This super regenerative detector circuit was found in an English documentation from 1963. The coil is frequency compliant. The transistors are germanium of the time.
This voltage level-triggered circuit was found in a 1969 Ferranti English documentation. Modern...
Using 555 integrated circuits, this alarm circuit was found in a 90s American documentation. The signal...
Unlike the CIR4620 circuit, the circuit shown in the figure operates by capacitance. This means...