Sony ICF-2010 with a 5 volt USB adaptor
Geoffrey S. Mendelson
4.5 volt Sony adaptor which has not been used in about 14 years.
Since the electrical system here is 230 volts, I either need to replace the
adaptor or use a transformer.
5 volt adaptors to charge things that require a USB port are common here,
and they have the advantage of being autoswitching multi voltage, so if I
were to take the radio overseas, it would work with at most a plug change.
Has anyone run the radio with a 5 volt adaptor? Does it have a problem with
the 1/2 volt overage?
Thanks in advance,
Geoff.
--
Geoffrey S. Mendelson N3OWJ/4X1GM
To help restaurants, as part of the "stimulus package", everyone must order
dessert. As part of the socialized health plan, you are forbidden to eat it. :-)
dave
> I have a Sony ICF-2010, late 1980's vintage. I have with it a 120 volt in
> 4.5 volt Sony adaptor which has not been used in about 14 years.
>
> Since the electrical system here is 230 volts, I either need to replace the
> adaptor or use a transformer.
>
> 5 volt adaptors to charge things that require a USB port are common here,
> and they have the advantage of being autoswitching multi voltage, so if I
> were to take the radio overseas, it would work with at most a plug change.
>
> Has anyone run the radio with a 5 volt adaptor? Does it have a problem with
> the 1/2 volt overage?
>
> Thanks in advance,
>
> Geoff.
>
Should be fine. A fresh alkaline C battery is over 1.6 VDC on a battery
tester.
John Smith
> ...
> Has anyone run the radio with a 5 volt adaptor? Does it have a problem with
> the 1/2 volt overage?
>
> Thanks in advance,
>
> Geoff.
>
If you are really worried, perhaps better safe than sorry(?), drop a
silicon diode in the line, in series with the supply, will drop the
voltage ~0.68-0.75V.
Regards,
JS
RHF
> On 9/11/2010 3:04 PM, Geoffrey S. Mendelson wrote:
>
> > ...
> > Has anyone run the radio with a 5 volt adaptor? Does it have a problem with
> > the 1/2 volt overage?
>
> > Thanks in advance,
>
> > Geoff.
>
- silicon diode in the line, in series with the supply, will drop the
- voltage ~0.68-0.75V.
-
- Regards,
- JS
JS - Why a Silicon Diode versus a Resistor
in the DC Output Line ? - iwtk ~ RHF
.
arthr...@webtv.net
Because a silicon junction voltage drop is fairly stable 0.6-0.7
VDC,in general. A small light bulb (here we go,another incandescent!)
in series is fun to experiment with as well,since the current
consumption will be visible.
dave
John Smith
>>
>> JS - Why a Silicon Diode versus a Resistor
>> in the DC Output Line ? - iwtk ~ RHF
>> .
> The resistance needed varies with current draw?
To drop the voltage from 5 to 4.4-4V ... as I originally said ... the
voltage drop in silicone diodes is around 6.8, it can vary some due to
type, manufacturing process, etc.
Regards,
JS
RHF
Ah OK - I have always figured the required
Voltage Drop needed for the Radio at normal
Audio Listening Level and used a Resistor
-example- 12 VDC down-to 9 VDC -or 6 VDC.
Here you are using a Silicon Diode because it has
the specific ~0.6/0.8 Volt Drop for this application.
http://en.wikipedia.org/wiki/Diode
~ RHF
.
John Smith
> ...
> Ah OK - I have always figured the required
> Voltage Drop needed for the Radio at normal
> Audio Listening Level and used a Resistor
> -example- 12 VDC down-to 9 VDC -or 6 VDC.
>
> Here you are using a Silicon Diode because it has
> the specific ~0.6/0.8 Volt Drop for this application.
> http://en.wikipedia.org/wiki/Diode
>
> ~ RHF
> .
Yes, if you want to drop the voltage further, just drop more silicon
diodes in series ...
Regards,
JS
RHF
HUMmmm the Cost of one Resistor
or the Cost of many Diodes . . .
Somewhere 'somewhen' long ago : I was told
taught to Divide my Dropping Resistor Value by
Two and use Two Resistors in the DC Supply line;
one in each Wire; so that the Battery would be
'isolated' and 'floating' ?
+12VDC [B]__/////__+Radio-__/////__[B] -12VDC
.
~ RHF
.
Reinhard Zwirner
[...]
> > Yes, if you want to drop the voltage further, just drop more silicon
> > diodes in series ...
> >
> > Regards,
> > JS
>
> HUMmmm the Cost of one Resistor
> or the Cost of many Diodes . . .
The voltage drop across a diode/diodes is more or less current
independend while the voltage drop across a resistor depends on the
current through that resistor. High volume -> big current -> big
voltage drop -> low supply voltage; low volume -> low current ->
small voltage drop -> high (maybe too high) supply voltage.
HTH
Reinhard
John Smith
>> ...
>> Yes, if you want to drop the voltage further, just drop more silicon
>> diodes in series ...
