Found in documentation from the 1980s, this circuit can have several adaptations to use modern transistors and LEDs instead of the lamp. The power supply voltage can also be changed.
This circuit with an industrial standard 4-20 mA interface uses a KPZ20G pressure sensor but can...
This inverter with the 555 IC provides a high voltage output, but very low current. We found it in...
) The purpose of this circuit is to increase the sensitivity of an indicating instrument. We found it...