Another Cheap bench power supply thread...

Flashlight Modding and DIY Parts
1

i want to get a cheap power supply to test drivers and emitters and LVP values.

I’ve come up with 2 possible solutions:

1. Get one of these attach a usb cable to the inputs, then I can power it with a phone charger and possibly adjust the current by using either a 2.1amp phone charger or a 1.0amp charger.

2. Get a cheap Tattoo power supply

2

This might work for you. I do not own one but the reviews look ok.

http://www.banggood.com/DC-LED-Digital-Controlled-Step-Down-Driver-Power-Module-p-910096.html

3

Thanks! Unless somebody suggests something better in the next few hours, I’ll be ordering one of those

EDIT: It was available in the US warehouse, so $14.99 - 8% “NewUS” coupon = Good deal

4

review / instructions here: https://www.youtube.com/watch?v=S_KjmF1iI9w

Let us know what you think of your new power supply pls.

5

Can I talk you into a real adjustable power supply for more money? It saves you a lot of time fiddling around with making a test set-up work, makes you pay more attention to what you actually want to measure. I do not have one but this one seems to have a great price/quality ratio:

http://m.banggood.com/CPS-3205-0-32V-0-5A-Portable-Adjustable-DC-Power-Supply-110V220V-p-934530.html

Once you have one, you will find many more uses for it, an adjustable power supply is just a great thing to have around.

Unless the messing around with the cheap DIY stuff is part of the fun, of course ;-)

6

That’s nice! Me want!

7

Just a thought, a super cheap ~$6 laptop charger at 15V or 19V and 3-5A might give you a more versatile power supply out of that thing (since if you power it off of a USB port it’ll never be able to output more than 5V - whatever the dropout is, so maybe 4V or 4.5V). In fact, there are printer power supplies in the same power brick format that go up to at least 36V (something like this).

8

I’m not going to be doing enough testing with it to spend that much.

I don’t do emitter tests or anything like that.

It’ll be used for

1. Testing driver function
2. Checking adc values
3. Testing cut-off voltage for my lighted tailcaps.

The $15 one in post #2 looks perfect, already ordered.

9

Btw, I’ve come across some other models in the same line as the b3603, there is the b3606 (which does 36v, 6amp out) and also a b3008 (30v, 8amp, $25 inc s/h on dealsmachine) and I am sure there must be others.

If banggood hadn’t shipped my b3603 within 20minutes of ordering, i probably would have cancelled and got the b3606 instead.