DIY Hacks & How To's: Phone Intercom

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+5 1. cretu commented 7 years ago

This would have been great in the '90s lol
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+6 2. nomaddaf commented 7 years ago

But how do you make it ring? Not much good if the other end doesn't know you are talking.
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0 3. dopsy commented 7 years ago

#2 if i recall well, you increase the voltage (on analogic lines)
if i recall well, the idle is 24v in europe
and ringing is 40-90v
but again, don't trust me.