Found in Radio Electronics from the 90s, this thermometer uses an integrated circuit that is unusual today. The sensor is a thermistor or NTC.
We found this circuit in a 1967 General Electric SCR manual. The time is set to R1 and depends on C1...
This circuit uses an ignition coil to generate the high voltage that electrifies a fence. However, in...
Found in an older Radio Electronics, this circuit generates signals that can be used with regular...