The operational amplifier used in this application is uncommon today. This Raytheon circuit can be designed with equivalent operational and the power supply must be symmetrical.
This circuit imitates the singing of a bird intermittently with the intermittency determined by C1...
This circuit lights up an LED when the temperature exceeds a certain pre-set value and lights up...
Frequencies up to 50 MHz can be produced by this circuit, depending only on the used XTAL. L and...