[ARC5] [Milsurplus] Cool New DC-DC Converter

Bob kb8tq kb8tq at n1k.org
Thu Mar 15 11:22:51 EDT 2018


Hi

These seem to still be around:

https://www.batterymart.com/p-2v-2_5ah-hawker-sealed-lead-acid-battery.html?gclid=EAIaIQobChMIyuWz3NDu2QIVhkGGCh1alAPnEAQYBCABEgJNNfD_BwE <https://www.batterymart.com/p-2v-2_5ah-hawker-sealed-lead-acid-battery.html?gclid=EAIaIQobChMIyuWz3NDu2QIVhkGGCh1alAPnEAQYBCABEgJNNfD_BwE>

There are a lot of other “round” lead acid’s out there. 

Bob

> On Mar 15, 2018, at 10:58 AM, Scott Robinson <spr at earthlink.net> wrote:
> 
> Hi Mike,
> 
> I have found 2V gel-cells hard to get, 6V easier. Bummer, because I use one in my GE model 260 portable, which use a vibrator to make B+ and runs the 1.4V filaments directly off the 2V bttery via an RF noise filter with the right DC resistance.
> 
> Peace,
> 
> Scott
> 
> On 3/15/18 7:22 AM, Michael Bittner wrote:
>> Right on, Mike.  I could use it right now for my farm radios, portables and LF beacon receivers that use 1.4-Volt filament tubes and typically require A batteries of 1.5 V for parallel filaments or, 7.5 V or 9 V for series string filaments.
>> However, my dream B+ power supply for these sets would run off of a rechargeable 2-Volt gel cell.
>> Mike, W6MAB
>>    ----- Original Message -----
>>    *From:* Michael Hanz <mailto:aaf-radio-1 at aafradio.org>
>>    *To:* D C _Mac_ Macdonald <mailto:k2gkk at hotmail.com> ; David Stinson
>>    <mailto:arc5 at ix.netcom.com>
>>    *Cc:* ARC-5 <mailto:arc5 at mailman.qth.net> ;
>>    milsurplus at mailman.qth.net <mailto:milsurplus at mailman.qth.net>
>>    *Sent:* Thursday, March 15, 2018 6:55 AM
>>    *Subject:* Re: [Milsurplus] [ARC5] Cool New DC-DC Converter
>>    I assume as a supply for battery sets that require both A and B
>>    batteries, Mac.
>>      - Mike  KC4TOS
>>    On 3/15/2018 9:44 AM, D C _Mac_ Macdonald wrote:
>>> 
>>>    If you already have the 12VDC, why would you even be concerned
>>>    about using the low voltage output?  I assume (yeah, I know) that
>>>    one might be considering changing command set receivers to 12V
>>>    filaments, but don't know why you would want to have regulated
>>>    filament voltage except maybe for the local oscillator/mixer.
>>> 
>>> 
>>>    73 de Mac, K2GKK/5
>>>    (Since 30 Nov '53)
>>>    Oklahoma City, OK
>>>    USAF Retired 61-81
>>>    FAA Retired 94-10
>>> 
>>> 
>>>    ------------------------------------------------------------------------
>>>    *From:* arc5-bounces at mailman.qth.net
>>>    <arc5-bounces at mailman.qth.net> on behalf of Peter Gottlieb
>>>    <kb2vtl at gmail.com>
>>>    *Sent:* Thursday, March 15, 2018 08:34
>>>    *To:* David Stinson
>>>    *Cc:* ARC-5; milsurplus at mailman.qth.net
>>>    *Subject:* Re: [ARC5] Cool New DC-DC Converter
>>>    Sounds useful. Question:  how much more current does a tube
>>>    filament take when cold?
>>> 
>>> 
>>>    Peter
>>> 
>>>    > On Mar 15, 2018, at 8:37 AM, David Stinson <arc5 at ix.netcom.com> wrote:
>>>    >     > This DC-DC converter looks really interesting.  It
>>>    > inputs 12V and can source a regulated from 1.25V
>>>    > to 12V at 3A for filaments and regulated 150V to
>>>    > 420V at up to 60mA for B+.  Gonna get me one of
>>>    > these.
>>>    > https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ebay.com%2Fitm%2F173034019336&data=02%7C01%7C%7C9450b4624bca42f4892d08d58a7988e3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636567176942236244&sdata=UIr0oP1%2BuK5czkkVQd1eSPEvvaLocFUPJqZdItiEl%2Fc%3D&reserved=0
>>>    >     > 73 Dave AB5S
>>> 
>>    ------------------------------------------------------------------------
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