[ARC5] ARC5 Digest, Vol 119, Issue 27

Mon Dec 23 08:02:54 EST 2013

more again on that 48v dc to dc converter

The quoted one seems to be unavailable now?

there are others advertised e.g. 3 to 36 volts dc in and 3 to 36 out but the 
output is not isolated like the one quoted to enable putting 2 in series to 
make the 96volts..am I right that you cannot series the 'unisolated' ones to 
enable the voltage doubling?

also can someone clarify if the 3 to 36 volt one will provide 36 volts 
output from just 3 volts input as I do not understand this or do you need 
more than the output voltage in the input to secure the high output?

sorry for labouring this but as Dave says it is a very useful device to 
enable the ARC5 rxs to be run off one source and the current draw is not 
high

73 and Happy Christmas to all de Pat/EI7CN

-----Original Message----- 
From: arc5-request at mailman.qth.net
Sent: Sunday, December 22, 2013 7:28 PM
To: arc5 at mailman.qth.net
Subject: ARC5 Digest, Vol 119, Issue 27

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Today's Topics:

   1. More on that +/- 48 Volt DC-DC Converter (David Stinson)
   2. Re: Power Supply Filter Question (Ben Hall)
   3. Re: Power Supply Filter Question (Ben Hall)
   4. Re: Power Supply Filter Question (n2lxm at juno.com)
   5. Re: Power Supply Filter Question (J. Forster)
   6. Re: Power Supply Filter Question (J. Forster)
   7. Re: Power Supply Filter Question (Mike Feher)

----------------------------------------------------------------------

Message: 1
Date: Sun, 22 Dec 2013 11:58:06 -0600
From: "David Stinson" <arc5 at ix.netcom.com>
To: "ARC-5 List" <arc5 at mailman.qth.net>
Subject: [ARC5] More on that +/- 48 Volt DC-DC Converter
Message-ID: <43BE4C38DC7142E1B8F9DF5F722A7D4A at CompaqSR5710F>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original

A few people asked so here's a photo of the little "brick"
supplying +97 VDC to the ham-verted BC-454.
Works excellent and plenty of audio.
Here's a photo of it just "tacked" onto the back deck
of the receiver on my cluttered work bench:

http://home.netcom.com/~arc5/dcdcpwr.jpg

The receiver works entirely on 12 VDC.
Even powered it from a Gel Cell for awhile.
Since there is no filtering, there are birdies at
each harmonic of the switching freq- about 160 KC.
None of them have been a problem so far and a pot
on the "trim" input would likely move any birdie if it
was an issue.

73 DE Dave AB5S

------------------------------

Message: 2
Date: Sun, 22 Dec 2013 12:11:20 -0600
From: Ben Hall <kd5byb at kd5byb.net>
To: arc5 at mailman.qth.net
Subject: Re: [ARC5] Power Supply Filter Question
Message-ID: <52B72B48.7050301 at kd5byb.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Hi John and list,

Sounds very interesting.  Where can I find information on the Beta-C filter?

On 12/21/2013 7:37 PM, J. Forster wrote:
> A Beta-C filter is relative simple and more than adequate. With a couple
> of protective diodes, it's just about bulletproof. The version with a
> Zener will easily add sufficient regulation.

thanks,
ben

------------------------------

Message: 3
Date: Sun, 22 Dec 2013 12:25:30 -0600
From: Ben Hall <kd5byb at kd5byb.net>
To: arc5 at mailman.qth.net
Subject: Re: [ARC5] Power Supply Filter Question
Message-ID: <52B72E9A.3080208 at kd5byb.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

On 12/21/2013 7:18 PM, Dennis Monticelli wrote:
> I can agree with that statement.  The circuits are reproducible and
> components affordable, but the gotcha's should a tube-trained person try 
> to
> roll his own design are just too numerous.  The high power FETs do have
> better SOA, but robustness issues remain.

Good morning Dennis and all,

I've been looking for a robust high-voltage regulator circuit for some
time for use with vacuum-tube gear.

One reason is the cost of filter chokes - a nice, new Hammond unit can
be $40 or so for an enclosed unit.

Another reason is that I have a plethora of used, vacuum tube
transformers that always seem to have HV secondaries that, even with a
choke-input configuration, produce way more voltage that I require.  :(

Some time ago I came across this post of diyAudio.  If you can sift the
good information from the "audiophoolery," you can actually find some
interesting things there.

One of those interesting things was a post entitled "21st Century Maida
Regulator."

Years ago, Mike Maida wrote National Semiconductor Linear Brief 47,
describing a high-voltage regulator based on the wonder LM317.

