Author Topic: My first PCB [schematic]  (Read 1447 times)

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Offline lscw

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My first PCB [schematic]
« on: December 23, 2021, 11:12:46 pm »
A little while ago I bought a no-name soldering station from a Chinese Amazon distributor that arrived unfit for purpose and downright dangerous, so great opportunity to make my very first PCB. Having never created a thing before for which some proto-board would not suffice.

I have attached the schematic, I would really appreciate any feedback on the circuitry, or indeed schematic design, before I proceed to lay it out on PCB. It's my first "proper" schematic design I've attempted as well (i.e. one I would want to be proud of).

Most of the circuit is taken straight from the original board wherever it appears safe and sane although I've replaced the original no-name micro with a PIC18 and 7seg display driver to save on traces. Both the '12V power rail' and relay are my addition and repurposed the on/off switches to allow the transformer to be disconnected when not in use.
The original board had the primary hardwired to the mains input and the transformer gets a bit too hot if left connected. I wonder if there's anything more that can be done to prevent that?

Edit to add I missed some part names (7805, 1n4007 etc) but not sure what value most of the caps should be. I will try to remove and measure the 0805s, not sure if I'll effect their values much in the process.
« Last Edit: December 24, 2021, 06:34:19 pm by lscw »
It works in practice but does it work in theory?
 

Offline LazyJack

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Re: My first PCB [schematic]
« Reply #1 on: January 23, 2022, 09:57:23 pm »
D14, D15 in the 5V section should be the other way around.
 
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