>>
>> Regards,
>> JS
>
> HUMmmm the Cost of one Resistor
> or the Cost of many Diodes . . .
>
> ~ RHF
> .
NO! The resistor(s) will vary widely with load, the diodes would, at
least not to such a significant degree ... for most intents and
purposes, you can consider them a "fixed voltage drop."
Regards,
JS
John Smith
> ...
> I was taught six tenths for a Si diode rectifier, three tenths for Ge.
>
> To keep the voltage constant, while current draw varies, requires a
> variable resistance. I assume this happens inside the diode.
The old germanium I have measured tended to be close to 0.5v. The
schottky ~0.2 = ~0.4 unless under heavy loads ... and of course, there
are exemptions to the rule ...
Regards,
JS
dave
It's been a while.
RHF
- It's been a while.
Yeah that's for sure - most likely sometime in
the last century for most/all of us . . . ;;-}} ~ RHF
So for a 12VDC to 9 VDC Voltage Drop at 1000 mA
[1 Amp] that would be a total of Five Silicon Diodes;
with Two in one wire (+) and Three in the other wire (-).
-versus-
My present 3 x One Ohms 5 Watt WW Resistors*
with Two in one wire (+) and One in the other wire (-).
*This is what I presently have to Drop the 12 VDC
Battery Voltage down to the Radio's 9 VDC Input
Voltage of the Grundig Satellit 800-M Radio.
GS 800-M's DC Power Requirements :
7 to 10 VDC @ 1 Amp
-via- AC Adapter or Battery
-or- 6 x 1.5 VDC "D" Batteries*
* 9 VDC as low as 5.7 VDC
GS 800-M's Current Requirements @ 9 VDC
with 1/4 Watt Audio Output Level : 510 mA
(LCD Lights Off) to 850 mA (LCD Lights On)
GS 800-M's AC Adapter is Rated :
9 VDC @ 1500 mA Max.
FWIW the GS800-M's Adapter's VDC Line Input
is about 10.4 VDC with the Radio "On" and normal
Audio.
While using the 12 VDC Battery the VDC Line
Input is about 9.9 VDC with the Radio "On" and
normal Audio.
Guess I will have to go down the Grade to the
RadioShack in Sonora, CA to see about some
Silicon Diodes to try-out and see for myself.
http://www.radioshack.com/search/index.jsp?kwCatId=&kw=silicon%20diode&origkw=Silicon%20Diode&sr=1
? any suggestions ?
.
.
I know that the Icom IC-R75 Receiver should
be able to run directly off the 12 Volt Battery;
but never got around to trying it with a larger
Auto/Car Size Battery.
Power Supply : 13.8 VDC
Current Requirement : Standby 0.9 Amp
and Maximum Audio 1.1 Amp
.
.
John Smith
Yes, about that. I would drop in four in the POSITIVE lead, before
hooking up the radio, and measure the voltage, then add the 5th, if
needed to get you the 9v.
I would NOT drop any diodes in the negative lead, you will raise the
ground potential of the radios ground the equivalent the diodes voltage
drop, this is simply a factor which the radio was not designed for and
can affect performance--not necessarily harm the radio ...
Regards,
JS
dave
Be careful. You can easily make a voltage doubler by accident when
messing with rectifiers in series.
John Smith
Not at the current draw the radio will require, for very low current,
and if you start chucking in large caps you are NOT CONNECTING
CORRECTLY, maybe ... don't use any caps, or only one across the diodes
output and don't worry about all that ... it just adds to obfuscation.
Regards,
JS
RHF
> > ? any suggestions ?
> > .
> > .
> > I know that the Icom IC-R75 Receiver should
> > be able to run directly off the 12 Volt Battery;
> > but never got around to trying it with a larger
> > Auto/Car Size Battery.
> > Power Supply : 13.8 VDC
> > Current Requirement : Standby 0.9 Amp
> > and Maximum Audio 1.1 Amp
> > .
> > .
>
> Yes, about that. I would drop in four in the POSITIVE lead, before
> hooking up the radio, and measure the voltage, then add the 5th, if
> needed to get you the 9v.
>
> I would NOT drop any diodes in the negative lead, you will raise the
> ground potential of the radios ground the equivalent the diodes voltage
> drop, this is simply a factor which the radio was not designed for and
> can affect performance--not necessarily harm the radio ...
>
> Regards,
> JS
1 - The Battery is Floating and Isolated from
Everything in a Wooden Box using a DPDT
Knife Switch . . .
http://groups.google.com/group/rec.radio.shortwave/msg/093fa022521ffe71
2 - When the Radio is connected to the Battery :
The Radio's only connections are to :
* the Antenna Wire
* the Earthen Ground Connection
* Small 5" Speaker which is Floating and Isolated
{Wooden Box and Shielded Lead} -or- Headphones
The Radio Is NOT Connected to AC Power
and the House's AC Power Ground.
~ RHF
.