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freds 21/07/2015
ordered 3 of these cheap pcb's, all workt perfect after a few hours of soldering. Now the main test: the transformer is a 24v ac 90 watt the load is a 10R / 50 watt resistor, I put voltage to 20Volt that's 2amps, all 3 blew up after some while...3x the 2sd1047 broke down, after replacing the 1047 on 1 of the pcb's and again testing 2 of the tl081 blew up... After checking the schematic I see that the tl081 gets almost 30 volt and -5 at power pins, that is nearby max of ic...So I changed this, now the tl081 gets +5 and -5 at power pins... next change put 2 1047 in parralel with an extra resistor 0.33R in the emitter line....all works perfect now, but watch out, if you going to use 3 amps out of this power supply this is near the max of used parts, it can get you into some nice firework, so don't go over 2.5 amps.....Than another nice mod. take out the parts that make the -5 volt that fed the tl081's, than use a 7805 and a ltc660 (or similar) and fed the 081's with the -power with the mod. Now you can also use a dc powersupply for fed this pcb....And make sure you cool the 2sd1047, I use an old 478 + fan intel cpu cooler.... It's a fun project to build, has some flaws but can easily be fixed...
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Комментарии (10)
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  • Can you post a diagram showing your mod with 7805 and LTC660?

    Ответить 22/07/2015
  • Very interesting your mods. Is there a schematic available how to do this?

    Ответить 22/07/2015
  • freds post serveral times the schematic of modification, but banggood will not post it....

    Ответить 18/08/2015
  • Orbital69 Maybe put up a dropbox link or something? Cool findings by the way.

    Ответить 20/09/2015
  • tobiasch Can you please post your schemativ from your mod at dropox or equal?

    Ответить 12/12/2015
  • freds for who interested, Iput some pictures on my homepage: http://fred-wester.nl/Power_supply.html or schematic of mod only: http://fred-wester.nl/images/psu_mod_banggood01.JPG

    Ответить 23/12/2015
  • freds The schematic of mod. for use with a dc (switched power psu) at my homepage: http://fred-wester.nl/Power_supply.html or schematic directly: http://fred-wester.nl/images/psu_mod_banggood01.JPG

    Ответить 23/12/2015
  • freds and again I can't post a link to my homepage or dropbox ....The post will disapeare... you can try via google to search on fred-wester.nl and than check out my site and look for "power supply" in de menu

    Ответить 23/12/2015
  • freds Sorry people, banggood will remove any post with any link to a site, dropbox of what so ever...It's just impossible to put a link in the post...

    Ответить 23/12/2015
  • luckis in the place of the 1047 put the TIP3055

    Ответить 23/12/2023
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