Hi,
A full diagram would have been more helpful to understand the circuit, with your provided circuit its hard to tell. You need to specify at the very least the other pins 16 and 3 of the TL494.
However from the point of connection alone - trimpot touching the 0.1 ohm sense resistors - it looks like current limit control where the trimpot is controlling the current and the MCU setting the high side with GPIO - much like an enable signal.
Again without further details I can't tell for sure.
Good luck with your studies
If you compare your board with the one on Ebay that one looks like the better board.
You may gain some insight by comparing the P6? on your board with the three in the schematic and see if it connects the same as one of them. This is the schematic of the Viber12a in a battery charger.
Thank you everyone for your help and advice. I found a brand new updated AMP plate (DSW Pro 550) for $150.00. I think I might just keep this one (DSW Pro 500) for parts.
Thanks again!
An H-Bridge (Full-Bridge) driver is quite popular in driving loads such as brushed DC motors and it is widely used in robotics and industry. The main advantages of using an H-Bridge driver are: high efficiency, rotation direction change, and braking the motor. In this article/video, I have introduced a complete H-Bridge DC motor driver using four IR3205 power MOSFETs and two IR2104 MOSFET drivers. Theoretically, the above-mentioned MOSFET can handle currents up to 80A, however, in practice we can expect to get currents up to 40A if the MOSFET temperature is kept as low as possible, using a big heatsink or even a fan.
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