can someone plz compare my schematic to the original. need a 2nd pair of eyes... - Page 1
Forum section: electronics / projects

author: bigjoncoop
author_rank: Regular Contributor
timestamp: March 14, 2022, 07:24:59 am
content: hey fellaz,I'm about to order some pcb's of a project I've been working on. I found a project on GitHub and basically remade the schematic in easyeda so I could make some minor changes and layout my own pcb's .I've went over it a few times to make sure I didn't mess anything up while re-making the schematic before I place my pcb order and the more I look at it, the "blurrier" it gets... LOLIts just a simple circuit using a Attiny, TP4056 Charging IC, and a beeper... It a lost model alarm for RC stuff (fpv quad copter in my case)Here's Mine and the original:

author: bigjoncoop
author_rank: Regular Contributor
timestamp: March 15, 2022, 06:23:07 am
content: 141 views and no one wanted to help a brother out? LOL

author: Pulsepowerguy
author_rank: Regular Contributor
timestamp: March 16, 2022, 01:49:42 am
content: It looks right to me, but I am pretty certain the battery symbol is backwards.

author: Benta
author_rank: Super Contributor
timestamp: March 16, 2022, 08:29:21 pm
content: Quote from: Pulsepowerguy on March 16, 2022, 01:49:42 am+1Original "schematic" is terrible, but your copy will not win the "Art of Schematic Layout" prize either.

author: bigjoncoop
author_rank: Regular Contributor
timestamp: March 17, 2022, 04:58:11 am
content: Quote from: Pulsepowerguy on March 16, 2022, 01:49:42 am@PulsepowerguyIt may be. ive tripled checked that the CR2032 battery holder has the correct polarity on the pcb.I appreciate you taking a look for me.Quote from: Benta on March 16, 2022, 08:29:21 pm@Benta yes I agree. LOL I normally wouldn't make my schematic look that way but since I was trying to copy the existing one I had to position / orientate everything the same because I kept loosing track/getting confused otherwise.I've watched EEVblog Dave's video on proper schematic etiquette... LOLThanks again for taking a look. I do appreciate it.If your interested, heres the pcb

author: Swake
author_rank: Frequent Contributor
timestamp: March 17, 2022, 11:06:01 pm
content: On the second PCB image, that big copper pad under the battery cell comes in contact with the trace on its right.Actually taking a second look at the PCB's it seems there are quite some places where clearance between a solderpad and an unrelated track is too small and looks more like a short. For example U4 (1µF) on the right of first PCB image looks shorted.Having the red led on the opposite face of the other 2 doesn't look practical.

author: Benta
author_rank: Super Contributor
timestamp: March 17, 2022, 11:23:45 pm
content: Yeah, needs really expensive etching at the PCB manufacturer.And the "Manga" style font doesn't improve readability either. Makes you think forbidden substances are in play...

author: Pulsepowerguy
author_rank: Regular Contributor
timestamp: March 18, 2022, 01:05:20 am
content: I can only say there a lots of clearance issues. Don't know where to start.

author: tooki
author_rank: Super Contributor
timestamp: March 19, 2022, 10:30:39 am
content: Quote from: bigjoncoop on March 14, 2022, 07:24:59 amOne tip I highly recommend: while copying, use the same component designators as the original. It’s much harder to make sure you didn’t miss anything if on top of the circuit itself, you have to keep track of “R4 in the original is R7 in my copy” and so on.Quote from: bigjoncoop on March 17, 2022, 04:58:11 amAs others have said, double check your clearances. I’ve been burned by EasyEDA’s weak clearance detection before. Before you send it off for manufacturing, be SURE to re-generate your copper pours!!

author: CMTan
author_rank: Contributor
timestamp: March 20, 2022, 05:28:45 pm
content: There seems to be several issues with the schematics1. I think Point A and B should be connected2. Point C, as someone pointed out earlier is reversed3. Point D, should be connected to the base of the transistor with a series resistor4. Point E is connected to the buzzer and LED. Does it have enough current to drive the buzzer. Normally buzzer needs a stronger drive so should have a driver stage (with a transistor)