b...@evoria.net said:
> The one thing that is missing is how to quantify the heat sink needs for a
> linear regulator. Any thoughts? IOW, is there some way to project how many
> square inches of heat sink needed for X watts to dissipate?
In the simple minded case, you can add up the (series) r
On 6/30/13 12:35 PM, Bob Stewart wrote:
"I believe the original problem was that the raw unregulated voltage may
be marginally too high for a conventional three-terminal to take safely"
Hi Ed,
Not really. The voltage is in line with the product specs for a 7812 (35V
max), as is the current I
m: ed breya
> To: time-nuts@febo.com
> Cc:
> Sent: Sunday, June 30, 2013 1:47 PM
> Subject: Re: [time-nuts] Regulator choices
>
> I believe the original problem was that the raw unregulated voltage may be
> marginally too high for a conventional three-terminal to take safely
I believe the original problem was that the raw unregulated voltage
may be marginally too high for a conventional three-terminal to take
safely. I have often encountered this problem, which is due to the
wide input range possible considering the worst-case line voltage
tolerance, transformer re
sop
> To: Discussion of precise time and frequency measurement
> Cc:
> Sent: Sunday, June 30, 2013 10:48 AM
> Subject: Re: [time-nuts] Regulator choices
>
> Maybe I read the original posting wrong but I think this thread has
> departed greatly from the original posting.
On 6/30/13 8:48 AM, Brian Alsop wrote:
Maybe I read the original posting wrong but I think this thread has
departed greatly from the original posting.
What I thought the posting said:
1) The already present transformer can produce ~20 V DC unregulated at
sufficient current.
2) The desire was to
Maybe I read the original posting wrong but I think this thread has
departed greatly from the original posting.
What I thought the posting said:
1) The already present transformer can produce ~20 V DC unregulated at
sufficient current.
2) The desire was to have a 12 V regulated at somewhat gre
On 6/30/13 7:43 AM, Charles P. Steinmetz wrote:
A three-terminal regulator (3TR) comprises (i) a voltage reference, (ii)
an error amp, and (iii) a current amplifier. There is no need to
duplicate the voltage reference or the error amp just because you need
more current. In fact, they can only l
Hi
A regulator needs to be specifically designed for parallel operation. If it's
not designed that way you will have a very hard time with it.
Bob
On Jun 29, 2013, at 3:18 AM, Hal Murray wrote:
> mc235...@gmail.com said:
>>> If one needs greater than 5 amps, the LM 1084 data
>>> sheet shows
mc235...@gmail.com said:
>> If one needs greater than 5 amps, the LM 1084 data
>> sheet shows how to easily parallel 2 or 3.
> I suppose that the same philosophy would apply to getting more power with a
> 7805 farm.
It may be a bit more complicated than that. You need some way to share the
lo
Le 29 juin 2013 à 06:12, Perry Sandeen a écrit :
>
>
> Wrote: Consider using a LT1083 7.5 Amp regulator.
>
> Well it is $14 each. The LM 1084 5 Amp 1s $2.43 each
>
> Hefty premium for an extra 2.5 Amps.
>
> If one needs greater than 5 amps, the LM 1084 data
> sheet shows how to easily
If you are in the US (maybe elsewhere) you can request two free samples.
Regards,
Brian
On 6/29/2013 04:12, Perry Sandeen wrote:
Wrote: Consider using a LT1083 7.5 Amp regulator.
Well it is $14 each. The LM 1084 5 Amp 1s $2.43 each
Hefty premium for an extra 2.5 Amps.
If one needs greater
Wrote: Consider using a LT1083 7.5 Amp regulator.
Well it is $14 each. The LM 1084 5 Amp 1s $2.43 each
Hefty premium for an extra 2.5 Amps.
If one needs greater than 5 amps, the LM 1084 data
sheet shows how to easily parallel 2 or 3.
What’s in your wallet?
Regards,
Perrier
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