Najlepsza pozytywna recenzja dla Moduł zasilacza na Banggood Poland|Zakupy Polska

17% OFF Moduł DIY regulowanego zasilacza prądu stałego 0-30V 2mA - 3A US$7.99 US$9.59 View It

Ogólnie:

asct1 17/09/2017

Initially it failed to work once assembled. I found that one of the 1n4148 diodes was bad. This caused it to only give a fraction of a volt, and I am fairly sure it would have burned the opamps especially U2 if I hadn't noticed it was quickly getting hot. I am unsure if the diode came in defective, or failed after installing it, as I did not test it before installing it. I happened to have some so I replaced it, and the powersupply worked after that. I am powering it by a 12volt transformer, which gave an output about 19volts without a load (it would not be able to maintain that with a load). The opamps are said to at best marginally handle the 24volt transformer that is suggested, I didn't need anywhere near 30 volts output, so I went with a 12volt transformer I had, being 12volts is the most I will need for anything I am looking to use this for. I added a resistor to the voltage adjustment pot P1 to limit the top voltage to around 15volts, by narrowing the range it gives finer control of the voltage without adding an expensive 10turn pot.. The most voltage I need is basically 12volts, so I may lower it more for finer control, or add a second pot for fine tuning. I switched out the 7824 for a 7812(with a small heatsink) and used a 12 volt fan blowing down across a reasonably large aluminum heatsink, and added in a lcd meter powered by the 12volt regulator as well (with a flyback diode on the regulator output due to the fan as well, it can be seen on the second picture wired into the power going to the fan). For some reason the minimum current was much higher than the 2mA listed, more like 82mA as is shown in the one picture. I don't know if the 82mA has anything to due with the lower input voltage from the transformer or not. I have worked it down to about 20mA by reducing R17 (the 33ohm resistor). I will probably adjust R18 to limit the current like I did with the voltage for finer control, as I don't need 3Amps (although I may make it adjustable, just in case I need the higher amps someday). The board is very good quality, and beyond having a bad diode nearly burn it up, it seems a pretty good unit for the cost. I really enjoyed building it, short of troubleshooting the diode for a few days. I wish I could work out a way to see what the current limit is set to though, rather than having to reach it and have the led come on.

Komentarze (3)

Zatwierdź

claudiu where did you get the transformer? please put a link. thank you
Odpowiadać 31/10/2017

Zatwierdź
MichiganMike If you live in the US. Jameco is pretty reasonable. https://www.jameco.com/shop/StoreCatalogDrillDownView?langId=-1
Odpowiadać 18/11/2017

Zatwierdź
BG184854824 How many amperes ?
Odpowiadać 20/07/2019

Zatwierdź

Nasza firma	Skontaktuj się z nami	Płatność i wysyłka	Programy partnerskie
O Banggood.com gwarancje i polityka zwrotów Regulamin Polityka prywatności Roszczenia dotyczące własności intelektualnej Mapa witryny	Skontaktuj się z nami Poradnik dla nowego użytkownika Centrum pomocy Sprawy specjalistyczne	Metody Płatności Przewodnik żeglugi Lokalizacje, które wysyłamy przewidywany czas dostarczenia Instrukcja BGpay	Program Fashion Blogger Program partnerski Program hurtowy Upuść wysyłkę Klub recenzji

Nasza firma

Skontaktuj się z nami

Płatność i wysyłka

Programy partnerskie

O Banggood.com gwarancje i polityka zwrotów Regulamin Polityka prywatności Roszczenia dotyczące własności intelektualnej Mapa witryny

Skontaktuj się z nami Poradnik dla nowego użytkownika Centrum pomocy Sprawy specjalistyczne

Metody Płatności Przewodnik żeglugi Lokalizacje, które wysyłamy przewidywany czas dostarczenia Instrukcja BGpay

Program Fashion Blogger Program partnerski Program hurtowy Upuść wysyłkę Klub recenzji