On Mon, Mar 5, 2018 at 09:40 am, Walter wrote:
What kind of port in on the ubitx a micro usb or mini usb
Mini.? NOT the kind on your phone; one size up.
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What kind of port in on the ubitx a micro usb or mini usb
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73, W9KJO
Walter
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Re: CAT Support uBITX Firmware CEC Version 1.04 Release
#ubitx
Thanks for the release Ian, good job.
Joel
N6ALT
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Re: TDA2822 ill treatment test! Photo of blown TDA
Wouldn't you have to insulate the jack frame from ground?
That would be a return path from either the tip or ring to ground through the headphone transducer.
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Re: TDA2822 ill treatment test! Photo of blown TDA
Didn't have it on long enough to transmit. Turned on, saw the number on the DVM, turned off and said some unrepeatable things.
Vince.
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On 03/05/2018 11:56 AM, Jerry Gaffke via Groups.Io wrote: Good thing you didn't transmit, that would have given you something.
Something like smoke and flames where Q13 and R141 used to be on your
Bitx40.
Just in case others decide to replicate your experiment.
Not a good idea to run these rigs with much more than 12v.
(Finals are fine to 24v if you give them an adequate heatsink.)
Jerry
On Mon, Mar 5, 2018 at 08:34 am, Vince Vielhaber wrote:
B40, nothing. I accidently gave mine 20+ when a regulator shorted in
the worst possibly way. No damage done. With that audio chip I'll be
using a much better regulator! Although I may replace it before I
power it up. Then I can run a couple of experiments on the original.
--
Michigan VHF Corp.
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Re: TDA2822 ill treatment test! Photo of blown TDA
Good thing you didn't transmit, that would have given you something.
Something like smoke and flames where Q13 and R141 used to be on your Bitx40.
Just in case others decide to replicate your experiment.
Not a good idea to run these rigs with much more than 12v.
(Finals are fine to 24v if you give them an adequate heatsink.)
Jerry
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On Mon, Mar 5, 2018 at 08:34 am, Vince Vielhaber wrote:
B40, nothing. I accidently gave mine 20+ when a regulator shorted in the worst possibly way. No damage done. With that audio chip I'll be using a much better regulator! Although I may replace it before I power it up. Then I can run a couple of experiments on the original.
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Re: TDA2822 ill treatment test! Photo of blown TDA
On Mon, Mar 5, 2018 at 08:16 am, Clark Martin wrote:
But connect an amp output to the ring terminal will still burn it out if you plug in a mono plug, regardless of bridge or parallel.
You are correct, Clark.? This needs to be said loudly to any who might plug a TS connector into TRS jack, much like there are warnings about connecting power supply voltages backwards. A little experiment was conducted:? My ?B has an FCI TDA and a regulated 12V power supply.? When there is a dead short at the phones jack and the volume all the way up, the TDA gets too hot to touch (~130°F/55°C for me) within a few seconds.? With the volume turned to ?, I can hold my finger on the TDA for at least 30 seconds without any noticeable temperature rise. This is only one data point, but it suggests that FCI TDA is robust against shorting at ? volume for some time. If I had a few more of them and a socket, I would intentionally drive one to failure just to see what happens.
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Very cool, good job.? Persistence often pays off.
Think of it as mostly educational, so time well spent.
?
That 160m trace seems to have a strong third harmonic, which makes sense.
The 80m low pass filter would have a corner around halfway between 4 and 7 mhz,
so the 5.6 mhz third harmonic of 160m is sneaking through.
Not much evidence of a second harmonic, as one would expect from a push-pull amp.
Jerry, KE7ER
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On Mon, Mar 5, 2018 at 08:00 am, John wrote:
So it looks like everthing is working fine now, now only have to wait for my antenna tuner as my end fed has some pretty high values on the lower bands.
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CAT Support uBITX Firmware CEC Version 1.04 Release
#ubitx
All CAT Support uBITX Firmware CEC Version 1.04 Release, but?There is no major change compared to version 1.03. I released it for people looking for HEX files. The changes since 1.01 are as follows.- Reduce cpu usage rate- Change BFO Calibration step (50 to 5)- Change CW Frequency Display type??The more accurate frequency is displayed during CWL, CWU Mode.- Optimized source code and reduce program size (97% -> 95%)? I have free up memory space for WSPR on stand alone uBITX For more information, please see the link below. (You can download HEX file and latest version of uBITX Manager from the link below.)
?
-- Best 73 KD8CEC / Ph.D ian lee kd8cec@...
