Understanding motor driver server

Hi, I am very new to this, so please bear with me... I'm trying to come up with a DC motor circuit driver for a project using a commonly available 220v DC motor which currently has an over complicated circuit board. Basically, I've got the guts out of a vibrating plate (Fat shaker plate). The existing circuitry whilst working very well and the motor runs well on it, has to be set up for operation, meaning there are touch sensitive buttons to tell it how long to run for and how fast to run. I want to make something way less complicated so it is just a matter of: Turn the power on, press a button, motor runs at a pre set speed for a pre set time then turns off. I have started by buying a cheap eBay motor driver, which would run the motor for as long as it's turned on, fair enough, but going off the noise coming from the motor, I'm guessing the power it is supplying to it isn't ideal, so I wanted to work out how the two circuits differ and which bits of the old complicated circuit, I need to employ in order to create a new circuit that serves my purpose. With me so far? I have done my best to reverse engineer the cheap eBay motor driver circuit to see how it works and see how circuitlab graphs its output, but for one, the circuit that it appears to be doesn't make any sense to me and circuitlab certainly doesn't seem to like it either. Here's a link: to the circuit I created, from looking at the board and the components soldered onto it as best I can. There are three components that I'm not entirely sure of, Two, what I think are capacitors, but don't understand their use, one yellow, one red, then there's a rather important elusive little blue guy which I have no idea what it is, save I get a resistance across it using a test meter, so assume it's some kind of resistor. There's a Triac (or at least I think it's a Triac) on there and I've never used one before so not sure how it should be displayed on the schematic. Now, as you see on my circuit, the bit that appears to make least sense to me is that the + & - terminals of the small Bridge Rectifier both appear to be connected via 32.5Kohm resistors to the same source, surely that shouldn't work? I have attached photos of the specific components I'm not certain of and also a few photos of the actual board, see if you can see something I'm missing? Like I said, I'm very new to electronics, so eager to learn whatever You can teach me along the way. Kind regards.

by WoodpeckerCol
March 29, 2023

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