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.

Touch Switch (CB20417E)
This touch sensor, found in an American documentation on transistors, has gained 8 million times...
2 A Transistor Fixed Power Source (CB15764E)
The block shown in the figure is a basic source with a configuration widely used in technical...
Stethoscope (CB12295E)
The output of this circuit must be connected to the input of an audio amplifier. The microphone is a small...