LM3900 Amplifier (CB25165E)

This circuit with Norton operation is from an article in Radio Electronics magazine. The gain is given by the resistors.

CMOS 555 With Variable Duty Cicle (CIR088E)
The time the output is high (1) of a TLCSSB in the astable configuration depends on Ra and C. The...
Battery Charger (CB16778E)
The adjustment of the maximum load voltage is made in the trimpot. The circuit is from 1994...
NOR Crossed Gates (CB21500E)
This circuit from a 1967 documentation generates 2.5 Hz signals depending on the capacitors used,...