S
steve
- Jan 1, 1970
- 0
I have made the circuit at the link below.
http://www.techlib.com/electronics/telephone.html
Its the first one in the list "Telephone in use indicator"
It works fine accept that when there is no one on the phone the LED
glows a little. (On hook I think they call it)
What can I do to stop it from glowing and using up the battery. I tried
to put a 500 ohm resister just after the LED between the LED and
positive eg LED --[500]--+ . This did not change anything.
Also is it right that when the circuit is not connected to the phone
system but the battery installed that the LED blinks. It stops blinking
when I hook it up to the phone system (it just glows a little)
Thanks
http://www.techlib.com/electronics/telephone.html
Its the first one in the list "Telephone in use indicator"
It works fine accept that when there is no one on the phone the LED
glows a little. (On hook I think they call it)
What can I do to stop it from glowing and using up the battery. I tried
to put a 500 ohm resister just after the LED between the LED and
positive eg LED --[500]--+ . This did not change anything.
Also is it right that when the circuit is not connected to the phone
system but the battery installed that the LED blinks. It stops blinking
when I hook it up to the phone system (it just glows a little)
Thanks