[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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