Found in General Electric documentation from 1967, this circuit uses an unusual PUT today. The frequency depends on C1.
This other high stability thermocouple amplifier uses an 80's operating. The circuit can be used...
In this circuit we have the voltage multiplied by 5, obtaining between 50 and 80 V output when the...
This circuit shows that we can implement a voltage-controlled oscillator with almost any CMOS that...