Could use an LM337 with a resistor between the output and the adjust pin, taking the output from the adjust pin. Voltage drop would be 1.25V+dropout voltage as a minimum, or about 3.25V . Harold On Fri, 9 Nov 2001 08:57:42 -0500 Douglas Butler writes: > All of the simple ways I know of have significant minimum voltage > drops. > Basically you need a way to measure the current such as a shunt > resistor. Then you need a pass transistor and an op amp to do the > control. The shunt resistor and the pass transistor will determine > the > minimum voltage drop. There used to be FETs from IRF that had a > fourth > pin for current measurement, but I haven't seen them advertised for > years and I don't remember what they were called. Maybe someone on > the > list knows. > > Sherpa Doug > > > -----Original Message----- > > From: solar [mailto:solar@FREE2AIR.COM.AU] > > Sent: Friday, November 09, 2001 4:58 AM > > To: PICLIST@MITVMA.MIT.EDU > > Subject: [OT]: simple current regulator > > > > > > can anyone help me? > > > > I need to build a simple current regulator that i can wire up > > between a 4.8V > > source and a motor. > > > > The regulator needs to be around 1A and preferably wont drop > > the supply > > Voltage > > > > > > your help is appreciated > > > > Ashley Hansen > > > > -- > > http://www.piclist.com hint: The list server can filter out > subtopics > > (like ads or off topics) for you. See > http://www.piclist.com/#topics > > > > > > > > -- > http://www.piclist.com hint: The list server can filter out > subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > > FCC Rules Online at http://hallikainen.com/FccRules Lighting control for theatre and television at http://www.dovesystems.com ________________________________________________________________ GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for less! Join Juno today! For your FREE software, visit: http://dl.www.juno.com/get/web/. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics