Author Topic: JLC PCB Prototype Assembly - Incredibly Cheap  (Read 44835 times)

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Offline pmnxis

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #100 on: September 09, 2019, 12:19:54 am »
[attachimg=2]
placed order and paid finally.
There's chinese thanks giving day soon and some legit vacation day. So I guess my order will be delay.
I hope they accept professional business production too even there's higher engineering fee.

I will review my thing is come to me.
 

Offline SteveyG

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #101 on: September 09, 2019, 06:33:37 am »
Assuming there's no problems, you'll probably get it shipped out before the holiday.

Mine has just finished ENIG process, so shouldn't be long now...  :popcorn:

Offline langwadt

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #102 on: September 09, 2019, 03:49:23 pm »
Well, for now not enthusiastic about the component availability.
This is what i was able to populate.
 [attachimg=1]

Positioning issues are a huge time sucker.
For now i think i am sticking with PCBWAY for this kind of boards.

The risk of making errors not having a professional doing the positioning is a huge bummer for me. If I screw this two times, my customer is going to kick me where the sun doesn't shine.

Something odd ball going on with your 5 Pin SOT-23's     They all seem 180degrees out.

a good reason to use asymmetrical packages, then it is at least obvious when the rotation is wrong

 

Offline mrpackethead

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #103 on: September 09, 2019, 07:49:25 pm »
The biggest problem for me in this, is that unless they can supplky all the components, then a partial assmembly is just not going to be useful.   
On a quest to find increasingly complicated ways to blink things
 

Online bd139

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #104 on: September 09, 2019, 08:00:25 pm »
It’s fine for first phase production. Most designs can be optimised into their BOM availability. Then you can ship your crap off to another factory for final hand placement or do it yourself. I think I can get my in dev product down to three hand placed parts if I rework some stuff. That’s pretty good and saves me time and money.

Optimisation is key. Compromises need to be made to favour automation and reduced cost.
 

Offline spongle

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #105 on: September 09, 2019, 08:23:26 pm »
but at that point is it really cheaper than elecrow, pcbway or some other full service PCBA?
 

Offline tom66

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #106 on: September 09, 2019, 08:30:02 pm »
Depends on whether it is a hobby project or not.
A lot of hobby projects I'm much more willing to put time in versus money, even if my "time" is worth more.
Commercial projects where engineers cost £30+ an hour then it's harder to argue when you are saving only £100 or so...
 

Offline Mr. Scram

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #107 on: September 09, 2019, 10:35:34 pm »
Depends on whether it is a hobby project or not.
A lot of hobby projects I'm much more willing to put time in versus money, even if my "time" is worth more.
Commercial projects where engineers cost £30+ an hour then it's harder to argue when you are saving only £100 or so...
Engineers for 30 quid an hour?
 

Offline mrpackethead

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #108 on: September 10, 2019, 12:37:12 am »
44-47k Stiring..  is about 22.5 / hour.
On a quest to find increasingly complicated ways to blink things
 

Offline yombo

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #109 on: September 10, 2019, 01:52:11 am »
It is here, I can place assembly orders already!  ;D  :-+

Edit: Where is supposed to be the origin of component coordinates? I can't see my components in the preview.
« Last Edit: September 10, 2019, 02:07:00 am by yombo »
 

Offline ddavidebor

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #110 on: September 10, 2019, 05:46:32 am »
but at that point is it really cheaper than elecrow, pcbway or some other full service PCBA?

I've posted one example a few post back where it wasn't worth it. It's going to depend primarily on these factors:
* how many of your components they can assemble
    * how many are SMT?
    * how many are in their list?
    * how many are of type "basic" in their list?
* How many they can't?
    * can you get them easily and cheaply? Many suppliers, time spent ordering, shipping cost, duties...
    * are they easy to solder?
* What degree of trustworthiness, experience and reliability do you need?
    * inspection is going to be minimal to keep price down
    * process is heavily automated, so you don't get an expert technician reviewing it
    * how much do you trust yourself getting the positioning right?
* How much is your time worth and what purchasing power does your national currency have against the dollar?



a good reason to use asymmetrical packages, then it is at least obvious when the rotation is wrong

Yep. Love my sot-23-5

Davide Bortolami,
Fermium LTD
 

Offline SteveyG

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #111 on: September 10, 2019, 05:59:33 am »
    * inspection is going to be minimal to keep price down
    * process is heavily automated, so you don't get an expert technician reviewing it
    * how much do you trust yourself getting the positioning right?

The process is better controlled than you're suggesting. They're basically able to offer these boards for this price because your PCBs are being pooled onto the commercial PCB production line otherwise it wouldn't be commercially viable. The manufacture files are reviewed and fixed by their technicians, rotation fixed, placement fixed etc (up to a point...)

Offline ddavidebor

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #112 on: September 10, 2019, 06:17:25 am »
    * inspection is going to be minimal to keep price down
    * process is heavily automated, so you don't get an expert technician reviewing it
    * how much do you trust yourself getting the positioning right?

The process is better controlled than you're suggesting. They're basically able to offer these boards for this price because your PCBs are being pooled onto the commercial PCB production line otherwise it wouldn't be commercially viable. The manufacture files are reviewed and fixed by their technicians, rotation fixed, placement fixed etc (up to a point...)

I was referring to the assembly not the PCBs
Davide Bortolami,
Fermium LTD
 

Offline Mr. Scram

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #113 on: September 10, 2019, 06:39:31 am »
44-47k Stiring..  is about 22.5 / hour.
I assume that's what they get paid and not what they cost?
 

