What are the input and output voltages on these regulators? You dissipation is roughly (Vin - Vout) * I(load). I assume dc regulators. Uri ----- Original Message ----- From: "Tal Bejerano - AMC" To: Sent: Thursday, May 30, 2002 11:01 AM Subject: [PIC]: Need help with a stupid problem > Hi 2 All > > Attached file as you can see its a small and simple psu. > this device produce heat to much, it only supply to a opamp about 10-15mA . > the regulators are very hot as well the input capacitors. I use large caps' > 2200uf each (not 1000uf as in the schematic. could it be the reason for the > heating? > just let me mention that it's a phono pre-amp so I use so large caps. > furthermore the transformer is 220v-2x18vac > > Regards > > Tal Bejerano > AMC - ISRAEL > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body