you need.
I have no problem for the disk, I use two opu200 for the 4 SSR to run the generator stage but they run under 10 to 35 VDC, eat 200 mA and are realy expencive ( I have it and I use it ).....

Thank again, Marc

From the looks of it, the optical sensor shown would drive the relay on its own as shown. Just apply 5v to one side of the relay control and the same circuit I posted, connect the output of it to the other control line of the relay. 5 to 30ma is fine I believe.  I dont have an ssr to try.

But if you have a Radioshack near by.......
http://www.radioshack.com/product/index.jsp?productId=2049723&locale=en_US

It should work the same as the circuit device I posted, just separate parts, led and photo transistor.

Mags