Re: full rig power control unit
If I wranted to build a circuit like this one is there a software to help me layout a perfboard for the circuit.? I have LTSpice but I don't see anything to layout a perf board in it. It just may be that I don't know where that feature is in the software.
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73, W9KJO
Walter
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The TDA2822 obviously can not stand the 12V. After having blown two TDA2822's, I soldered a socket in its place, and made an adapter for the LM386, which never failed at 12V.
Here is the wiring:
LM386 pin:? ? ?2? -? 4? ?TDA2822 corresponding pin
? ? ? ? ? ? ? ? ? ? ? ?3? -? 7
? ? ? ? ? ? ? ? ? ? ? ?4? -? 4
? ? ? ? ? ? ? ? ? ? ? ?5? -? 1
? ? ? ? ? ? ? ? ? ? ? ?6? -? 2
Very simple and effective.
73's
HB9CGL Claude
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TDA2822 ill treatment test!
Having used TDA2822 for decades and never had a failure of any kind even with the chip running very hot,
I got this urge to short my uBitx audio output and see it the chip blows.
Power supply 13.6V
Current limit 2A
Touching the volume control leads produces a loud 50Hz hum. At this volume I directly shorted the wires
at the EP jack. The chip got mildly warm thats it.
No smoke or explosions ! I think that some may have got bad/defective/BY chips..
Cheers
--
Raj, vu2zap
Bengaluru, South India.
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Re: full rig power control unit
Is there a description and installation instructions for this mod?
Does someone actually have circuit boards that can be purchased for this?
--
73, W9KJO
Walter
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Re: full rig power control unit
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As found on a post, a component will sacrifice itself to protect the fuse. I suggest using a 7808 to supply the TDA amplifier with a lower voltage and also provide current limit protection. There is also the choice of using a complete cheap audio amplifier that one can find on ebay, bangood etc. They are cheap and it would probably cost you more to build it yourself. Regards Lawrence
On Thu, Mar 1, 2018 at 1:06 AM, Clark Martin <kk6isp@...> wrote: The chip is rated to work with a 4¦¸ load so a 4¦¸ resistor should do.? I doubt the chip would blow so fast that FB fuse wouldn¡¯t protect it.
Clark Martin
KK6ISP
> On Feb 28, 2018, at 4:00 PM, Jerry Gaffke via Groups.Io <jgaffke=[email protected]> wrote:
>
> Better be a pretty darn fast fuse.
>
> I'll go with an 8 ohm 1/2 watt series resistor to limit current.
> At least till I find a good source for TDA2822M chips.
> I'm fairly certain that resistor will offer sufficient protection.
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Re: full rig power control unit
VERY GOOD THANKS
HOW ABOUT A PARTS LIST, NO VALUES IN PRINT
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Jerry,
TDA2822D is LOW power compared to the 8 pin DIP. Check and compare.. the 16 pin DIP has even greater output!
Raj
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At 01-03-2018, you wrote: Ah, the TDA82822D part in the SOIC8 package is a good find.
Feeling much better now!
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Re: full rig power control unit
? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: Like us on Facebook! ? Moderator ¨C North American QRO Yahoo Group. ? email:? bill@... ? ?
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From: [email protected] [mailto:[email protected]] On Behalf Of wb7dmx@...
Sent: Thursday, March 1, 2018 12:32 AM
To: [email protected]
Subject: [BITX20] full rig power control unit ? I would like to build this unit, but the problem is I cannot print it out so I can read it. it is all fuzzy.
can anyone help me with this
bob bailey
WB7DMX
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full rig power control unit
I would like to build this unit, but the problem is I cannot print it out so I can read it. it is all fuzzy.
can anyone help me with this
bob bailey
WB7DMX
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On Feb 28, 2018, at 4:45 PM, Jerry Gaffke via Groups.Io < jgaffke@...> wrote:
Ah, the TDA82822D part in the SOIC8 package is a good find.
Feeling much better now!
Digikey has it for a bit over a dollar (Mouser says a minimum buy of 2000).
Maybe hfsignals will move to the more easily gotten SMD part if they ever roll the board.
Though I'm pretty sure I could solder the SMD into place with just some short wires,?
not bothering with the adapter board.
