Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
it is easy to make a circuit wich tells you if the phone in on/off hook, and maybe when it is ringing, but i dont know about the busy tone......
you can do the first three with some transistors base on the voltage that you have on the line...
highter dc for on hook , smaller dc for off hook, high ac for ring....
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