akademiker

works awesome, thank you very much! Next on my list: Upgrade to 8A version ;D P.S. use PTC! They limit the output current in case of a transistor melt down

upgraded the psu and put in the 3 TLE2141. Pin 3 of U2 has now an input voltage from 0-11,2V, just like it has to be, but the output voltage at pin 6 of U2 is 33V when voltage at Pin 3 of U2 is higher than 0V and is 0V when Pin 3 of U2 is 0V. When the output voltage of pin 6 is 0V, then the voltage at the output of the power transistors is 3,5V. The across pin 4 and 7 of U2 is 35V. Please help, i have no clue ??? EDIT// Nevermind, forgot to connect the Cathode of D11 (the Minus -) to the +-Output Works like a charm, although it is only decreaseable to 100mV but I dont care :D :D :D :D

Ah, finally found it, I mixed up the collector and emitter of the PNP transistor, can't believe I was that stupid, I should really use PNP more often ::) I guess this explains most of the led problems in this topic. Of course i choosed one with 5mA, now my psu should finally work and with the new op amps even better. Thank you very much for your patience!

Q4 was broken and is now a diode :D so i need to increase the resistance for the diode? you're right, i got a 1,3W diode, i'm gonna buy a 500mW tomorrow TLE2141CP 3 of 3 part(s) Shipped 10 Feb 2010 i love Texas Instruments :D

Hi guys, i assembled the first version of this p.s.u. and found the improved version just today, sampled the TLE2141 today and then i will update my board. But my first version does not work: Potentiometer for voltage regulation only changes the voltage from 34V to 17V when he hits zero ohm, also the led is glowing the whole time and when i set the current pot to nearly full limitation and add a load it glows brighter. Also the voltage at D8 (the 5,6V Zener Diode) is only 4,6V and the output of U1 is 9,2V. Are my TL081 broken or don't they work on this voltage correctly, U3 and U2 have about 39V and U1 34V? (I tested them in a test circuit afterwards, seemed not to be damaged). thank you in advance