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17% OFF Module d'alimentation régulée réglable de 0-30V 2mA - 3A DIY Kit 7,45€ 8,94€ View It

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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...

Commentaires (10)

Soumettre

Can you post a diagram showing your mod with 7805 and LTC660?
Répondre 22/07/2015

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

Soumettre
freds post serveral times the schematic of modification, but banggood will not post it....
Répondre 18/08/2015

Soumettre
Orbital69 Maybe put up a dropbox link or something? Cool findings by the way.
Répondre 20/09/2015

Soumettre
tobiasch Can you please post your schemativ from your mod at dropox or equal?
Répondre 12/12/2015

Soumettre
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
Répondre 23/12/2015

Soumettre
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
Répondre 23/12/2015

Soumettre
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
Répondre 23/12/2015

Soumettre
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...
Répondre 23/12/2015

Soumettre
luckis in the place of the 1047 put the TIP3055
Répondre 23/12/2023

Soumettre

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Contactez-nous

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A propos de Banggood.com Garanties & Politique De Retour Conditions générales de ventes Politique de Confidentialité Droits de propriété intellectuelle Plan du site

Contactez-nous Nouveau Guide de l'utilisateur Support Affaires spécialisées

Moyens de Paiement Guide de Livraison Jusqu'où livrons-Nous? Délai de Livraison estimé BGpay Instruction

Programme Blogueuse Mode Programme d'affiliation Programme de Vente en Gros Livraison directe Club d'avis