Precision Current Source (CB21052E)

Found in National Semiconductor documentation from the 1990s, this circuit employs basic components from the time.

| Clique na imagem para ampliar |

Flame Detector (CB17581E)
This circuit detects the presence of a pilot flame in heating systems by the presence of infrared...
SUS Frequency Divider (CB19903E)
In the figure we have a circuit that uses unusual components, being indicated for low frequency...
Triangular and square generator (CB21449E)
Found in older Signetics documentation, this circuit generates signals from 30 Hz to 25 kHz....