This circuit was obtained from an American 80's documentation. The balanced mixer can be shown in CB4234. The circuit is for controlling RF signals in a modulation system.
This circuit is from an old documentation of Radio Shack from the 70s. The transistor should...
This circuit allows the use of a milliammeter in the measurement of low frequency alternating...
This circuit was found in a 1966 General Electric documentation. It makes use of direct contact...