We found the circuit of this Japanese transistorized commercial receiver in a documentation from the 1960s. It is a radio for the medium wave range with 6 transistors and 9 V power.
The operational of this amplifier can be the 741 and the resistors R1 and R3 are of 10 k. R2B is...
This decoder filter was found in a 1975 documentation. The integrated circuits can be 741. The...
This circuit puts the battery in the circuit when the voltage of a source is cut, preventing it...