This timer, like the previous circuits, uses a currently uncommon integrated circuit. The time is given by capacitor C1 and R2 which has the range of values indicated in the diagram.
This simple MW radio was found in a 1975 publication, but it can be mounted with BC548...
The coil and sockets of this circuit found in a QST depend on the frequency band that is intended...
The 4066 is better than the 401 B because the 401 B has a lower internal resistance when the...