Half Wave Fast Rectifier (CB5160E)

This 80's circuit can be made with current comparators. Rectification accuracy is 1% DC up to 100 kHz.

7-segment LCD driver (CB7556E)
Found in American documentation from the 90s, this circuit uses TTL technology and is therefore...
Phone Status Monitor (CB5977E)
We found this circuit in an old documentation, but the components used offer no difficulty in obtaining...
CW Micro transmitter (CB4051E)
This transmitter has the frequency that depends on the crystal. We find it in a 1980s...