Undervoltage detector with the LM3900 (CB25172E)

The figure shows how to implement an undervoltage detector using a Norton amplifier and a zener diode as the main elements.

Fiber Optic Receiver (CB14601E)
This circuit was found in the Linear Technology Applications of 1997. The circuit uses components from...
Walkman Power Supply (CB17969E)
This is a 5 V power supply from 2002 documentation, suitable for walkmans and diskmans, common at the...
Bidirectional ramp generator (CB8934E)
In fact, this 1967 Electronic Design circuit generates two symmetrical ramps whose frequency...