M
M.Joshi
- Jan 1, 1970
- 0
Franc said:I am trying to design an audible/visual indicator that beeps every 5
minutes when a light switch is turned on.
The complete circuit has to fit behind a light switch plate and so a
transformer cannot be used.
This can't be done unless you have a neutral at the switch position
When
the switch is on there is no potential difference between th
terminals
therefore no power source.
What about using a dimmer switch set to about 90% duty cycle? The
circuit could grab some power during the 10% off time.
- Franc Zabkar
This is not being built for a blind person - This light switch ofte
gets left switched on all the time as it controls a light outside.
It already has a neon light on it which seems to dim when the light i
switched on?
If I build the circuitry into a separate box next to the light switch
is there an easy way to sense when the switch is on/off