This circuit uses three inverters to generate a rectangular signal whose frequency depends on R1 and C1. The circuit is from a March 1996 Electronics Now.
This power supply for those who want to feed and recover 5 ¼ floppy disks was found in the...
April 2017 - The kit for STMicroelectronics STM32F7 32-bit microcontrollers is available from...
This circuit was found in an old European documentation, but it is still current due to the...