Crystal oscillator (CB9637E)

Found in a 1980s American documentation, this circuit has a current consumption of only 1 mA. The crystal can be from 100 kHz up to a few megahertz.

| Clique na imagem para ampliar |

Simple ohmmeter (CB23622E)
Combined with the two previous circuits, we can create a simple multimeter with this circuit. The...
Amplifier for instrument (CB21328E)
This 1.5V instrumentation amplifier was found in National Semiconductor documentation from the...
Bulb Saver (CB16631E)
This simple circuit helps to save incandescent lamps by leaving their filament slightly heated and thus...