This sensitive Japanese mid-wave receiver from the 1960s has an output power of 45 mW and is powered by 3 batteries (4.5 V). The circuit is superheterodyne with an IF of 455 kHz.
We found this circuit in a documentation for radio amateurs from 1977. The circuit can be changed to...
This is the complete circuit of a binary counter for educational purposes. Found in the February 1973...
This old circuit that makes use of germanium transistors, can be modernized with the use of...