This circuit is from a manual from the 80's and the operational one used, uncommon nowadays, can be replaced by a modern equivalent. The power supply must be symmetrical.
This circuit was obtained from a Hands-On Electronics, an American magazine from January 1987. The...
This circuit is from 1972 documentation. The circuit detects when the voltage input is in the...
This circuit generates a 5.3 kHz linear ramp with the indicated components. The 7555 is the CMOS...