Date   

Re: Replacing SMD component

R. Tyson
 

Hi Bill,
Thanks for the comment. I had seen a video where the tip is sliced with a hacksaw blade and then the ends bent to suit. However, I was feeling lazy and decided to just go with wrapping the wire and forming the two prongs from that.

I think I also had at the back of my mind that I could remove the wire and replace it with another winding with longer prongs if I needed to try and get an I.C. off at some time on a future project.

I have steered clear of working with SMD devices until now (fear) but realise that as they are now in common use I am going to have to try working with them. It looks as if they could actually be easier to work with given some time and experience and maybe a hot air system. From videos I have watched it seems that plenty of flux is a requirement for success.

Reg           G4NFR


Re: Replacing SMD component

Chris Weiss <cweiss@...>
 

+1 on the rework station - otherwise, look into solder braid. It's highly-conductive copper weave (about shoelace size). You put it against the component and your iron against it and it wicks up the solder - I've found it _very_ effective for removing both SMD and through-hole components. It's also cheap and lasts forever. 

Be really careful when pulling on things, it's possible to pull the solder pad up off the board which can be a pain to work around.





On Tue, Sep 8, 2020 at 10:56 AM Dj Merrill via groups.io <groupsio=deej.net@groups.io> wrote:
A cheap rework station works wonders for removing SMD components.  I
picked up this one last year and it does the job adequately:

https://www.amazon.com/gp/product/B07G7BH4HY/

-Dj







--
-Chris


Re: Replacing SMD component

Dj Merrill
 

A cheap rework station works wonders for removing SMD components.  I picked up this one last year and it does the job adequately:

https://www.amazon.com/gp/product/B07G7BH4HY/

-Dj


Re: Replacing SMD component

Ashhar Farhan
 

Here is what I do. I am quite butterfingers at this, btw.
I use whatever soldering iron I have, and then (hear this, the transistor is dead anyway), i load up liberal bits of solder on all the pads. solder helps in retaining the heat for the next step. next, i start to heat the pads, one by one, waiting until one is melted then move to the other. at the same time use a toothpick to gently keep pushing the transistor away. at some point, all the three will be simulatenously melted enough for the transistor to fly away. Many a times, it comes stuck to the iron itself (i use the iron to push it away - bad boy, i am). 
- f 

On Tue, Sep 8, 2020 at 10:29 PM JE Jesson <jejesson4@...> wrote:
In a pinch, a toothpick with a bit of clay helps position the surface mounted part into position and soldering one leg to anchor the part.  Solder the other leg and make sure both sides are glossy. 

Joe W2JEJ

On Tue, Sep 8, 2020 at 10:27 AM R. Tyson via groups.io <tysons2=btinternet.com@groups.io> wrote:
Hi,

Due to a senior moment ( I am old enough to be entitled to have them) I need to replace Q90 which is a dreaded SMD device. Ten SMD 2N3904 transistors arrived with the mail today. Wow, they are so small. I had previously found the location of Q90 on the board and verified it was no longer functioning and noted it's position, which is not too bad to get at. I am now waiting for a 1mm tip for my soldering iron and more importantly some liquid flux.

Meanwhile I had a look at YouTube and found some ideas for replacing SMD components without special tools. I opted for the following idea, photos below.

I cut down an old, knackered soldering bit and cleaned it up as shown in the photo. I then applied some heat conducting paste (probably not essential but I already had some). I then wound 1mm copper wire onto the remains of the soldering iron tip. The two prongs that are formed should enable me to heat all 3 connections on the transistor at the same time and it (should) come off the board easily. Well.... it looks easy when the guys do it on YouTube !

Reg                   G4NFR


Re: Replacing SMD component

JE Jesson
 

In a pinch, a toothpick with a bit of clay helps position the surface mounted part into position and soldering one leg to anchor the part.  Solder the other leg and make sure both sides are glossy. 

Joe W2JEJ

On Tue, Sep 8, 2020 at 10:27 AM R. Tyson via groups.io <tysons2=btinternet.com@groups.io> wrote:
Hi,

Due to a senior moment ( I am old enough to be entitled to have them) I need to replace Q90 which is a dreaded SMD device. Ten SMD 2N3904 transistors arrived with the mail today. Wow, they are so small. I had previously found the location of Q90 on the board and verified it was no longer functioning and noted it's position, which is not too bad to get at. I am now waiting for a 1mm tip for my soldering iron and more importantly some liquid flux.

