Baofeng Baofeng AR 152 Teardown (I'm studying for tech&gen)

[aplchndragon]

Because of this thread I decided to gather some information.

Here's what I have so far:


There is a tamper switch.


the opposite side local circuitry below



Note: the display was removed. the slit at the bottom of the image is one of four places the metal shield tabs were bent to hold and there is a ground at each of the four slits.

cast aluminum frame





to be continued.

Sorry, I lost connection there. Here's more.


Something to note: When I unbent the tabs from the metal screen frame and pulled the unit away, there were some markings on the screen that seemed to have a view characters I can't recall what letters. but there were a couple vertical lines as well. based on the design I assume that is from removing the screen element I somehow either static discharged or there was some residual charge or an induced charge when I pulled the metal shield away from the display.

this was below the backlight diffusion panel

 

[aplchndragon]

I made an effort to verify that the numbers on the chips could be easier to search.

this was below the backlight diffusion panel
View attachment 179255
I assume this is for protection of sensitive stuff. I will investigate the substance and removal methods soon.

View attachment 179254View attachment 179253
YL260 •Ak1E (the smaller unit)
A T 1846S AP34U333 (the black chip)

View attachment 179252

KDHM8F3K8 2249031

View attachment 179251
HTL7G06S011P EREE0099 2323-JY

View attachment 179250
3PEAK LM2904B BANP

View attachment 179249

EC 14L 16000

View attachment 179248
5807M TL153

View attachment 179247
LT-ZY 2306

 

[AK9R]

The chip under the blob is probably a semi-proprietary microcontroller that runs the radio.

Looks like HTL7G06S011P is an LDMOS power amplifier good for 11 watts up to 600 MHz:

https://www.watechelectronics.com/Public/Uploads/uploadfile2/files/20241107/HTL7G06S011PProductdatasheetrev1.8.pdf

LM2904B is an op-amp. They might be using it as an audio amp:
https://www.3peak.com/high-voltage-op-amps/lm2904a

 

[aplchndragon]

The chip under the blob is probably a semi-proprietary microcontroller that runs the radio

I thought about that too. I'll know more hopefully this weekend. spectroscopy sensor (other project) comes in soon.

Looks like HTL7G06S011P is an LDMOS power amplifier good for 11 watts up to 600 MHz:

Feature #10505: uv-5r setting tab not working in chirp - CHIRP I found this chip was also used in a bf uv-5r
This image is of the uv-5r

20230414_073842598_iOS.jpg - CHIRP

Redmine

chirpmyradio.com

20230414_073201107_iOS.jpg - CHIRP

Redmine

chirpmyradio.com

I haven't done a closer inspection of the circuits for the uv-5r yet

LM2904B is an op-amp. They might be using it as an audio amp

LM2904B

LM2904B data sheet, product information and support | TI.com

TI’s LM2904B is a Dual, 36-V, 1.2-MHz operational amplifier with -40°C to 125°C operation. Find parameters, ordering and quality information

www.ti.com

EC 14

EC14 PDF

Part #: EC14. Description: OSCILLATOR. File Size: 141.77 Kbytes. Manufacturer: Ecliptek Corporation.

www.alldatasheet.com

A T 1846S

RDA1846S Datasheet(PDF)

Part #: RDA1846S. Download. File Size: 1MbKbytes. Page: 16 Pages. Description: Single Chip Transceiver For Wlkie Talkie. Manufacturer: List of Unclassifed Manufacturers.

www.alldatasheet.com

YL260

Shenzhen Jasencan Electronics Co., Ltd.

www.jasencan.com

5807M TL153
can't find anything yet

 

[aplchndragon]

 

[aplchndragon]

BaoFeng 152 teardown. Need help analyzing.

Link to my radio reference.com post with more pictures and chip numbers, etc. Briefly, there is a tamper switch that triggers when the case is opened. this switch is connected to some separate circuitry behind the keyboard. The keypad looks like it sends button presses via RF instead of wired in ...

linustechtips.com

I'm working on ways to get answers without knowing how to ask the right question.

Apparently newsie sentences and putting "foil" in the title wasn't enough to imply satire:

Teardown of Baofeng AR 512. YouTubers and early adopters confused, faceless fixes intrigue. I ran out of foil.

https://linustechtips.com/topic/1604534-baofeng-152-teardown-need-help-analyzing/ http://forums.radioreference.com/threads/baofeng-ar-152-teardown-im-studying-for-tech-gen.485669/ I'm wondering why it looks like the keypad seems to use rf to transmit the keypresses. I'm not familiar enough...

forum.allaboutcircuits.com

TC33X-2-203E Trimmer Potentiometer:
Data sheet pdf attached as well as at the source from the link below:

https://www.digikey.com/en/products/detail/bourns-inc/TC33X-2-203E/2566887

A potentiometer is a dynamic resistor that I've found can be used to correct bias or other calibration needs. what I dont know is why there is a corresponding nub on the case itself like its a plastic molding support but it aligns with the trim pot. Are they temperamental to vibration? this seems less like a plastic support and more like a friction nub to keep it from spinning while in use.

 

[aplchndragon]

I'm just learning about the PCB designs from other forums. I'm piecing it all together. If it seems crazy to do all of this. I'm just outputting and hoping for interaction. I write the way I do because I don't speak the way I write. I'm an autistic hillbilly. So, If you made it this far in the thread, welcome to me journaling my investigation and documenting questions. I loved instructing in the service. My favorite way to develop presentation and testing materials is to ask all the questions and embrace the dumb. Take turns to ask questions as if you deliberately miss the point trying to agitate the knowledge out of someone quickly. Like Godwin's Law.

I'm interested in, as this project has shown me, the electrical engineering and now I think next I'm going to look for the cutting edge tech/theories/papers to skim for anything novel and look for the problem it was solving. the PCB has buried lanes, vias (I just learned these things).

Are there any unique and niche circuitry form factors specifically made by, for, because of radio operators and radios that ended up in other industries?

Nasa has a thing where their work has led to things we use in medicine, for example. The fuel pump for the shuttle, that technology was developed by NASA and it led to, among other things, pediatric artificial heart technology.

My posts will look dumb and spastic because that's just how I can be without having a starting point or a guide (or topic) for the conversation, etc. So far I'm learning little by little with no real specific learning objective. I like learning as many seemingly disconnected tidbits and facts that I can spend time thinking about because it's fun to try to find the connections in my head, even if it's googleable or otherwise commonly known. Additionally, I'd argue that we are so hell bent on being accurate out of the gate, that we fail to embrace the intellectual productive potential of allowing moderate errors and, instead, focusing on improving error detection and correction. Learning isnt finding information. It's finding your own dumb and correcting it, but people fear witnesses to this solipsistic nudity. I don't. I give negative ****s for looking dumb and being brutish. This effort to learn, and my rationale now better articulated, is a vocational rehabilitation and hobby interest.