Circuit

[rene']

Dear all, I require your kind help with this circuit - can you help me understand what it is pls & its use? (photos attached) Thanks in advance.

 

[Les Jones]

Some background information would be a great help. Is it part of some piece of equipment or did you just find it by the side of the road ? It would also help if you made more effort to focus the camera so the part number could be read on the IC. From the fact that it has an inductor and an IC that could be a switching regulator I think it will be a step up or step down switching regulator module with a display of the output voltage or current. (Or both.) The fact that the capacitor near the input terminals is a higher voltage rating then the one near the output terminal points to it being a step down regulator.

Les.

 

[rene']

Thanks Les. Actually yes, almost right Almost found by the side of the road as it was mailed to me by mistake (wrong ebay order shipped... So i'm trying to see whether it is useful for something rather than throw it away.)
Correct - I agree with you. Meanwhile I've googled a bit and I think it might be a sort of Step-down Converter Module LED Voltmeter Power - as per link:
https://www.ebay.com/itm/LM2596-Buc...623?_trksid=p2349526.m4383.l4275.c10#viTabs_0
Attached some photos - sry could not get the writings clear
What I need to discover the max input voltage and how it work (instead of thrashing it).
Thanks again in advance.
rene'

 

[Les Jones]

As the input decoupling capacitor is rated at 50 volts then the maximum input voltage must be less than 50. (I would not go above 40 volts.) I suggest that you look at the data sheet for the regulator IC to see if that has a lower voltage rating.

Les.

 

[rene']

Many thanks Les Regretfully no data sheet provided whatsoever. Thanks again.
rene'

 

[Nigel Goodwin]

Many thanks Les Regretfully no data sheet provided whatsoever. Thanks again.
rene'

Just look at the datasheet for the chip, these sort of products basically follow the examples from the datasheets, and the maximum input voltage for the chip will be specified there. As Les has already said, the input capacitor is 50V, and the maximum input to the chip on the datasheet is 45V.

 

[ChrisP58]

Here is Texas Instruments (The original manufacturer of the chip) datasheet for the part.

https://www.ti.com/lit/ds/symlink/lm2596.pdf

 

[Les Jones]

As the pictures provided are so poor then rene' will have to read the part number himself and find the data sheet if it is not a LM2596 (The item on the board in the Ebay link)

 

[Nigel Goodwin]

It's an LM2596, it's a VERY standard Chinese board, I have some at home. You can even find the schematic on google, although it takes a little bit of sorting through until you find the correct one.

 

[ClydeCrashKop]

I have one of those.
Adjustable 1.5-37V DC/DC Buck Converter with LED Volt Meter
Item #: 30149 PS
https://www.mpja.com/Adjustable-15-37V-DC_DC-Buck-Converter-with-LED-Volt-Meter/productinfo/30149+PS
Non Isolated, adjustable DC/DC Buck(Step Down) Converter, switching Regulator with built-in 3digit LED Voltmeter. Pressing Onboard switch cycles through display of: Input, Output & press & hold for Display Off.
Regulator
Input: 4.5-40VDC
Input voltage must be 1.5V higher than the output voltage
Output: 1.5-37VDC
Rated Current: 2A
Regulation: 0.5%
Meter
Resolution: +-0.1V
Range: 4-40V
4VMin Input Volts to Board for Meter Operation
Requires heatsink for output exceeding 10Watts
L: 2-5/8" W: 1-3/8" H: 1/2” WT: .06