Dc-Dc "booster"

[Flump]

i have a variable 13.8v dc powersupply but needed higher voltage to test some zeners with
so i bought this http://www.ebay.co.uk/itm/DC-DC-150W-10-32V-To-12-35V-Power-Supply-Boost-Adjust-Module-Mobile-Laptop-Car/190851387499?_trksid=p2045573.m2042&_trkparms=aid%3D111000%26algo%3DREC.CURRENT%26ao%3D1%26asc%3D16581%26meid%3D1850030650965224091%26pid%3D100033%26prg%3D7839%26rk%3D1%26rkt%3D4%26sd%3D190851387499%26

if you have the input voltage at 9.6v the output shoots up to just over 45v and one of the
electrolytic burst lots of stinky smoke at 2am i crapped myself lol

just a heads up to anyone else thinking about getting one of these

[sleemanj]

if you have the input voltage at 9.6v the output shoots up to just over 45v and one of the
electrolytic burst lots of stinky smoke at 2am i crapped myself lol

just a heads up to anyone else thinking about getting one of these

Are you sure you didn't make a flub, like shorting it, back feed, or reverse polarity?

What sort of load did you have on the output?

I haven't used that particular model, but the cheap chinese DC-DC converters on eBay (despite being cheap chinese) generally do what it says it will if treated right.

[Flump]

yeah no flub lol

it also reaches the same overshoot voltage when you turn the power supply on
and it slowly drops down to what it should be.

no load on the output, just connected to my bench dmm,
the caps are rated at 35v

[G7PSK]

I have several of those, I use them to charge 24 Volt gel cells from 12 volts in a car, work fine for me I also have one that goes to 90 Volts that I intend to use in an old valve radio that runs on batteries 90 volt batteries are no longer available and as there is room inside for a big glass lead acid 2.5 volt for heaters I intend to put a small 12 volt in and bost for HT and have a buck for LT.

[Flump]

You guys that have them do you know if the voltage overshoots when you first turn the
power supply on if its connected up ?

[Christopher]

Test with various loads, scope directly across output (no big gnd probe) on turn on. A small over voltage is pretty common for cheap crappy ebay DCDC (I mean look at the PCB routing... pretty crap)

DC-DC need a minimum load (DMM doesnt count), though most of the time they work with no load..