Ok , I had an old corded phone.
So I had the brilliant idea of connecting the green/red wires to the main 120VAC 60hz house outlet.
Since 90vac ring is only 30vac away from the house and 60hz is only 3 times that of 20hz ring....
It worked fine until I picked up the phone and then it started smoking....
It is still useable but doesn't work very well.
what I am curious about is what destroyed it would it have over heated if I left the phone on the hook eventually or was it completely from the fact that the phone went of the hook that killed it? (never did factor in the current which for phones would be typically in the mA where as wall amps is probably much greater ...but it didn't seem to effect it until I picked up the phone)
Also I built a timer 555 circuit that outputs a 20hz square wave.
It uses a 9volt battery so I am wondering how I can add-on to the
output so I can ring the phone by attaching it to the green and red wires of the phone.
I would think I have to increase the output voltage to 90volts from the 4.5volts it is at now for the output....
Can I do this with a homemade transformer from a coil of wires?
Also this is plusating dc is this ok to use or do I have to create an inverter circuit.....dun
I would think the transformer should work with pulsating dc because it is still a change in current which induces a changing magnetic field.....
But the question is can the phone ring with pulsating square waves or must it be ac sine waves?
Any suggestions are welcome.
I beleive this is called an orange box in the phreaker community?
Thanks again
So I had the brilliant idea of connecting the green/red wires to the main 120VAC 60hz house outlet.
Since 90vac ring is only 30vac away from the house and 60hz is only 3 times that of 20hz ring....
It worked fine until I picked up the phone and then it started smoking....
It is still useable but doesn't work very well.
what I am curious about is what destroyed it would it have over heated if I left the phone on the hook eventually or was it completely from the fact that the phone went of the hook that killed it? (never did factor in the current which for phones would be typically in the mA where as wall amps is probably much greater ...but it didn't seem to effect it until I picked up the phone)
Also I built a timer 555 circuit that outputs a 20hz square wave.
It uses a 9volt battery so I am wondering how I can add-on to the
output so I can ring the phone by attaching it to the green and red wires of the phone.
I would think I have to increase the output voltage to 90volts from the 4.5volts it is at now for the output....
Can I do this with a homemade transformer from a coil of wires?
Also this is plusating dc is this ok to use or do I have to create an inverter circuit.....dun
I would think the transformer should work with pulsating dc because it is still a change in current which induces a changing magnetic field.....
But the question is can the phone ring with pulsating square waves or must it be ac sine waves?
Any suggestions are welcome.
I beleive this is called an orange box in the phreaker community?
Thanks again
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