Search results

  1. Sallala1

    0-30 Vdc Stabilized Power Supply

    Ehh, I solved my problem. 1. I measured wrong the 2n3055. But is still dead. There is a split between it's emitter and base. 2. I think it was wrong before I soldered it. (I have got three 2n3055 at home. I remember, once I test one of them. Maybe this was, beacuse I remember it's red painted...
  2. Sallala1

    0-30 Vdc Stabilized Power Supply

    OK, I unsoldier the 2n3055 and the circuit now 0-31,5V again. I'm happy, that my opa455"s  alive :-) The 2n3055 have a split between it's collector and base. But what happend? It's a very big problem, when the 2n3055 go wrong, the output jump to 13v isn't it? If I use the supply for an...
  3. Sallala1

    0-30 Vdc Stabilized Power Supply

    Hi! Finally I built the circuit. It started working and I was very happy. Without a load, I can adjust the voltage from 0-31,8V, tested with a multimeter. I use an old 32VAC transformer. The DC voltage is 46V at the rectifier. The negative supply is -5V exactly. I use OPA445 it's max supply...
  4. Sallala1

    0-30 Vdc Stabilized Power Supply

    Hi all! I'm, who start this topic some years earlyer. My parts are in a box one years ago, now  there is the time to build the PSU. :-) I think, I visit the topic, before start building. It was a good idea ;) I readed through the topic. Thank you everybody, who help to correct the circuit...
  5. Sallala1

    0-30 Vdc Stabilized Power Supply

    Thank You! Exactly: +-5V AC, or +-5V DC? But maybe I must buy a tranformer, I haven't got a 3A one at home. When I ready with the circuit I will add comments.
  6. Sallala1

    0-30 Vdc Stabilized Power Supply

    I plan to build this project: 0-30 Vdc Stabilized Power Supply With Current Control 0.002-3 A http://www.electronics-lab.com/projects/power/003/index.html My question is that I must supply this circuit exactly with 24VAC, or I can differ? So in what AC input voltage intervallum can I use this...
View older results
Top