9 V to 5 V converter LT1175 (CB14616E)

We found this circuit in the 1997 Linear Technology Applications. The components used were common at the time.

Complex Sound Generator (CB21237E)
Using LM3909 integrated circuits, this circuit was found in an American documentation from the...
Full cup detector (CB6956E)
This circuit was found in Popular Electronics. Its purpose is to warn the visually impaired when a glass...
High speed sample and hold (CB8879E)
Found in a 70’s documentation, this circuit can operate with signals up to 10 MHz. The operational...