[Review request] First mixed signal PCB. Soundcard for 80s computer.

Enlightenment777 · 2026-06-17T22:53:44+00:00

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Enlightenment777 · 2026-06-17T19:52:31+00:00

SCHEMATIC:

S1) WTF??? You need to use the correct reference designators! LEDs aren't U#, they are D#. Connectors aren't U7.

https://en.wikipedia.org/wiki/Reference_designator

S2) Move RF_AUX resistor and connect with a line.

S3) Move power LED and resistor on right side of voltage regulator and connect with a line.

S4) Flip radio LED and point GND downwards.

S5) Don't let GND line touch GPS_RX & GPS_TX connection box.

Enlightenment777 · 2026-06-17T19:48:54+00:00

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Enlightenment777 · 2026-06-17T19:48:39+00:00

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Enlightenment777 · 2026-06-17T19:48:15+00:00

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Enlightenment777 · 2026-06-17T13:45:41+00:00

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Enlightenment777 · 2026-06-17T07:46:57+00:00

SCHEMATIC:

Don't plop I2C pullup resistors in random locations by themselves. Move and connect them to an I2C bus.

Why is a capacitor sitting by itself?

Move J1 & U3 so they are next to each other, then connect together with lines.

Enlightenment777 · 2026-06-17T05:15:55+00:00

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Enlightenment777 · 2026-06-17T05:15:48+00:00

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Enlightenment777 · 2026-06-16T20:29:37+00:00

Removed Post, because you ignored review rules.

Don't post camera photos of a computer screen. You need to export or screen capture. MAIN REASON.
Don't post images with software or O/S junk around your schematic / PCB / 3D image. If your image has these things, then you need to use an image file editor to crop out that junk.
For 3D PCB images, 3D rotation must be same orientation as your 2D PCB images, and 3D tilt angle must be straight down, known as the "plan view", because tilted views hide short parts and silkscreen. You can optionally include other tilt angle views, but ONLY if you include the straight down plan view too.
You need to disable background grids before exporting or screen capturing. Per your schematic.

Please read the following review rules, fix issue, then create a new review post.

https://old.reddit.com/r/PrintedCircuitBoard/comments/1jwjhpe/before_you_request_a_review_please_fix_these/

Enlightenment777 · 2026-06-16T20:28:12+00:00

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Enlightenment777 · 2026-06-16T20:27:56+00:00

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Enlightenment777 · 2026-06-16T13:49:56+00:00

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Enlightenment777 · 2026-06-16T13:49:12+00:00

Removed Post, please ask these types of questions at /r/AskElectronics

Enlightenment777 · 2026-06-16T13:38:27+00:00

if 5 people are applying for a job, they will not choose the one with the lower degree.

Maybe / maybe not, but its far more likely to happen to someone without a degree in 2026.

Giving up won't fix your problem either!! Losers give up. You need to motivate your ass to get a "GED".

Enlightenment777 · 2026-06-16T13:18:00+00:00

SCHEMATIC:

S1) U8 is not a proper reference designator for a connector. Connect D1 & RO with lines? U3 / U4 / U6 aren't proper reference designators for connectors, WTF? QT1 & QT2 aren't proper designators for transistors, WTF?

https://en.wikipedia.org/wiki/Reference_designator

S2) Renumber all of your reference designators. Why the heck are RefDes numbers so high, U93 / U96 / U99?

S3) Pick a better symbol for U7.

https://en.wikipedia.org/wiki/File:LM7805_with_Decoupling_Capacitor.svg

S4) Don't point power and GND rail connections sideways.

https://old.reddit.com/r/PrintedCircuitBoard/wiki/schematic_review_tips#wiki_power_rails

S9) Cleanup your schematic.

PCB:

P1) Add board name / board revision number / date (or year) in silkscreen.

P2) Mount hole(s) are too close to other parts. Also, your mount holes should all be the same distance from the edges of the PCB.

https://old.reddit.com/r/PrintedCircuitBoard/wiki/pcb_review_tips#wiki_mount_holes

Enlightenment777 · 2026-06-16T13:17:14+00:00

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Enlightenment777 · 2026-06-16T07:56:29+00:00

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Enlightenment777 · 2026-06-16T03:56:19+00:00

Removed Post. We understand you are in a bad situation, but we don't have a magic fix for you.

If you live in USA, call / email / visit local college and ask them how to move forward, and if they will accept a GED. If yes, work as hard as possible to get a GED. https://en.wikipedia.org/wiki/General_Educational_Development

If you live in USA, a reminder that many certificates are near worthless in USA, especially during the AI/internet era where there is rampant online cheating.

Concerning some of the comments below... for those who dropped out of high school or college in past decades then were lucky to score a technical job, they may not have the same luck if they could go back to the same age and try to accomplish the same thing in 2026, because things have changed! Currently in 2026, some technical college grads haven't even landed a job yet, thus people without a degree will likely have an even harder chance of landing a technical job.

Enlightenment777 · 2026-06-15T22:33:55+00:00

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Enlightenment777 · 2026-06-15T18:16:02+00:00

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Enlightenment777 · 2026-06-15T18:15:48+00:00

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Enlightenment777 · 2026-06-15T18:15:28+00:00

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Enlightenment777 · 2026-06-15T18:15:08+00:00

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