In message <5eeda4c205090323519deb263@mail.gmail.com> Vasile Surducan wrote: > I don't know well the MAX724/726 but every feedback could be realised > in two ways: feddback from the output voltage, resitive network > divider from the reference voltage to the amplifier error input (and > here a digital potmeter could work ok), both of the previous methodes. The 72x uses a resistor feedback circuit to control the output voltage. > Because you're thinking wrong. If you have a variable reference > voltage why you should convert it into variable resistance? Forget > about using the MAX724. Guess I will then.. I'm after some form of switchmode regulator though, one I can vary the output voltage on... I'd use a linear reg, but at 30V drop and 5A load, they get REALLY hot... Later. -- Phil. | Acorn RiscPC600 SA220 64MB+6GB 100baseT philpem@philpem.me.uk | Athlon64 3200+ A8VDeluxe R2 512MB+100GB http://www.philpem.me.uk/ | Panasonic CF-25 Mk.2 Toughbook ... How come all the buttons keep flying off my shirt? -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist