technerdchris/boards

These are boards I reverse engineer for my own understading.

boards

These are boards I reverse engineer for my own understading. Not sure if sharing this info via github repos is t he way to go, but let's give it a try.

Whenever possible, attribution to the board's creator will be given. Many of these tiny boards I buy are some kind cheap clone or nameless knockoff. These will be "by unknown". If anyone knows the origin of a baord covered here, please create an issue with the attribution or anecdotes.

boards's Issues

Voltage or current control?

Does this part vary current or voltage as a control mechanism via a PWM input signal? I'm trying to find a device that will output a fixed voltage (same as input) with a variable current output.

What is the logic of this board

Thanks for posting your link on https://www.amazon.com/gp/product/B07XJSRY6B/
I'm not super familiar with MOSFETs so these questions may be misguided.
My impression was that by connecting the following...
1 - a 12vdc source to the Vin
2 - an ESP32 PWM (8bit running at 5000)
3 - a multimeter to the Vout
... would demonstrate an ability to control the voltage of Vout. (also see attached diagram)

No doubt it's my lack of knowledge of MOSFETs, but I was expecting that by running the PWM duty cycle from 1 to 255 I'd see almost 0vdc - 12vdc on the Vout. Instead there's no change whatsoever. Setting the duty cycle to 0 does, in fact, turn the Vout off, but beyond that there's no control.

What am I not understanding?

CORRECTION -- I diagrammed the PWM / GND in reveres of how I wired.

Board Question

Hello, thank you very much for this schematic!

Hope you don't mind if I post a question here.
On the D4184 board do you think this situation would cause a short:

1. Directly connecting Vout+ and Vout- by connecting a wire to both (at the screw terminal)
2. Connecting power to Vin+ and connecting Vin- to a Load, which is grounded to the chassis.

When the MOSFET is turned on, would this cause a short between the VOUT- (Drain) to VIN- (Source) and 5V GND. I suspect the buck converter does not provide isolation between the 5v gnd and 12v gnd.

It's this converter here: https://www.amazon.com/Regulator-DROK-Automotive-Waterproof-Transformer/dp/B081RMFSCG

I would certainly appreciate your or anyone else's input on this. Thanks!

I posted 2 diagrams.
The first is the D4184 Connections
The second is the whole circuit, the D4184 sits on the right side.