Search results

Search Forums New Posts
  1. S

    Convert 0-30V 3A PSU to 5A or more

    I am also going to build a PSU, maybee its going to be this one, at the moment i dont have a PSU worth the name, it can only deliver 1 Amp at 12 Volt maximum. I have purchased a toroid transformer rated at 24V/10Amp, 240 VA,an expensive one. I also have a suitable box for it. But at the moment...
  2. S

    Convert 0-30V 3A PSU to 5A or more

    Btw FireFly, have you buildt this PSU?
  3. S

    Convert 0-30V 3A PSU to 5A or more

    I belive we have to wait a little for Mixos to test his PSU. Btw Mixos, have you tested your PSU yet? For 30Volts/3Amps PSU i belive a 24 or 25 Volts/100 or 105VA transformer should be okay, but there is an another problem if you rise the voltage of the transformer too much, to get more headroom...
  4. S

    Convert 0-30V 3A PSU to 5A or more

    Ok, i will try to explain things, but its not easy for me, i'm not so good in the english language. You have the data for the 2N3055 on your site, named MJ2955.pdf . If you look at figure 1 in that document you see that the maximum allowed dissipation power is only about 50 Watts at 120 degree...
  5. S

    Convert 0-30V 3A PSU to 5A or more

    Hi there MP, have you also built this PSU? I see you are a moderator, so i belive you are a friend to Mixos. P2 is set between 0.0094 and 1.41 Volt to achieve a current limit between 0.02 and 3 Amps. What is T1? I dont see it anywhere in the schematic. Maybee you mean the power transformer, of...
  6. S

    Convert 0-30V 3A PSU to 5A or more

    Where shall we start? First i will say, i have buildt several hundred PSU:s, so i have some experience about PSU:s. I belive we start with the current PSU, the 3 Amp, and its drawbacks. First the 2N3055, yes, it is rated at 15 Amps, so thats not the problem, its the power disipated in this...
  7. S

    Convert 0-30V 3A PSU to 5A or more

    Okay, i belive this is a good PSU, but it have a few drawbacks! Lets discuss it and how to change it to be one of the best PSU:s on the internet. Has any actually buildt this PSU and tested it? Really tested it! What was the ripple at 30V / 3Amp output? And what happens when you try to get 3 Amp...
  8. S

    X-mas

    Jag vill önska er alla en riktigt God Jul I like to wish you all a very merry Christmas //Staigen
  9. S

    CAD Program opinions

    ExpressSCH is a part of ExpressPCB. And i dont think there is an evaluation version, only full version, but i can be wrong! ExpressPCB is freeware, i belive. You can download it here from Electronics Lab, under Downlads. //Staigen
  10. S

    CAD Program opinions

    To make scematics i use ExpressSCH, its easy to use and learn and it is fast to create a scematic. For making PCB:s i still evaluate a few programs, but i dont like non of them, and ExpressPCB i think is useless. At least if you want to make your own PCB:s. //Staigen
  11. S

    0-30 Vdc Stabilized Power Supply

    I also have a few sugestions for this circuit, but also a warning. First i sugest that you bypass the diodes D1 to D4 with a couple oh caps, about 1nF to 4.7 nF, soldered directly over the diodes. Also bypass diode D7 with a cap, lets say 10 MFD to 47 MFD. The supply to the IC:s should also be...
  12. S

    ExpressSCH components

    Here is version 1.0 : ExpressSCH_Components_V1.0.zip
  13. S

    ExpressSCH components

    I have designed a few components for the ExpressSCH. Maybe somthing for others to share? Can I upload it to you, or shall i send a link to my homepage? //Staigen
  14. S

    Forum at Techlib.com is back

    The forum at Techlib.com is back again! Urls: Techlib.com: http://www.techlib.com/ The forum: http://www.techlib.com/disc5_frm.htm //Staigen
  15. S

    Service Manual for Hewlett Packard 1024

    Oops! I forgot, its a monitor :o ::) //Staigen
  16. S

    Service Manual for Hewlett Packard 1024

    I need a Service Manual or shema for a Hewlett Packard Ergo 1024 Model D2831A //Staigen
  17. S

    DTMF transceiver connection

    Ok, BTW, you can connect the transformer directly to the phone line via a relay or something, thats the way modems are connected. //Staigen
  18. S

    DTMF transceiver connection

    Ok, i am not so good at the english language, but you did not answer the question! And its transmitter, not transmiter //Staigen
  19. S

    DTMF transceiver connection

    I know what DTMF is, i have known it for about 30 years now, what i was curious about was what a TRANCIEVER is used to //Staigen
  20. S

    DTMF transceiver connection

    What is a DTMF tranciever used to? Just curious! //Staigen
Top