The integrated circuits used in this thermometer are not very common today. The indicator is a microammeter for a scale from 0 to 100o C. The supply must be made with a voltage of 1 to 12 V.
This circuit is from a 1991 publication. The integrated circuit used is an integrated radio from...
This receiver for listening to the TR-23 phone was manufactured in Japan in the 1960s. The circuit is...
Found on a 1965 Radio Electronics, this circuit fires a signal xenon lamp applied to the SCR from...