Mouser has it for $1.19, minimum buy of 1. ?The part number is listed as?TDA2822D013TR. ?The?data sheet doesn¡¯t show anything about the 013TR suffix so it¡¯s likely?referring to packaging variation (tube vs cut tape).
As to soldering it in directly, I do something like that. ?If it fits you can place it over the pads and solder the inner two pins on each side right to the pads then tack solder fine wire to the outer two pins on each side and then to the pads on the PCB. ?I use wire-wrap wire, sans insulation.
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Pilot Lamp Bulbs.
Here is a chart from
the past.? Guys that build tube guitar amps still buy them.
#47 was the most
popular when I was a kid, #44 to get more Light.
There would be a lot of
experimenting to see if they would work to protect the amp.
What impedance speaker you are using would be a big factor too.
73's
Mike, WA6ISP
?
On 2/28/2018 7:29 PM, Jerry Gaffke via
Groups.Io wrote:
Now that we have a
bunch of sources for the part,
I might be more inclined to experiment.
Resistance of a small incandescent bulb can go up a factor of 10
when it gets hot:? /g/BITX20/message/21901?
That or a fuse would be easier to replace than an 8 pin dip.
On Wed, Feb 28, 2018 at 07:10 pm, Michael Hagen wrote:
I wonder if a small light bulb. like the old standby
#47 could protect a speaker short.
Maybe some type fast lo-mass fast Thermistor???
Something that has small resistance, but goes up quickly
with a short.
Just thinking crazy.
Mike, WA6ISP
?
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
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Now that we have a bunch of sources for the part, I might be more inclined to experiment. Resistance of a small incandescent bulb can go up a factor of 10 when it gets hot:? /g/BITX20/message/21901? That or a fuse would be easier to replace than an 8 pin dip.
On Wed, Feb 28, 2018 at 07:10 pm, Michael Hagen wrote:
I wonder if a small light bulb. like the old standby #47 could protect a speaker short.
Maybe some type fast lo-mass fast Thermistor??? Something that has small resistance, but goes up quickly with a short.
Just thinking crazy.
Mike, WA6ISP
?
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I ordered on eBay. Ordered the TDA2822L and the TDA2822M.
The L comes from the US and I paid $3.99 for 5
The M comes from China and I paid $2.75 for 10.
So at least I will have some spares.
First ordered the Ms butbthat will be a long wait. So after I saw the La in the US I ordered those as well.
John
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I wonder if a small
light bulb. like the old standby #47 could protect a speaker
short.
Maybe some type fast
lo-mass fast Thermistor??? Something that has small
resistance, but goes up quickly with a short.
Just thinking crazy.
Mike, WA6ISP
On 2/28/2018 4:06 PM, Clark Martin
wrote:
The chip is rated to work with a 4¦¸ load so a 4¦¸ resistor should do. I doubt the chip would blow so fast that FB fuse wouldn¡¯t protect it.
Clark Martin
KK6ISP
On Feb 28, 2018, at 4:00 PM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
Better be a pretty darn fast fuse.
I'll go with an 8 ohm 1/2 watt series resistor to limit current.
At least till I find a good source for TDA2822M chips.
I'm fairly certain that resistor will offer sufficient protection.
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
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Tayda has the TDA2822L for $0.29 each with 126,973 available.? It¡¯s an 8 pin DIP.? Didn¡¯t see any glaring differences looking at the data sheets but another pair of eyes might see something.? Also I noticed that the datasheets show power outputs with a 4 ohm load with a max Vcc of 6 volts so a 4 ohm resistor might not provide protection with a Vcc of 12 volts. Mike K5ESS ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Clark Martin
Sent: Wednesday, February 28, 2018 6:03 PM
To: [email protected]
Subject: Re: [BITX20] U1 fried? The TDA2822D in effect replaces the ¡°M¡± version. ?It appears the same except it¡¯s an SMD part. ?You can get SMD to through hole adapter boards that would let you use one with the ?BitX. ?It would likely be cheaper than buying the ¡°M¡± version. An example of the adapter board: And plug headers to plug them into an IC socket (or solder in). ? ? On Feb 28, 2018, at 2:49 PM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote: ? So where did you get your spare TDA2822M's?
