This circuit is from 1980s documentation. The maximum operating frequency is 3.5 MHz. The current of the LED can be from 0 to 100 mA. The integrated circuits used are from that time.
This is a traditional complementary-output transistor amplifier sourcing 2 to 4 watts to a 4 ohm...
This is the conventional application of the UCN4202 to control a 12 V stepper motor with current...
The three-terminal positive voltage regulators, such as those in the 78 XX series (where XX is the...