This circuit was found in a 1980s documentation. The circuit uses common components having an output of 10 Hz per centigrade degree of variation. The sensor is a transistor.
Texas Instruments LMV3xxA operational amplifiers are low voltage types (2.5 to 5.5 V). In the...
This circuit was found in old documentation, but the transistor may be the modern equivalent BC547....
This circuit can be used in panel signaling with common incandescent lamp. The lamp will flash at a...