In the figure we have a simple thermometer with NTC, using an analog current indicator. The adjustment is made in the trimpot and the power is done by batteries.
This circuit uses a JFET, which may be of the type BF244 or BF245 and a PNP bipolar that may be...
This project was found in a 1982 documentation. Super-regenerative receivers can combine great...
Using two transistors, the resting current for this alarm is 25uA. The circuit was found in an...