Clock / pulse generator
Square-wave clock · 1 Hz · output swings GND to VCC · 50 Ω

Try it on the benchThe lab drops it on an empty bench and opens its datasheet card.
Pins
- VCC
- GND
- CLK OUT
Lessons and builds that use it
- D flip-flop
- JK flip-flop
- 4-bit ripple counter
- Synchronous counter (74HC161)
- Shift register (74HC164)
- Inductive load and the flyback diode