This circuit was obtained from the February 1992 Radio Electronics magazine. In it, a bar of 4 LEDs flashes continuously at a speed given by C1 and the setting of R3.
This circuit operates with frequencies from 0.5 to 400 MHz. We find it in a 90’s NASA...
CMOS 4046 (PLL) is not very common. In this circuit it generates short pulses to excite a high...
This circuit to produce clock pulses is manually driven. The circuit is TTL and must be powered by 5...