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.
This circuit, which can act as a shield, was found in a 1969 documentation. The circuit uses...
This oscillator can generate signals from 100 kHz to more than 50 MHz depending on the crystal used...
This simple multivibrator circuit generates a 1 kHz signal rich in harmonics. The circuit is from...