The TDA2822M is $7 for two on ebay, quite expensive for what it is.
Mainline distributors like Mouser and Digikey say it's discontinued.
ST no longer makes it, sources may be drying up.
My uBitx has a part on it marked "TDA2822M" but no ST logo, not sure who makes it.
?
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Re: Designing Maritime Radio
#bitx40
Hi Qonita,
This sounds like a good project, most of what you are doing will involve programming. Hardware wise you¡¯ll need to setup the output filters as either lowpass or bandpass. All Maritime and commercial services use Upper Sideband (USB) and they are also channelized. You will need to set your mode to USB and you could setup the encoder as a rit/clarifier. If you are in need of more than one channel the encoder switch can be used to change or step through channels. Also you could program the display to readout the channel number and frequency. This would streamline your code a lot and maybe leave room for decode program for the GPS position stream and DSC functions.?
Have fun with it and let us know how it goes.?
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NJM2073D seems to be a replacement for TDA2822, price is about one dollar:
73 Allard PE1NWL
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On Thu, March 1, 2018 01:45, Jerry Gaffke via Groups.Io wrote: Ah, the TDA82822D part in the SOIC8 package is a good find.
Feeling much better now!
Digikey has it for a bit over a dollar (Mouser says a minimum buy of
2000).
Maybe hfsignals will move to the more easily gotten SMD part if they ever
roll the board.
Though I'm pretty sure I could solder the SMD into place with just some
short wires,
not bothering with the adapter board.
The chip is rated to work with a 4?? load so a 4?? resistor should do. I
doubt the chip would blow so fast that FB fuse wouldn?€?t protect it. Yes, I think a 4 ohm resistor would probably do, I was getting rather
cautious when I saw how hard the M part was to obtain.
I'm suspicious that with a 12v supply it is close to the edge, they seem
to blow with little provocation.
Most of the datasheet seems to assume a max of 9v.
The fact that it works down to 1.8v reinforces this notion.
The fuse might protect it, depends on the failure mode.
The fuse costs about as much as the TDA2822D.
Jerry
On Wed, Feb 28, 2018 at 04:02 pm, Clark Martin wrote:
The TDA2822D in effect replaces the ?€?M?€? version. ??It appears the
same
except it?€?s an SMD part. ??You can get SMD to through hole adapter
boards
that would let you use one with the ??BitX. ??It would likely be cheaper
than buying the ?€?M?€? version.
??
??
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Re: Results of MAX9814 in uBitx
#ubitx
Thanks Tim.
One additional benefit of the MAX9814 solution is the reduction in TX pops both when switching in and out of Tx mode. How much reduction is dependant on the sensitivity. At 30% input volume it's total, at 7-10% it's partial but enough in my opinion.
All the best, 73, John
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Ah, the TDA82822D part in the SOIC8 package is a good find.
Feeling much better now!
Digikey has it for a bit over a dollar (Mouser says a minimum buy of 2000).
Maybe hfsignals will move to the more easily gotten SMD part if they ever roll the board.
Though I'm pretty sure I could solder the SMD into place with just some short wires,
not bothering with the adapter board.
> The chip is rated to work with a 4¦¸ load so a 4¦¸ resistor should do. I doubt the chip would blow so fast that FB fuse wouldn¡¯t protect it.
Yes, I think a 4 ohm resistor would probably do, I was getting rather cautious when I saw how hard the M part was to obtain.
I'm suspicious that with a 12v supply it is close to the edge, they seem to blow with little provocation.
Most of the datasheet seems to assume a max of 9v.
The fact that it works down to 1.8v reinforces this notion.
The fuse might protect it, depends on the failure mode.
The fuse costs about as much as the TDA2822D.
Jerry
toggle quoted message
Show quoted text
On Wed, Feb 28, 2018 at 04:02 pm, Clark Martin wrote:
The TDA2822D in effect replaces the ¡°M¡± version. ?It appears the same except it¡¯s an SMD part. ?You can get SMD to through hole adapter boards that would let you use one with the ?BitX. ?It would likely be cheaper than buying the ¡°M¡± version.
?
?
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Raj vu2zap
K9HZ
Skip Davis
Allard PE1NWL