This circuit was found in documentation from National Semiconductor. The formula next to the diagram allows you to calculate the components used.
This small transmitter with 2 transistors can reach several hundred meters using a 30 to 70 cm...
Built-in Littelfuse itself This SiC N Channel MOSFET for 1200 V can be obtained from Mouser...
This source draws a fixed constant current of 1 mA using a Norton operational amplifier. Other...