Current indicator (CB22132E)

In this circuit the voltage across the LED is limited by the diodes. The maximum current also depends on the resistor.

Frequency Doubler (CB13738E)
This circuit, obtained from old documentation, doubles the frequency of the pulses applied to the...
Shadow Activated Motor (CB15459E)
The passage of an object in front of the LDR, producing a shadow or even turning off the ambient...
Basic Monostable Using the 7555 (CMOS) (CB120E)
The CMOS TLC555 [equivalent to the bipolar 555] can be used as a monostable in the configuration...