We found this circuit in the 1957 Raytheon transistor application manual. The transistor can be a BC558 and the common 6 V relay, just by using this voltage in the supply.
This circuit uses a common diode as sensor. The output goes from 0 to 10 V with the temperature change in...
This circuit allows you to read resistors up to 20 M ohms, converting it into voltage. The circuit is...
Found in 90s Radio Electronics, this circuit is indicated for reading temperatures below zero....