This circuit is from 1999 documentation. The integrated circuit used is not very common today. Both transistors are used if the motor current is greater than 500 mA.
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....