As the description says....0-10V @100mA, input is 24VDC So the way I see choices are: Micro with PWM output driving an opamp (+24VDC rails...cable driver maybe?) DAC driving a opamp again Adjustable LDO - using a digital pot to adjust the ouput (micro drives over= I2C) So what might the forum choose?=A0=A0=20 --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .