Blown Fuse Alarm (CB6109E)

We found this circuit in a 1967 Electronic design. However, it can be easily implemented even today as it uses only common diodes.

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Touch Switch (3) (CB12188E)
We found this circuit in an English publication from 1980. It provides a logical output signal when...
Electret Microphone Amplifier (CB15643E)
With the circuit shown, we have an excellent level for the signal obtained from an electret...
Old Phase Shift Oscillator (CB13956E)
The circuit presented was found in a documentation from the 1950s, generating a sinusoidal signal...