Driver for piezo micropositioner (CB8118E)

Found in an Electronic Design from the 90s, this circuit uses a component of the time, difficult to obtain today.

Experimental AM Receiver (CB17018E)
This good receiver contains 6 coils wrapped in ferrite rods. L1 has 20 turns of wire 28 and L2 /...
8-output phase shifter (CB8152E)
Found in a 1967 Electronic Design, this circuit changes the phase of a signal in 8 different ways, given...
Low battery indicator (CB21619E)
Based on an Analog Devices LTC1540, this circuit consumes only 50 uA, serving to monitor the...