My 8XA circuit

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what equivalent can i use instead of a SCR diode?

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You can use a transistor but you may run into limitations

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thanks dave,what tipe of transistor?mosfet?

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I used an S8035K SCR. works fine.

http://www.mouser.com/ProductDetail/Littelfuse/S8035K/?qs=zHiv0nsVGmq5QK0Mo7rZSB8JdfWac87Q

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Thanks verry much Aurgus,i will search it and buy it if i find it

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vic conections

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Thank for that scope shot Don.

Here's my 8XA Circuit set to 20Hz and as you can see it looks identical to Stan's drawings.
(http://www.globalkast.com/images/tonywoodside/IMG10014.jpg)

Here's the 8XA Circuit
(http://www.globalkast.com/images/tonywoodside/IMG10016.jpg)

Tony did you modify the AC freq from 60hz/120hz to 20hz?
how do you done this?

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The AC signal is 60Hz and when you connect it through the full wave bridge rectifier it then becomes 120Hz, I then set the pulse frequency from the frequency generator to 20Hz and that will give u this signal.