This circuit was found in American documentation from the 1960s. The operational amplifier is from that time, but the configuration applies to modern equivalents.
This circuit is from an old European documentation, already influencing the unijunction oscillator that...
This circuit for cars of the time was found in a Popular Electronics magazine from the 90s. The...
Found in a Maxim documentation, this 1980s circuit drives 4 LEDs on a bar scale. The circuit does...