I have a Telechron clock radio from the early 1950's. I'm going to build this circuit (it's in the middle of the page):
schreef in bericht news: snipped-for-privacy@m37g2000prh.googlegroups.com...
The schematic below is a result of a discussion on a Dutch group about lighting an ordinary red LED on 220Vac mains and a kit sold by Conrad
It can be switched on/off using a simple spst switch. The bridge and the elco can be low voltage types (50V) but be sure not to apply power without the 560E resistor in place. As currently dimensioned it sends about 15mA through the LED. Part of the energy is waisted in the 560E. It can easily be replaced by an 1k2 or 1k5 to reduce that waiste. This resistor can even be omitted if you are absolutely sure that the LED is always connected to the circuit when it is powered. The 220nF/250V~ should be lowered to 100nF when used with 120Vac/60Hz mains. If you want two LEDs in series, the 560E is too low. Make it 1k5 or 2k2 but be sure the bridge and the elco can stand the higher voltage. A 12V/0.5W zener may be even better.
Keep in mind: Mains voltages are always dangerous.
petrus bitbyter
You can use the switch you have.
Ed
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