Using a 4046 PLL, which is uncommon today, this circuit was found in the October 1994 issue of Electronics Now magazine. The circuit can be modified by changing the capacitor.
We found this circuit in 2005 Linear Technology documentation. The integrated circuit is LT1787...
This circuit counts from 1 to 10 or 0 to 9 using as indicators common LEDs. The circuit can be...
We found this circuit in a Popular Electronics of the 90s. The circuit still uses light bulbs, but...