This 100 second timer was found in the September 1992 issue of Radio Electronics magazine. The circuit has two timing ranges and time adjustment at R6.
This is the old name given to flip-flops or biestable multivibrators. In fact, this is a 1967...
This 5.1 MHz oscillator was found in a 1980s American documentation. The used operational...
We found this circuit in an old English documentation from the 70s. The transistor can be a modern...