Microphone preamp (CB22043E)

This preamp was found in an old English publication. Any usage JFET can be employed. The output is high impedance.

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...