Meanwhile I had a look at YouTube and found some ideas for replacing SMD components without special tools. I opted for the following idea, photos below.

I cut down an old, knackered soldering bit and cleaned it up as shown in the photo. I then applied some heat conducting paste (probably not essential but I already had some). I then wound 1mm copper wire onto the remains of the soldering iron tip. The two prongs that are formed should enable me to heat all 3 connections on the transistor at the same time and it (should) come off the board easily. Well.... it looks easy when the guys do it on YouTube !

Reg                   G4NFR


Re: Replacing SMD component

Bill Bates
 

I think I  would have simply used a junior hacksaw to cut a "fork" in the cut down soldering bit (Maybe have to bend the prongs out?), but it's scarier to contemplate than it is to do, I'm a senior to & I managed to change Q90 ok! God bless,  Bill, G6ATO

On 8 Sep 2020 15:27, "R. Tyson via groups.io" <tysons2@...> wrote:
Hi,

Due to a senior moment ( I am old enough to be entitled to have them) I need to replace Q90 which is a dreaded SMD device. Ten SMD 2N3904 transistors arrived with the mail today. Wow, they are so small. I had previously found the location of Q90 on the board and verified it was no longer functioning and noted it's position, which is not too bad to get at. I am now waiting for a 1mm tip for my soldering iron and more importantly some liquid flux.

Meanwhile I had a look at YouTube and found some ideas for replacing SMD components without special tools. I opted for the following idea, photos below.

I cut down an old, knackered soldering bit and cleaned it up as shown in the photo. I then applied some heat conducting paste (probably not essential but I already had some). I then wound 1mm copper wire onto the remains of the soldering iron tip. The two prongs that are formed should enable me to heat all 3 connections on the transistor at the same time and it (should) come off the board easily. Well.... it looks easy when the guys do it on YouTube !

Reg                   G4NFR


Re: Membership scam request

Jack, W8TEE
 

Pick one!

Jack, W8TEEEmoji

On Tuesday, September 8, 2020, 10:19:32 AM EDT, Bill Lamm <kd9mdl@...> wrote:


"I told you to keep that quiet..." 

The Nobel or the uBITX? 😉

--
Jack, W8TEE


Replacing SMD component

R. Tyson
 

Hi,

Due to a senior moment ( I am old enough to be entitled to have them) I need to replace Q90 which is a dreaded SMD device. Ten SMD 2N3904 transistors arrived with the mail today. Wow, they are so small. I had previously found the location of Q90 on the board and verified it was no longer functioning and noted it's position, which is not too bad to get at. I am now waiting for a 1mm tip for my soldering iron and more importantly some liquid flux.

Meanwhile I had a look at YouTube and found some ideas for replacing SMD components without special tools. I opted for the following idea, photos below.

I cut down an old, knackered soldering bit and cleaned it up as shown in the photo. I then applied some heat conducting paste (probably not essential but I already had some). I then wound 1mm copper wire onto the remains of the soldering iron tip. The two prongs that are formed should enable me to heat all 3 connections on the transistor at the same time and it (should) come off the board easily. Well.... it looks easy when the guys do it on YouTube !

Reg                   G4NFR


Re: Membership scam request

Bill Lamm
 

"I told you to keep that quiet..." 

The Nobel or the uBITX? 😉


Re: No ssb out in ubitx v3 #ubitx #v3 #power

_Dave_ AD0B
 

The Electret mic element s by far the most common item to fail. It is a very inexpensive part and worth having several on hand..Perhaps there is a spike when you plug them in or unplug them. 

The second most common is from someone modifying the circuit. including, changing the firmware
--
73
Dave
ADOB
Raduino bracket and Ham_Made_Keys


Re: Installing nextion 3.2P

Gerard
 

Nextion BUZZING
hello 
I tested with an FT114 inductance, the noise dininue a little, it is necessary to add a capacitor of at least 2200µf to attenuate on the 5V off the Nextion. I had a coil that I recuperate on the THT of a TV (Much smaller). REF L-LS 100C2 LSE. I measured it. 5.6 ohm and 12.3 mh. There associated with a capacitor of 2200µf, there is no more noise by changing the brightness. For information my connection is powered by a separate regulator. I will modify my PCB to implement correctly

cdt


uBitxV6 wiring guidance #ubitxv6

VU3WTJ
 

Dear Om,
I bought uBitxV6 last month and it was working absolutly fine. Now i want to upgrade it and attach Nexiton display, AGC kit, Audio amplifier kit, Digital mode kit etc. but I'm facing difficulty in wiring up. Need help for wiring. Display is Nextion BASIC NX8048T050 - 5.0" LCD TFT HMI Touch Display and 5" display cabinet from VU3SUA. The whole front and back panel wiring guideline is required. Photos attached  
73
VU3WTJ


Re: Membership scam request

Jack, W8TEE
 

Farhan:

I told you to keep that quiet...

