I overheard a conversation yesterday about doorbell lites. one guy asked why a 2-wire doorbell pushbutton lite was on when the button wasn't made and why it went off when it was made. the other guy mentioned that it had too much current when it was made and thats why the lite goes off. another said the circuit board is made with some sort of n/c and n/o set of contacts. when it is not made the lite is in series on the n/c set and is brought back to the line terminal. almost like two wires being saudered on the circuit board terminal.then when the button is made the n/o becomes closed and the lite turns off and rings the doorbell.
doorbell lite
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Re: doorbell lite
circuit board, smirkit board...the most common is a n.o. button with a light wired in series with the contacts..when button is "open" the light glows by completing a high resistance circuit to the bell. push the button, the lamp is "shunted", no longer in series with the circuit..enough current flows to ring the bell...
circuit board, smirkit board...the most common is a n.o. button with a light wired in series with the contacts..when button is "open" the light glows by completing a high resistance circuit to the bell. push the button, the lamp is "shunted", no longer in series with the circuit..enough current flows to ring the bell...
Re: doorbell lite
Beg to differ. The lamp is in parallel with the contacts. With the switch open, enough current flows to light the lamp but not enough to operate the bell. Close the switch and full current flows through the bell magnet but none flows in the lamp.
Where is Ed? Where is Ronald? We need a diagram.
[ October 19, 2005, 07:03 AM: Message edited by: rattus ]
Beg to differ. The lamp is in parallel with the contacts. With the switch open, enough current flows to light the lamp but not enough to operate the bell. Close the switch and full current flows through the bell magnet but none flows in the lamp.
Where is Ed? Where is Ronald? We need a diagram.
[ October 19, 2005, 07:03 AM: Message edited by: rattus ]
Re: doorbell lite
(red-faced)..rattus..opps, I stand corrected..slip of the tongue..you would think after 50 years one would learn parallel vs series...point is: its a simple circuit. no brain surgery...
(red-faced)..rattus..opps, I stand corrected..slip of the tongue..you would think after 50 years one would learn parallel vs series...point is: its a simple circuit. no brain surgery...- Status