This circuit uses a transistor as a sensor and operates in the range of 0 to 50º C. We found it in old documentation. Operational equivalents can be used.
We can use high value electrolytic capacitors in alternating current circuits with the...
In the figure we have the way to use power transistors as rectifiers in a source, replacing common...
This circuit can measure frequencies up to 10 kHz using a digital multimeter or the 7107. The...