This circuit for the VHF band of analog TV was found in Motorola documentation from the 70s. The integrated circuit used is uncommon today.
This common transistor-based circuit provides power for 20 mA common white LEDs from a single 1.5...
This circuit, from an old Argentine publication, makes it possible to use a 1 mA full-scale...
This active crossover filter was obtained from the component manual used. Below is the performance...