Hi Friends,
I am planning to design a high speed switch circuit, My first question is
1) Is there any way to reverse engineering this https://www.amazon.com/NOYITO-4-Channel-Electronic-Controlled-Completely/dp/B07PS2C4YP amazon board? I just need the circuit diagram and can start from there. Your help is much appreciated! Thank you and have a great weekend!

 

Hi Friends,
My first question is
1) Is there any way to reverse engineering this https://www.amazon.com/NOYITO-4-Channel-Electronic-Controlled-Completely/dp/B07PS2C4YP amazon board?

My first answer is Yes.
IT looks like it may be easy to reverse-engineer, just takes a littler patience. and a strong bench light.
What is the purpose of reverse engineering it in the first place?

 

It's just an opto-isolated MOSFET switch. It's a pretty simple standard arrangement.

You can see the MOSFET part number in one of the pictures and they show the circuit board in another. There's not a whole lot to "reverse engineer" – opto-isolators pretty much have the same package layout, and the LED resistor can be calculated based on your control voltage.

Look up MOSFET switch circuits to see the basic arrangement.



From the Amazon page:

 

Also, you require a suitable CAD pgm in order to draw the scematic, if needed, there is free Kicad.

 

1) Is there any way to reverse engineering this

Yes. The complete PC board layout drawing is on the product page. Copy it.

Here is the FET: https://www.datasheet.live/pdfviewe...et.live/5693b47c/infineon.com/IRF5305SPBF.pdf

Note that you cannot reproduce this board for less than it costs to buy.

ak

 

 

I am planning to design a high speed switch circuit.

Where on THIS does it describe it as being "High Speed Switching"?

Note that you cannot reproduce this board for less than it costs to buy.

Agreeing with that statement.

 

My version - channel 1


This is also a very bad design:
1. Input resistor R1 to opto-coupler - for 3v operation needs to be around 270ohm., but opto-coupler will fry on >15v input (If exceeds max of 50mA)
2. Inputs > 12v will potentially overheat R1 (0.4W v 0.1W part)
3. Supply voltage > 20v will potentially destroy MOSFET as will exceed Vgs(max) for MOSFET when opto-coupler turns on.

 

my version, wide input range, LED current more or less constant and under 3mA, low heat dissipation (transistor handles it)