We found this circuit in a 90s Radio Electronics. The circuit generates frequency-modulated 220 kHz signals. The components used are still common.
This 1.6 to 20 V power supply, with a maximum current of 3.5 A and protection against short...
Using a 555, this configuration appears elsewhere on this site. This is from American...
This circuit is based on an operational window comparator. We found it in a documentation from the...