Moving hole with the 4017 (CB25433E)

This circuit is from a Radio Electronics magazine from February 1992. The circuit has the effect speed dependent on C1 and adjusted by R3.

| Clique na imagem para ampliar |

One Transistor DC Voltmeter (CB868E)
This simple circuit uses a 200 µA galvanometer to measure voltages in three ranges. The circuit...
1 to 100 Mark Space 555 CMOS (CB15860E)
To obtain a large brand / space ratio, for example, from 1 to 100, we can use the TLC7555 in the...
1-Transistor Super Heterodyne (CB23718E)
This interesting circuit with just 1 transistor was published in Radio Electronics magazine in...