2MHz astable (CB9102E)

This TTL circuit can be used as a shield. The frequency can be changed by changing the capacitors.

High-pass active filter (CB20934E)
This circuit is from National Semiconductor documentation. The operational amplifier is of the...
Operational with Hysteresis LM309 (CB15103E)
In the figure we have the way to add hysteresis to an operational amplifier. The relationship...
Regulation of 0.005% (CB1538E )
This circuit, from an American publication of 1974, provides a 0.005% regulation with a variation of...