Frequency Base 555 (CB24503E)

This mains-synchronized circuit produces a simple 1 pulse per second. The circuit is from a Radio Electronics magazine from May 1977.

| Clique na imagem para ampliar |

Micro Inverter for 23V Multimeter (CB15853E)
Old multimeters used a 22.5 V battery for high resistance measurements. If you have one, you...
Light Control 2 (CB22102E)
This circuit has an opposite action to the previous one, triggering when light falls on the...
Bargraph Humidity Indicator (CB11519E)
This circuit was found in a Popular Electronics from 1991. The transistor could be the BC548. The...