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xrk971 Desktop Class A (DCA) Headphone Amp
xrk971 Desktop Class A (DCA) Headphone Amp
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Old 14th July 2018, 12:57 PM   #171
xrk971 is offline xrk971  United States
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xrk971 Desktop Class A (DCA) Headphone Amp
That converter requires minimum 9vdc to work properly I think. Try a higher voltage battery or you need a step up from 5v to 12v first.

Here’s the description.

Module name :250W boost constant current module

Module properties: non-isolated step-up module (BOOST)

Input voltage: DC8.5V-48V

Input current: 10A (MAX) exceeds 8A please enhance heat dissipation

Quiescent current: 10mA (12V liter 20V, the output voltage, the higher
the current will increase too quiet)

Output voltage: 10-50V continuously adjustable

Constant] range: 0.2-8A

You can try the MT3608 DC step up they are designed for lower voltage and max out at 24v out. They are finicky though and often blow up if you adjust the pot too quickly. Get several as $1.

Look what I found on AliExpress
MT3608 2A Max DC DC Step Up Power Module Booster Power Module for arduino Diy Kit-in Integrated Circuits from Electronic Components & Supplies on Aliexpress.com | Alibaba Group
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Last edited by xrk971; 14th July 2018 at 01:21 PM.
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Old Yesterday, 01:20 AM   #172
yourownbuzz is offline yourownbuzz
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Oops. Without reading the description I just assumed it would work the same as the little 3608 ones. Still have a bunch of those from the pca - will give those a go! Not sure how such a tiny thing would hold up to the power dissipation
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Old Yesterday, 07:58 AM   #173
yourownbuzz is offline yourownbuzz
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Alright got it hooked up to a 3608 at 23.5v it's drawing 1.5A from a USB port. Seems to be holding up fine. However when I used it to step up to 12V to feed the other step up, it draws in excess of 3A @ 5V. Just have to wait for the 18650 battery holders to arrive to try with batteries
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Old Yesterday, 12:45 PM   #174
xrk971 is offline xrk971  United States
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xrk971 Desktop Class A (DCA) Headphone Amp
That’s strange that current goes that high. I would not run it at 3A it will blow up. Just use it to make 24v and its good for that as 1.2MHz switching grew is way above audio band.
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Old Yesterday, 01:29 PM   #175
yourownbuzz is offline yourownbuzz
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2A seems to be the max output so I guess it can draw however much it wants from the input? Not sure...it did heat up and then I pulled the plug on it. The step up wasn't damaged though.
Yep will leave it running straight off the 3608!
Also took the opportunity to swap in the 10k uF caps , even with the fat chisel it still takes some effort to solder suck the ground pins due to the larger sinking capacity of the board I guess.
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