Jack, W8TEE

On Monday, September 7, 2020, 2:16:50 PM EDT, Ashhar Farhan <farhanbox@...> wrote:


I know at least one particle physicist who owns a bitx. They say he even won a nobel.
- f

On Mon, Sep 7, 2020 at 11:14 PM Arv Evans <arvid.evans@...> wrote:
FYI...This is interesting.  

[BITX20] Message Approval Needed - melissa.franklin@... posted to BITX20@groups.io

This person(?) just posted a BITX20 membership request that included a long spam message.  Obviously a scammer, but it does represent a new way non-member scammers are trying to gain entry to our group.

The real Melisa Franklin is a respected Particle Physicist, so probably a false email ID.

Arv
_._


--
Jack, W8TEE


Re: Membership scam request

Ashhar Farhan
 

I know at least one particle physicist who owns a bitx. They say he even won a nobel.
- f

On Mon, Sep 7, 2020 at 11:14 PM Arv Evans <arvid.evans@...> wrote:
FYI...This is interesting.  

[BITX20] Message Approval Needed - melissa.franklin@... posted to BITX20@groups.io

This person(?) just posted a BITX20 membership request that included a long spam message.  Obviously a scammer, but it does represent a new way non-member scammers are trying to gain entry to our group.

The real Melisa Franklin is a respected Particle Physicist, so probably a false email ID.

Arv
_._


Re: Installing nextion 3.2P

Gerard
 

Evan,
yes, I looked, but it’s more about reducing consumption. On my µBitx, I can pull at least 5 amps. A friend gave me, a torus F114. I measured, 0.7 ohm and 2.32mHenry. I will test tomorrow if it removes the noise with the Nextion

Otherwise, I will start the calibration tests, but I prefer to use spectrum analyzer for that  because my ears no longer follow the acurate
 My dog doesn’t like frequency changes!. LOL.
Cdt


Membership scam request

Arv Evans
 

FYI...This is interesting.  

[BITX20] Message Approval Needed - melissa.franklin@... posted to BITX20@groups.io

This person(?) just posted a BITX20 membership request that included a long spam message.  Obviously a scammer, but it does represent a new way non-member scammers are trying to gain entry to our group.

The real Melisa Franklin is a respected Particle Physicist, so probably a false email ID.

Arv
_._


Re: uBitX V6 no transmit power #ubitxv6 #ubitx-help #tx

R. Tyson
 

Hi Evan,
Thank you for the reply and all the other contributions you have made to the group.

Just checked Q90 and it's lost interest in life... B 0.898V   C 0,89V  and E 11.51V.

Replacements should be here this week. Fine tip coming for soldering iron and some liquid flux also on it's way. Watched some videos on smd replacement and will get to try my hand at it in a few days. I have plenty of suitable diodes and will look at protecting Q90 as suggested.

Thanks again,

Reg                        G4NFR


Re: No ssb out in ubitx v3 #ubitx #v3 #power

Nikhil B
 

As mentioned in original post, CW works fine gives 5w out on 40m.
Yes i am aware of static voltages. I will try to measure them without blowing anything.😀😀


Re: No ssb out in ubitx v3 #ubitx #v3 #power

Nikhil B
 

Rx seems ok. Some stations come strong. Some weak. Antenna is EFHW in sloper configuration. Dont know how sensitive is the ubitx reciver. But i can definitely hear the strong stations clearly some 5/9 to 5/9+. 


Re: Caught in Antuino group subscription loop

 

Tom,

It occurred to me that your subscription may not have been approved as yet. Thats why its says you are a member but
till you are approved it wont let you post.

send a mail to Antuino+owner @ groups.io remove spaces before and after the @ sign.

Raj

At 07/09/2020, you wrote:
I have tried to join Antuino group but get a message that I already have joined. When I try to post, the message bounces sayng I am not a member! I am having a problem with a brand new Antuino that is not supported by the sparse documentation online. It appears the software is being developed faster than its documentation.

Tom AB6TN

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