On 6/27/2013 9:09 PM, KD0GLS wrote:
/The PT5101 was the 5-volt version. I think there is (or used to be) a 3-amp
series as well, but I don't recall the part number. Maybe with a little
digging on the TI website you can find a suitable replacement that will meet
your needs. Last time I brow
Hi
If you are running a cheap switcher, you can have a *lot* of crud. 78L08's
aren't very good at rejecting high frequency "stuff".
Bob
On Jun 27, 2013, at 11:27 PM, Arthur Dent wrote:
>> The OCXO in the TBolt has a linear controller. It drops back to about
>> 150 to 250 ma on the +12 line a
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;> Bob - AE6RV
>>
>>
>>
>> ----- Original Message -
>>> From: Hal Murray
>>> To: Bob Stewart ; Discussion of precise time and
>>> frequency measurement
>>> Cc: hmur...@megapathdsl.net
>>> Sent: Thursday, June 27, 2013 2:24 PM
&
Oops, I sent this as a reply to Richard, but I had meant it for all. Also, in
the interim, Bob Camp had advised me that my OCXO load current was most likely
only 750ma instead of 1000ma. I checked it and it was about 690. Moral of the
story: check it, don't just rely on the datasheets. =( I
>The OCXO in the TBolt has a linear controller. It drops back to about
>150 to 250 ma on the +12 line after warmup. It's been at least 40
>years since I saw an on/off oven control in production ….
>
>Remember that the +12 feeds the oscillator circuit. The more crud on
>the 12 volts, the worse th
Cc:
>> Sent: Thursday, June 27, 2013 7:27 PM
>> Subject: Re: [time-nuts] +12 Volts 1A (plus a bit) supply?
>>
>> Hi
>>
>> The OCXO in the TBolt has a linear controller. It drops back to about 150 to
>> 250
>> ma on the +12 line after warmup. It&#
rom: Bob Camp
> To: Discussion of precise time and frequency measurement
> Cc:
> Sent: Thursday, June 27, 2013 7:27 PM
> Subject: Re: [time-nuts] +12 Volts 1A (plus a bit) supply?
>
> Hi
>
> The OCXO in the TBolt has a linear controller. It drops back to about 150 to
&
dary, as well.
>
>
> Bob - AE6RV
>
>
>
> - Original Message -
>> From: Hal Murray
>> To: Bob Stewart ; Discussion of precise time and frequency
>> measurement
>> Cc: hmur...@megapathdsl.net
>> Sent: Thursday, June 27, 2013 2:24 PM
___
> From: Robert Atkinson
>To: Bob Stewart ; Discussion of precise time and frequency
>measurement
>Sent: Thursday, June 27, 2013 4:09 PM
>Subject: Re: [time-nuts] +12 Volts 1A (plus a bit) supply?
>
>
>
>Hi Bob,
>As adrian has said, 20V off load is not really excess
se on the OCXO output.
Robert G8RPI.
From: Bob Stewart
To: Time Nuts
Sent: Thursday, 27 June 2013, 20:49
Subject: Re: [time-nuts] +12 Volts 1A (plus a bit) supply?
Hi Hal and other responders,
I believe that the OCXO uses an ON-OFF type of regulation. So,
.
Robert G8RPI.
From: Bob Stewart
To: Time Nuts
Sent: Thursday, 27 June 2013, 20:49
Subject: Re: [time-nuts] +12 Volts 1A (plus a bit) supply?
Hi Hal and other responders,
I believe that the OCXO uses an ON-OFF type of regulation. So, no, it doesn't
use 1A all the time. Maybe
witching board that people had
>> had good luck with. Maybe the brick is the best option.
>>
>> Bob
>>
>>
>>
>>
>>
>>>
>>> From: Chris Albertson
>>> To: Bob Stewart ; Disc
e brick is the best option.
Bob
From: Chris Albertson
To: Bob Stewart ; Discussion of precise time and frequency
measurement
Sent: Thursday, June 27, 2013 1:32 PM
Subject: Re: [time-nuts] +12 Volts 1A (plus a bit) supply?
You mean you have to many v
AArg, that is LT1083
On 6/27/2013 19:55, Brian Alsop wrote:
Consider using a LT0183 regulator. You can get two samples free from
Linear Technologies. It's good for 7.5 amps and will not need much of
a heat sink. A few resistors and caps are required to set the voltage
up to 12 volts.
An
Consider using a LT0183 regulator. You can get two samples free from
Linear Technologies. It's good for 7.5 amps and will not need much of
a heat sink. A few resistors and caps are required to set the voltage
up to 12 volts.
Another way is via a string of series diodes.
Regards,
Brian
On
the best option.
>
> Bob
>
>
>
>
>
>>
>> From: Chris Albertson
>>To: Bob Stewart ; Discussion of precise time and
>> frequency measurement
>>Sent: Thursday, June 27, 2013 1:32 PM
>>Subject: Re: [time-nuts] +12 Volts
y, June 27, 2013 2:24 PM
> Subject: Re: [time-nuts] +12 Volts 1A (plus a bit) supply?
>
>
> b...@evoria.net said:
>> The transformer gives me about 20 volts DC out. Dropping 8 volts at 1 amp
>> is just a lot of power to void with a resistor. I'd like to avoid
&
b...@evoria.net said:
> The transformer gives me about 20 volts DC out. Dropping 8 volts at 1 amp
> is just a lot of power to void with a resistor. I'd like to avoid having
> that much waste heat in the unit.
Does it really take 1A after it's warmed up?
--
These are my opinions. I hate sp
>> To: Bob Stewart ; Discussion of precise time and frequency
>> measurement
>> Sent: Thursday, June 27, 2013 1:32 PM
>> Subject: Re: [time-nuts] +12 Volts 1A (plus a bit) supply?
>>
>>
>>
>>
>>
>> You mean you have to many volts for a 12V r
good luck with. Maybe
the brick is the best option.
Bob
>
> From: Chris Albertson
>To: Bob Stewart ; Discussion of precise time and frequency
>measurement
>Sent: Thursday, June 27, 2013 1:32 PM
>Subject: Re: [time-nuts] +12 Volts
You mean you have to many volts for a 12V regulator to drop> That's easy
to fix, use a resister in series. Make the resister par of an RC filter
and cleaner power in the process.
I use a plug-in power brink from an old notebook computer. I think mine
outputs 15V and then this gets dropped to 12
I'm using an HP 37203A case (half size) for my GPSDO project, but the output
from the transformer is just too high to get +12V @ 1A to power the OCXO from a
simple regulator. So, what are people using for quick and dirty 12V 1+A power
supplies? I'm not in love with the idea of using a wall war
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