r/PrintedCircuitBoard • u/sharavanapriyan07 • 1d ago

PCB feedback

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Hi guys, I'm a beginner in pcb. Kindly review this and suggest changes. This is a DC to AC Inverter circuit

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5

u/M44PolishMosin 1d ago

Which AI did you use to slop this "schematic" together

4

u/negativ32 1d ago

This is a schematic, not a PCB.
It is so simple, just draw it with all the connecting wires.
Everyone seems to post schematics with labels not realizing they do not read as well as connected ones.

3

u/SteveisNoob 1d ago

You seem to have no idea how to make an inverter, I suggest that you do some research on inverters and synchronous buck converters.

This should get you started.

2

u/Enlightenment777 1d ago

This comment is posted on all reviews.

Please make sure your review post adheres to:

  • subreddit rules (#1 to #6), review rules (#7), review image rules (#8), see link.

Please fix these common schematic layout issues: (if yours has any of these issues)

  • Don't allow text / lines / symbols to touch each other, and don't draw lines through symbols.

  • Use correct reference designators (RefDes), and renumber to remove numeric gaps, see tips.

  • For positive voltage circuits, point positive power rail links upwards and grounds downwards (maybe sideways), see tips. For negative voltage circuits, point negative power rail links downwards and grounds upwards (maybe sideways). For bipolar circuits, maybe point grounds sideways.

  • Place decoupling capacitors vertically below postive power rail lines with ground on bottom side of the capacitor. Place capacitor next to IC symbol, and connect a line to IC positive power rail pin, see tips and example.

  • Place pull-up resistors vertically above signal lines, and place pull-down resistors vertically below signal lines, see example and tips.

  • Reasonably minimize the use of unique net labels, because everyone hates hunting for them!! Single resistors / capacitors / diodes should not sit by themselves, instead move & connect them with a line to their circuit.

  • More schematic conventions / guidelines / tips - 1, 2, 3, 4.

Please fix these common PCB layout issues: (if yours has any of these issues)

  • Silkscreen - add board name / board revision number / date (YYYYMMDD, YYYYMM, YYYY) for traceability.

  • Silkscreen - add pin 1 indicator next to ICs & connectors (not under parts). For polarized capacitors, add "+" next to positive pin. If part is through-hole package, place indicator on both PCB sides. See 1, 2, 3, 4.

  • More PCB conventions / guidelines / tips - 1, 2, 3, 4, 5.

3

u/captain_cavemanz 1d ago

That is not a PCB. It's a Schematic.

It one-day will be a PCB 🙏

3

u/Enlightenment777 1d ago edited 1d ago

Connect everything together with lines.

1

u/FELEXPCB 1d ago

Three things before you lay this out.

The 12V rail needs bulk capacitance and a fuse. A push-pull pulls current in pulses at the switching rate, and a bench supply or battery will sag - a few hundred uF right at the transformer centre tap, plus a fuse sized for the average current.

The FETs: IRF540N is rated 100V, and with 12V plus transformer leakage inductance the drain spike at turn-off can get close to that. Put an RC snubber or a TVS across each drain-source, and keep the loop from the centre tap through the FETs short.

If the AC output is mains voltage, that's a different category of design - creepage and clearance on the PCB, a fuse on the output, and a transformer rated for the switching frequency. Don't breadboard that side.

One check on the schematic: a 555 has a single output. If OUT_INV comes from a separate inverter, fine - but if it's meant to be the same pin, both FETs switch together and the transformer primary looks like a short.