This circuit activates a recorder from the signal obtained from a telephone line in the service. It is used to make automatic call recordings.
This circuit was obtained from a Popular Electronics of the 90's. Any power MOSFET can be used as...
This alarm circuit with sensors in series was found in the Electronics Now magazine of June 1994....
This Radio Electronics circuit, in an 80's edition, decodes the 67 kHz signal used at the time to...