This circuit uses a common multimeter on the voltage scale. The calibration of the scale should be done based on transistors with known gains.
In the figure we have a simple thermometer with NTC, using an analog current indicator. The...
The integrated circuit used in this 80's application is not common today. However, modern...
Two 3-terminal regulators like the LM317 can be used to "clip" a sinusoidal signal, in order to...