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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Automatic Frequency Control (CB4101E)
We found this circuit in an old documentation for hams. In it we have the way to use a varicap to...
Crystal Sinusoidal Oscillator (CB5129E)
Found in an 80's documentation this circuit uses an integrated from the uncommon era today. Other...
Sinusoidal Oscillator 741 (CB14904E)
This circuit is stabilized by a thermistor or NTC with a resistance between 2 and 5k. The signal is...