This circuit, found in a 1977 documentation, indicates when the grid voltage goes through zero. Under these conditions, it produces an output pulse whose duration depends on the capacitor.
This circuit was obtained in a Hobbyst Handbook from 1990. The circuit can be easily assembled...
CMOS 4046 (PLL) is not very common. In this circuit it generates short pulses to excite a high...
This is one of the many 7400 oscillators we have in our circuit bank. It is crystal controlled and must be...