At 01:47 AM 11/5/02 +1100, Sean Alcorn - Avion Sydney wrote:

>As I pointed out in another post, it's not my design, but one of Paul
>Benford's. I simply posted it to know if this was the circuit that
>Roman was referring to in an earlier thread. However, this is of
>interest to me, as my next project will involve speed control using a
>triac. I am still not sure if Roman is referring to the Power Supply or
>the zero cross detection. But I have a similar, but slightly more
>advanced power supply in about 6 different products, and we have
>produced tens of thousands of these products without any failures. The
>oldest are approaching 3 years old, and therefore far outperform older
>analogue circuits we had previously. I've also seen these types of
>supplies used in many reliable commercial products.

I've been using a variation of that power supply for more than 20 years
now.  I've had almost ZERO failures.  It all comes down to the choice of
capacitor and surge limiting resistor.

BTW - the triac in that gif that you sent is shown with MT1 & MT2 reversed
- the side of the triac that the gate lead comes from should be connected
to the incoming line.

dwayne

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Dwayne Reid   <dwayner@planet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
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