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irishron40
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Joined: 22/09/2014
Location: Ireland
Posts: 251

Posted: 08:29pm 07 Dec 2021

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hello ,

i bought a large quantity of those battery operated micro led string lights
these have 160 micro leds on a silver wire which are operated by a battery operated control box which has 8 functions
on the 8 function all led stay lit insted of every second one.
I have about 15 of these string light joined together onto one controll box
i have multiple string lights cut from their controlbox and connected together onto one controlbox.

instead of using the 3 AA batteries I want to connect it to 3.2 volt from power supply.

if I connect the led strings strait to the power supply they lite up nice and bright.

but when I connect the controlbox to the 3.2 power supply the are very very dim.

its like as there is a current limit on the wee board inside controller.

I do need to use this controller as I want all LEDs to light up on function 8, and not every second one which would happen without controller.

I upload this littel circuit board as there is a silver resistor with two connections on one side.

I tested this with ohm meter and reading was 7 M

would this be the problem ??

thanks for reading this and hopefully someone which I dont doubt has a solution for me

regards

ron

Murphy's friend

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Joined: 04/10/2019
Location: Australia
Posts: 648

Posted: 05:29am 09 Dec 2021

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3 x AA batteries is 4.5v nominal. Set your power supply to that voltage.

phil99

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Joined: 11/02/2018
Location: Australia
Posts: 2135

Posted: 06:41am 09 Dec 2021

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"there is a silver resistor with two connections on one side."

That is the clock crystal for the controller chip on the other side. The meter reading you get seems about right.
As noted above the supply will need to be at least 4V, fresh batteries could be up to 4.8V.

A 5V supply should be ok but don't go any higher.
Edited 2021-12-09 16:44 by phil99

irishron40
Senior Member

Joined: 22/09/2014
Location: Ireland
Posts: 251

Posted: 10:10pm 10 Dec 2021

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above 3.2 volt the function selector wont work.

phil99

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Joined: 11/02/2018
Location: Australia
Posts: 2135

Posted: 10:45pm 10 Dec 2021

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It is clearly designed for 4.5V and the LEDs need that, but wont work above 3.2V.
You have an unsolvable problem, short of getting a new one.
Read the type number on the chip and search for a data sheet for it. Maybe there are some clues there. Does the button need to be pressed while switching it on to get it into programming mode at the correct 4.5V? Search for an instruction sheet.

irishron40
Senior Member

Joined: 22/09/2014
Location: Ireland
Posts: 251

Posted: 02:32pm 11 Dec 2021

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Sorry, what I mend was that I can not select flashing function above 3.2 volt input.
The leds work fine above 3.2 when connected to power supply.

First 7 functions it switches between every second led. On function 8 all leds will be lit ,which is what I want.

When all are lit my voltmeter reads an AC output

Thx everyone

Ron

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