This circuit with the PA7601 was found in a 1967 Philco-Ford documentation. The circuit has a pass band from 45 to 120 MHz.
This circuit was found in documentation from the 70s. The transistors are from that time, but the...
The circuit in the figure alerts you when the frequency of the pulses applied to your input, which...
This alarm circuit is from a 1987 publication, however the components used are still modern. The...