Hi
I have an IP phone which I need to connect to a LOUD ringing bell.
I have used a ne555 timer chip and a driver transistor to ring the bell which works well. Ie when power applied the bell rings contiunesly.
But I need to now connect it to the IP phone.
The connection I can get on the phone is to the 2 wires on the small 8ohm internal speaker inside it which is only used when it rings and speakerdial.
(we wont use speaker dial).
I was hoping on feeding the 2 wires from the speaker into a small transistor switch which would light a led in an opto isolator and pull the ne555 reset line high only when sound rings ie ring silence ring silence the ne555 would run only when the phone actually rings.
Any simple ideas ?
Thanks
Nick Colyer
I have an IP phone which I need to connect to a LOUD ringing bell.
I have used a ne555 timer chip and a driver transistor to ring the bell which works well. Ie when power applied the bell rings contiunesly.
But I need to now connect it to the IP phone.
The connection I can get on the phone is to the 2 wires on the small 8ohm internal speaker inside it which is only used when it rings and speakerdial.
(we wont use speaker dial).
I was hoping on feeding the 2 wires from the speaker into a small transistor switch which would light a led in an opto isolator and pull the ne555 reset line high only when sound rings ie ring silence ring silence the ne555 would run only when the phone actually rings.
Any simple ideas ?
Thanks
Nick Colyer