The TAA865 integrated circuit used in this 1986 project is no longer common today. The circuit is a documentation of the time and the time is given by RC that has indicated the maximum values.
This circuit, shown in the figure, can operate from 4 to 100 MHz, based on a 2N2222 transistor or...
We found this circuit in a 1988 publication. A touch of the sensor causes the relay to trip and...
This dual flasher for high brightness LEDs was found in an American documentation from the 90's....