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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Nicad Charger for car (CB4792E)
This circuit was found in a Popular Electronics of the 90s. The resistor R4 determines the load...
2 to 6 W amplifier (CB8305E)
Obtained from a 1980s Signetics documentation, this circuit uses a common integrated circuit at the...
Digitally Controlled Filter (CB14368E)
We found this circuit in the Linear Applications Handbook by National Semiconductor. The circuit is...