Intercom with telephone (CB7829E)

Old phones with dials can be used in a simple home intercom system, as this circuit from Popular Electronics from the 90's shows.

| Clique na imagem para ampliar |

Wien Oscillator MOSFET Stabilized (CB12452E)
This oscillator has the output sine waveforms stabilized by a MOSFET. Equivalent types can be...
Synchrodyne Receiver (CB24243E)
We found this synchrodyne receiver for the medium or short-wave band in the Radio Electronics...
2.3 W amplifier (CB15905E)
This amplifier is suggested by Sanyo, for radio and recorder applications and makes use of a...