Hallo, I'm new in the field of electronics. I'm working on a study project to control the heating power supplied by the PTC ceramic heater. The specifications of the ceramic heater are (12 V/DC 150 W, 15A ). Here is the link of the heating element http://www.conrad.de/ce/de/product/532894/Heizelement-12-VDC-150-W-L-x-B-x-H-90-x-27-x-17-mm As far as I understand basic circuits, the steady current of 15A must be provided to the load (Ceramic heater) all the time. But I can apply variable voltage input. This could help me to get variable heating power, e.g, from 0W, 45W, 75W, 150W by changing the input voltage to 0V, 3V, 5V, 10V. I can measure both the voltage across the heating element as well as the current flowing through the circuit. The problem, however, I'm facing is that the module I got to interface with the heating element is either an analog output module with (-10V to 10V, 20mA) output or a PWM module (18V to 48V, max 2A). Since, the modules do not match my loads , so I can't connect them directly. Does any of you know how can I realize an interface to connect either my PWM module of Analog I/O module, whichever possible, to the Ceramic heater? Many thanks for your suggestions. Regards,