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Re: TDA2822 ill treatment test! Photo of blown TDA
There is no phasing issue with a bridge
On Mon, Mar 5, 2018 at 5:16 PM, Clark Martin <kk6isp@...> wrote: You could just drive both amps in parallel instead of bridge, this would avoid the phasing issue.
But connect an amp output to the ring terminal will still burn it out if you plug in a mono plug, regardless of bridge or parallel.
Has no one tried changing the TDA2822 to the “bridge” configuration??Wired to tip and ring there would be no ground connection and it would work with stereo or mono plug. ( I guess the phasing might be messed up with the sereo phones for voice)
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Re: TDA2822 ill treatment test! Photo of blown TDA
B40, nothing. I accidently gave mine 20+ when a regulator shorted in the worst possibly way. No damage done. With that audio chip I'll be using a much better regulator! Although I may replace it before I power it up. Then I can run a couple of experiments on the original.
Vince.
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On 03/05/2018 10:21 AM, Arvo KD9HLC via Groups.Io wrote: On Mon, Mar 5, 2018 at 07:04 am, Mvs Sarma wrote:
Again I wonder whether our friends who had this failure mode ,
applied any regulated 12V or using 12V or 12-0-12
secondary trafo , rectify, filter and use ( a peak if almost 18V- 1
or 2 diodes drop depending on fullwave and bridge.
Hello, Sarma.
What would blow first if someone plugged a 19V laptop supply into the ?B
or B40 power jack intended for 12V?
--
Michigan VHF Corp.
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Having the NANO board indicates that your BITX-40 is the later version.
Earlier version with analog VFO is identical except for the VFO.
_._
On Mon, Mar 5, 2018 at 4:43 AM, <davesters@...> wrote: How do I tell if my bitx40 has the raduino. It has a nano board so I assume it does.
It was originally shipped in Sept? 17. There was no coil in the center of the board where the display power port plugs in.?
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Re: TDA2822 ill treatment test! Photo of blown TDA
You could just drive both amps in parallel instead of bridge, this would avoid the phasing issue.
But connect an amp output to the ring terminal will still burn it out if you plug in a mono plug, regardless of bridge or parallel.
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On Mar 5, 2018, at 3:16 AM, ohwenzelph via Groups.Io < Ohwenzelph@...> wrote:
Has no one tried changing the TDA2822 to the “bridge” configuration??Wired to tip and ring there would be no ground connection and it would work with stereo or mono plug. ( I guess the phasing might be messed up with the sereo phones for voice)_._,_._,_
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Hello Jerry,
My bad, indeed on the probes there is a lttle switch and the one I used yesterday was indeed set to 10x. So the mentioned voltages should indeed be 10 times higher. That would make more sense with the to be expected power levels.
Here measurement of my cw signal at 160m. Will need some filtering for sure.
CW at 80m. Looks a lot cleaner.
So it looks like everthing is working fine now, now only have to wait for my antenna tuner as my end fed has some pretty high values on the lower bands.
Thanks for you help.
John
KG5WJQ
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i ordered Jan 5th and got my notice that it shipped today Mar 5th
Jim
wb4ctx
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Replacement rotary encoder
I am playing with different raduino replacements, and some require a different digital wiring harness. As I do not wish to continuously solder / resolder the encoder, I wish to get some replacement encoders to setup several harnesses.
Does anyone know where I can purchase 24 pulse encoders at a less than ridiculous price? Preferably in VK land, but I suppose that I am used to waiting for delivery now!
Cheers
Chris, VK7HCH
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Re: TDA2822 ill treatment test! Photo of blown TDA
On Mon, Mar 5, 2018 at 07:04 am, Mvs Sarma wrote:
Again I wonder whether our friends who had this failure mode , applied any regulated 12V? or using 12V or 12-0-12
secondary? trafo , rectify, filter and use ( a peak if almost 18V- 1 or 2? diodes drop depending on fullwave and bridge.
Hello, Sarma. What would blow first if someone plugged a 19V laptop supply into the ?B or B40 power jack intended for 12V?
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Re: Large Heat Sink of ubitx IRF 510's
Walter, A single heatsink is fine, but ensure you are using transistor insulating hardware.
Marco - KG5PRT?
On Mar 5, 2018 9:07 AM, "Walter" < W9KJO@...> wrote: Is it ok to put one large heat sink in for both IRF 510's or do the heat sink have to be separated from each other?
Thanks for your help
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73, W9KJO
Walter
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Large Heat Sink of ubitx IRF 510's
Is it ok to put one large heat sink in for both IRF 510's or do the heat sink have to be separated from each other?
Thanks for your help
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73, W9KJO
Walter
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Arvo W0VRA
Joel Caulkins/N6ALT