We found this circuit in a 1985 documentation. The transformer is an old TV flyback that has an exposed part of the core, where 10 to 20 turns of common wire are wrapped.
This circuit was found in an old publication about transistor. The original trasistors are...
This high quality circuit with complementary symmetry was found in an Electronics World of 1966....
This circuit allows the recovery of tapes with the passage of this media to the computer and other...