There are 110 volt LED bulb replacements, but they are pretty expensive.=20 -------- Paul Anderson -- VE3HOP On 2012-08-30, at 6:33 AM, Carl Denk wrote: > Neon bulbs don't have a long life span, and for alarm type applications=20 > that's important. Also the neons blacken with age reducing light output.= =20 > I don't understand where 120/240 volt LED units are not readily=20 > available considering everything. I have a 240 volt backup residential=20 > hot water heater, don't want to use neons, space limited (The LED setup=20 > below would fit and will breadboard one in the near future), but would=20 > rather buy a UL rated product. >=20 > On 8/30/2012 3:53 AM, Paul Anderson wrote: >> Perhaps in this application a small neon bulb is more appropriate? >>=20 >> -------- >> Paul Anderson -- VE3HOP >>=20 >> On 2012-08-27, at 7:42 PM, Mark Hanchey wrote: >>=20 >>>>=20 >>>>=20 >>> This is one of those things that can be done but shouldn't be done. >>> Really to do it right the cost is pretty high compared to just using DC= .. >>> Capacitors at the rated voltages are not cheap, at least for the good o= nes. >>> A .47uf , 250V cap and a 1K, 1W resistor in parallel with each other an= d >>> the LED connected in series across that connection will work for >>> powering LED. I have seen bridge rectifiers built out of LED for low >>> voltage demonstrations. >>>=20 >>> Mark >>>=20 >>> --=20 >>> http://www.piclist.com PIC/SX FAQ& list archive >>> View/change your membership options at >>> http://mailman.mit.edu/mailman/listinfo/piclist > --=20 > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .