This circuit retriggers when a new pulse arrives. It does this by discharging the capacitor. The circuit is from a documentation from the 80s. The transistor can be any general purpose one.
Found in 1965 Delco Radio documentation, this circuit uses transistors from that era. Modern...
This circuit was obtained in a 1979 publication but can still be easily assembled today by...
This receiver was found in a documentation by Gernsback from 1960. The circuit uses high impedance...