ICOM A23 Transformer Specs

[[email protected]]

Would someone please give me the specs for the AC-DC transformer for
the ICOM A-23? I've misplaced mine and ICOM wants $40 for a
replacement. I can probably do better with a generic one from Radio
Shack. I need to know the polarity, DC voltage, and amps.

Thanks

(Sorry for the cross-post to rec.aviation.piloting, but that group
seems more active than the rest.)

[Jeremy Lew]

Mine says:
Input: 120VAC 60Hz 4.5W
Output: 12VDC 200 mA
Class 2 Transformer

> wrote in message
oups.com...
> Would someone please give me the specs for the AC-DC transformer for
> the ICOM A-23? I've misplaced mine and ICOM wants $40 for a
> replacement. I can probably do better with a generic one from Radio
> Shack. I need to know the polarity, DC voltage, and amps.
>
> Thanks
>
> (Sorry for the cross-post to rec.aviation.piloting, but that group
> seems more active than the rest.)
>

[Jeremy Lew]

Sorry, forgot the polarity:
Outer ring -, Inner ring +

"Jeremy Lew" > wrote in message
. ..
> Mine says:
> Input: 120VAC 60Hz 4.5W
> Output: 12VDC 200 mA
> Class 2 Transformer
>
> > wrote in message
> oups.com...
>> Would someone please give me the specs for the AC-DC transformer for
>> the ICOM A-23? I've misplaced mine and ICOM wants $40 for a
>> replacement. I can probably do better with a generic one from Radio
>> Shack. I need to know the polarity, DC voltage, and amps.
>>
>> Thanks
>>
>> (Sorry for the cross-post to rec.aviation.piloting, but that group
>> seems more active than the rest.)
>>
>
>

[rps]

Thanks!

[Gord Beaman]

"rps" > wrote:

>Thanks!

And these little 'wall warts' will work fine, I use a bunch here
on my many hand held ham trancseivers...just make sure that the
voltage is close and that the polarity is right (and the current
at or above specs)
--

-Gord.
(use gordon in email)

[Stubby]

Gord Beaman wrote:
> "rps" > wrote:
>
>> Thanks!
>
> And these little 'wall warts' will work fine, I use a bunch here
> on my many hand held ham trancseivers...just make sure that the
> voltage is close and that the polarity is right (and the current
> at or above specs)

I've always wondered why equipment manufacturers don't put a full wave
bridge (4 diodes) in the battery circuit so it doesn't matter how you
insert the batteries (or the polarity of a charger brick).

[Greg Farris]

In article >,
says...
>
>
>Sorry, forgot the polarity:
>Outer ring -, Inner ring +
>
You also need the size - these things come in a million different
sizes. The Outside Diameter on mine is 3.5mm.

GF

[MC]

Stubby wrote:

> Gord Beaman wrote:
>
>> "rps" > wrote:
>>
>>> Thanks!
>>
>>
>> And these little 'wall warts' will work fine, I use a bunch here
>> on my many hand held ham trancseivers...just make sure that the
>> voltage is close and that the polarity is right (and the current
>> at or above specs)
>
>
> I've always wondered why equipment manufacturers don't put a full wave
> bridge (4 diodes) in the battery circuit so it doesn't matter how you
> insert the batteries (or the polarity of a charger brick).

Gosh... That'd cost an extra 20c and might use around 1 sq cm
of board space. !



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[Michael Ware]

"Greg Farris" > wrote in message
...
> In article >,
> says...
> >
> >
> >Sorry, forgot the polarity:
> >Outer ring -, Inner ring +
> >
> You also need the size - these things come in a million different
> sizes. The Outside Diameter on mine is 3.5mm.
>
> GF
>
Look here. Cheep Cheep!

http://www.hosfeltelectronics.com/

[[email protected]]

Stubby > wrote:
: I've always wondered why equipment manufacturers don't put a full wave
: bridge (4 diodes) in the battery circuit so it doesn't matter how you
: insert the batteries (or the polarity of a charger brick).

Voltage drop. Even low-voltage schottky diodes will drop 0.3-0.4V. That's
like throwing away 33% of your 1.2v battery capacity.

-Cory

--

************************************************** ***********************
* Cory Papenfuss, Ph.D., PPSEL-IA *
* Electrical Engineering *
* Virginia Polytechnic Institute and State University *
************************************************** ***********************

[Mark Robinson]

wrote:
> Stubby > wrote:
> : I've always wondered why equipment manufacturers don't put a full wave
> : bridge (4 diodes) in the battery circuit so it doesn't matter how you
> : insert the batteries (or the polarity of a charger brick).
>
> Voltage drop. Even low-voltage schottky diodes will drop 0.3-0.4V. That's
> like throwing away 33% of your 1.2v battery capacity.

Measuring battery capacity in volts is pretty meaningless. Amp hours are us.

More significantly the device in question runs on 12 volts.

On the other side of the ledger a bridge would have two diodes in series giving
a total drop of 0.6-1.2 volts. This would give a considerable loss of transmit
power but only dissipate 5-10% of the battery capacity as heat.

cheers
Mark
Piled higher and Deeper.