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.
This very low frequency circuit was found in a 1964 Electronic Design. Transistors may be modern...
We found this circuit in the October 1992 Radio Electronics magazine. The frequency is given by C1...
Found in the book 303 Circuits, this circuit compresses signals from 25 mV to 20 Vpp to...