Offline SteveyG

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #114 on: September 10, 2019, 06:56:57 am »
    * inspection is going to be minimal to keep price down
    * process is heavily automated, so you don't get an expert technician reviewing it
    * how much do you trust yourself getting the positioning right?

The process is better controlled than you're suggesting. They're basically able to offer these boards for this price because your PCBs are being pooled onto the commercial PCB production line otherwise it wouldn't be commercially viable. The manufacture files are reviewed and fixed by their technicians, rotation fixed, placement fixed etc (up to a point...)

I was referring to the assembly not the PCBs

So was I :)

Offline SMTech

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #115 on: September 10, 2019, 10:45:31 am »
Given JLC et al run  your PCB designs though an engineer & approval process, I see no reason why they wouldn't also be doing some basic checks on your pick and place data , made somewhat easier by the fact they are heavily encouraging you to use standard set of parts they already know. I wouldn't necessarily expect such a process to spot the more annoying centroid file quirks however, the main one being if you have incorrectly defined your component centers so they instead show Pin1 or some other arbitrary co-ordinate. (although even that isn't out of the question if they can overlay placement data onto gerber)

In a previous posting someone suggested the rotation data was based on its rotation in the tape. This might be true in some cases for certain machines (e.g a Versatronics RV) but in actual fact what you should normally be doing is basing your rotation number on established IPC standards which exist for a reason. An example of why that is can be fairly simply demonstrated with the example of an SO8 device in either tape or a tube - potentially exactly the same part packaged two different ways with different rotations as presented to the pick head. If the rotation definition for the part in the tape and the device in the board all refer back to the same standard you can switch between either packing format with ease. Also good luck finding that data in the datasheet, more likely to either not be there at all or in a separate datasheet detailing the specific package in question.
« Last Edit: September 10, 2019, 10:52:20 am by SMTech »
 

Offline SteveyG

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #116 on: September 10, 2019, 11:09:14 am »
I wouldn't necessarily expect such a process to spot the more annoying centroid file quirks however, the main one being if you have incorrectly defined your component centers so they instead show Pin1 or some other arbitrary co-ordinate. (although even that isn't out of the question if they can overlay placement data onto gerber)

They definitely go through and check manually. I had to re-issue my board to include polarity markings on the silkscreen for the LEDs. They also fixed a rotated IC.
 
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Offline SMTech

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #117 on: September 10, 2019, 11:48:12 am »
Well rotation is an easy issue to fix & indeed spot. Regardless of who you use, it is very important to mark up LEDs, LED manufacturers are super inconsistent with how they mark up their devices and the technician shouldn't need to wade back though the traces on your circuit to make an educated guess, but IME always put them in the tape the same way round as a standard diode, makes inspection afterwards a real pain however as you can't do it without a datasheet for each LED, even sticking with one manufacturer doesn't help.

Much like the Screaming circuits blogger I typically see default IC rotation out by 270 degrees, data from two clients also rotates 2pin passives which is very odd.
 

Offline pmnxis

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #118 on: September 17, 2019, 01:18:52 pm »
mine came
first image is took by mirrorless camera.
you guys can check quality.

I think not bad for SAMPLE.

I am still fixing my pcb now.

Since I am in korea, so I will start mass product with korean local company.

[attach=1]

[attach=2]

[attach=3]
 
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Online 48X24X48X

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #119 on: September 17, 2019, 06:55:14 pm »
mine came
first image is took by mirrorless camera.
you guys can check quality.

I think not bad for SAMPLE.

I am still fixing my pcb now.

Since I am in korea, so I will start mass product with korean local company.

[attach=1]

[attach=2]

[attach=3]
Is that a short on the RS232 converter IC?
 

Offline blueskull

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #120 on: September 17, 2019, 10:02:52 pm »
mine came
first image is took by mirrorless camera.
you guys can check quality.

I think not bad for SAMPLE.

I am still fixing my pcb now.

Since I am in korea, so I will start mass product with korean local company.

[attach=1]

[attach=2]

[attach=3]
Is that a short on the RS232 converter IC?

Looks like lint to me.
 

Offline thm_w

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #121 on: September 17, 2019, 11:48:20 pm »
mine came
first image is took by mirrorless camera.
you guys can check quality.

I think not bad for SAMPLE.

I am still fixing my pcb now.

Since I am in korea, so I will start mass product with korean local company.

thanks, looks very good, whats with the optos though? Are you using them for low voltage isolation and not high voltage?
 

Offline pmnxis

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #122 on: September 17, 2019, 11:58:04 pm »
I didnt checked yet. I will do this weekend
 

Offline pmnxis

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #123 on: September 18, 2019, 12:00:24 am »
mine came
first image is took by mirrorless camera.
you guys can check quality.

I think not bad for SAMPLE.

I am still fixing my pcb now.

Since I am in korea, so I will start mass product with korean local company.

thanks, looks very good, whats with the optos though? Are you using them for low voltage isolation and not high voltage?

I am using for take a 5 or 12volt singnal or even high
I wanna uses 12v input with esp32. So I used Optocoupler.
I tried to use mosftet and tvs diode for this. But my application’s input voltage can be change somtimes (this mean cannot use resistor voltage dividing, maybe).
Well if there’s better solution i want to adapt it. But for now this is my best
« Last Edit: September 18, 2019, 12:05:49 am by pmnxis »
 
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Offline GeorgeOfTheJungle

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Re: JLC PCB Prototype Assembly - Incredibly Cheap
« Reply #124 on: September 18, 2019, 06:16:17 pm »
Esp32!  :-+  :clap:
The further a society drifts from truth, the more it will hate those who speak it.
 


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