Running a 24v relay from mains voltage?

On Wed, 26 Nov 2003 16:51:42 -0800, John Fields wrote (in message ):

Thanks, John. One more option.

Hello Dave,

I just installed my newsreader, so I do not know if anyone reads this, but here goes:

I had a problem like that once, I solved it with a rectifier for the mains and a 4093 as a gated oscillator to drive a 600V switsch mosfet. Very small circuit, not a lot of heat generation.

In your case, you can use one of the spare ports on the 4093 to generate the time delay again with small parts. You can use a resistor/zener to generate the low voltage rail for the 4093. Don't forget to add a clamp diode, otherwise the mosfet will probably not survive. Oscillator frequency is not critical, I used 50KHz.

Hope this helps.

Kind regards, Jochem.