🚀 go-pugleaf

walsh@optilink.COM (Mark Walsh) writes:

> From article <1992Dec26.063254.23524@murdoch.acc.Virginia.EDU>, by alexander@
> > In article <72415@cup.portal.com> dbell@cup.portal.com (David J Bell) write
> 
> #>>But a light dimmer I have installed makes the lightbulb RING alot, and
> #>>it's very annoying. The ringing gets worse when you dim the light. I'm
> #>>wondering if a "RFI free" dimmer will reduce this ringing. Anyone know?
> 
> > You might look more in the direction of using a full wave
> > rectifier and a filter cap. If you take the AC out of it
> > completely...It CAN'T ring.
> 
> > You'll wind up with about 140 volts DC and that through a
> > rheostat should work on a standard light bulb ok. (I think).
> 
> Yikes!  This will result in about 170VDC!  Not only is it a
> bit more dangerous to deal with, but standard bulbs run this
> way last a very short time.  But they'll be pretty efficient!
> You must have a pretty large rheostat handy, or else you are
> playing with fire.  There are far more efficient ways of
> dealing with voltage conversion these days.  Why has nobody
> mentioned switching power supplies, besides cost?
> -- 
> Mark Walsh (walsh@optilink) -- UUCP: uunet!optilink!walsh
> AOL: BigCookie -- Amateur Radio: KM6XU@WX3K -- USCF: L10861
> "What, me worry?" - William M. Gaines, 1922-1992

The voltage in DC will be just as safe as 120 VRMS x 1.414.
If the switch is between the bridge and the triac then no surge will 
occur to the bulb, just the triac!... I think this is the best & cheapest 
solution

Tony Stewart

dino@inqmind.bison.mb.ca
The Inquiring Mind BBS, Winnipeg, Manitoba  204 488-1607