The Kolonel

Hello Audioguru, The high voltage opamps aren't really needed, the supply works perfect...no problems untill now. For Q2 I use a BD137 beceause I hadn't a 2N2219 in my stock. I've mounted a little heatsink at the transisto and it works good,doesn't get too heat at all... I'l check one of these days if I can measure the 18mV noise at the output with my scope... BTW, is there someone who has built the LCD panel meter for this supply? Witch are the results? Greetings T.K.

Hello subodhthok, I've been building this circuit last week, I can tell you that it works perfect. But, there are some thinks that I have changed in the original circuit. In stead of using three TL081 IC's, I've been using one LT081 IC,U1 in the scematic, and an LT082 IS for U3 and U2 (same supply voltages...). The TL082 is an Dual JFET Input Operational Amplifier. This works great, and you don't need to add RV1 and R10 to the circuit, these are unnecessary if you use the TL082. There also a little note you need to keep in mind... The maximum supply voltage of an TL081/TL0872 is about a 36Volts (+/-18V). In the circuit, the supply voltage of these IC's is around a 38Vots (positive maximum of the tranfo= 24V*1.41, neg voltage =-5.6V). Further... there is a 2N3055 transistor used as power transistor. The worst case powwer dissipation of this transistor =90W (30V*3A). When you check the thermal design, you will see that the junction temperature can rise to 250