The circuit shown in the figure below is from the 1993 Linear Technology Applications. The operational ones used are uncommon and the use of equivalents can be analyzed.
This circuit operates with frequencies from 0.5 to 400 MHz. We find it in a 90’s NASA...
This oscillator for Morse code training was found in a Popular Electronics from the 90s. The...
This low power metronome produces pulses in a small loudspeaker. Pule rate is adjusted by P1 and...