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From: zen cycle <funkmasterxx@hotmail.com>
Newsgroups: rec.bicycles.tech
Subject: Re: For those who believe in electricity
Date: Wed, 9 Apr 2025 07:07:19 -0400
Organization: A noiseless patient Spider
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On 4/8/2025 6:20 PM, Jeff Liebermann wrote:
> On Tue, 8 Apr 2025 16:00:01 -0400, Zen Cycle <funkmaster@hotmail.com>
> wrote:
> 
>> On 4/8/2025 3:04 PM, Frank Krygowski wrote:
>>> On 4/8/2025 1:40 PM, Zen Cycle wrote:
>>>> On 4/8/2025 12:44 PM, Frank Krygowski wrote:
>>>>> On 4/7/2025 2:58 PM, Zen Cycle wrote:
>>>>
>>>>>> Just as a matter of personal interest, can you read the numbers off
>>>>>> the 16 pin IC?
>>>>> It has no numbers or other codes at all! It's solid black with a sort
>>>>> of fine stippled finish.
>>>>>
>>>>
>>>> Take another look. I can see 4 rows of text but the resolution on the
>>>> picture isn't good enough to make it out. FWIW, it's the square device
>>>> in your second picture with 4 solder joints on each side, next to the
>>>> octagonal device with "220" written on it (that's a 220uH inductor,
>>>> likely part of a PWM or PS switcher circuit).
>>>
>>> Sorry, Zen, it absolutely has no writing on it. I don't know if I can
>>> manage a micro photograph to convince you, but I'm using a high powered
>>> loupe in sunlight. It's just a stippled black finish.
>>>
>>>
>>
>> Try again, using this as a reference:
>>
>> https://1drv.ms/i/c/5c034a6b86a172e9/EX6snfFdTeJMl1tfB4xqOUwBXw_4YXVPsbTNjw04Bpgcdw?e=lFRSWg
>>
>> 4 lines of text. I think I can make out 4x35x on the first line, but
>> that's it.
> 
> I tried feeding the original photo to an online AI photo enhancer:
> <https://yce.perfectcorp.com/photo-enhance>
> The photo is too far out of focus to produce more than a few
> characters.

I can still see some blurred text in the first of the newer photos, but 
no real improvement. The other newer photo and the larger version of 
that he sent subsequently is a bad angle, looks more like the "solid 
black with a sort of fine stippled finish." he's describing

> 
> Frank.  If you photograph something at an angle as in the photo of the
> PCB, the depth of field will limit the surface area that will be in
> focus.  I suggest you take the photo again and position the camera
> more perpendicular to the PCB. 

The light will need to be angled to enhance the etching on the part. An 
omnidirectional light source can obscure the etching (I know this from 
personal experience).

  Don't position the camera perfectly
> perpendicular or you might see a reflection.  If your camera has an
> autofocus area mode feature, that allows you focus on a specific area
> of interest, it will autofocus on this area of interest and blur
> everything outside this area.  The area of interest is usually the
> center of the screen, but on some cameras, can be resized and moved
> anywhere on the image.
> 
> Also, brighter light will improve the depth of field.  (Smaller
> apertures have a greater depth of field).  However, don't use a point
> source of light or your photos will have shadows.
> 
> "What are Autofocus Area Modes? | Camera Focusing Basics Pt.3"
> <https://www.youtube.com/watch?v=nlzlKZWUI38>
>