This thread presents an updated version of the Maida regulator, using a
Linear Technology LT3080 regulator at its heart:

<http://www.diyaudio.com/forums/tubes-valves/209067-21st-century-maida-regulator.html>

I have built two of these on a PC board of my own design - one for 90
VDC output, the other for 500 VDC output.  Both seem to work very well.

thanks much and 73,
ben, kd5byb

------------------------------

Message: 4
Date: Sun, 22 Dec 2013 13:50:21 -0500
From: <n2lxm at juno.com>
To: kd5byb at kd5byb.net
Cc: arc5 at mailman.qth.net
Subject: Re: [ARC5] Power Supply Filter Question
Message-ID: <AABKMQPFUAGSGPJS at smtpout02.vgs.untd.com>
Content-Type: text/plain; charset=us-ascii

Good Afternoon All,

        I have used High Power Fet as Voltage regulators for quit some
time now. If the circuit is design and build well there is no reason to
be leave there will be any problems. For the most part they can be built
small enough to hid under the hood so to speak.  for small current
requrement of an ARC 5 Receiver, a IRF 520 Fet and a few dollars of
Zeners could be used to provide a almost ripple free DC voltage. Just as
a side note, I work for a High Power Power Supply manufacture as a
Customer Service Technician. As such I work on power systems that range
from 750 watts to 100,000 watts. Ninety percent of our systems are
switchers and use a variety of IGBT Fets.

                                Jeff N2LXM
                  AMATEUR RADIO OPERATOR
                                AMERICAN
                                  PATRIOT
                  Proud Father of two US MARINES

____________________________________________________________
Do THIS before eating carbs &#40;every time&#41;
1 EASY tip to increase fat-burning, lower blood sugar & decrease fat storage
http://thirdpartyoffers.juno.com/TGL3141/52b734b268b7434b22d0est02vuc

------------------------------

Message: 5
Date: Sun, 22 Dec 2013 11:09:19 -0800 (PST)
From: "J. Forster" <jfor at quikus.com>
To: "Ben Hall" <kd5byb at kd5byb.net>
Cc: arc5 at mailman.qth.net
Subject: Re: [ARC5] Power Supply Filter Question
Message-ID:
<43212.12.226.214.5.1387739359.squirrel at popaccts.quikus.com>
Content-Type: text/plain;charset=iso-8859-1

It's basically an emitter follower.

The pass traqnsistor's collector goes to the supply; the emitter to the 
load.

One version uses a resistor between coll. and base & a capaciytor to
ground. This filters ripple, but does not regulate. It effective
capacitance is roughly beta x cap value.

Another version uses the same resistor position, and one or more zeners in
place of the cap. This regulates the output voltage.

-John

===============

> Hi John and list,
>
> Sounds very interesting.  Where can I find information on the Beta-C
> filter?
>
> On 12/21/2013 7:37 PM, J. Forster wrote:
>> A Beta-C filter is relative simple and more than adequate. With a couple
>> of protective diodes, it's just about bulletproof. The version with a
>> Zener will easily add sufficient regulation.
>
> thanks,
> ben
>
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>

------------------------------

Message: 6
Date: Sun, 22 Dec 2013 11:14:23 -0800 (PST)
From: "J. Forster" <jfor at quikus.com>
To: n2lxm at juno.com
Cc: arc5 at mailman.qth.net
Subject: Re: [ARC5] Power Supply Filter Question
Message-ID:
<43283.12.226.214.5.1387739663.squirrel at popaccts.quikus.com>
Content-Type: text/plain;charset=iso-8859-1

I agree. These days, a cheap power FET is a better choice than a bipolar
transistor.

-John

=============

> Good Afternoon All,
>
>         I have used High Power Fet as Voltage regulators for quit some
> time now. If the circuit is design and build well there is no reason to
> be leave there will be any problems. For the most part they can be built
> small enough to hid under the hood so to speak.  for small current
> requrement of an ARC 5 Receiver, a IRF 520 Fet and a few dollars of
> Zeners could be used to provide a almost ripple free DC voltage. Just as
> a side note, I work for a High Power Power Supply manufacture as a
> Customer Service Technician. As such I work on power systems that range
> from 750 watts to 100,000 watts. Ninety percent of our systems are
> switchers and use a variety of IGBT Fets.
>
>
>                                 Jeff N2LXM
>                   AMATEUR RADIO OPERATOR
>                                 AMERICAN
>                                   PATRIOT
>                   Proud Father of two US MARINES
>
> ____________________________________________________________
> Do THIS before eating carbs &#40;every time&#41;
> 1 EASY tip to increase fat-burning, lower blood sugar & decrease fat
> storage
> http://thirdpartyoffers.juno.com/TGL3141/52b734b268b7434b22d0est02vuc
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>

------------------------------

Message: 7
Date: Sun, 22 Dec 2013 14:28:21 -0500
From: "Mike Feher" <n4fs at eozinc.com>
To: <jfor at quikus.com>, "'Ben Hall'" <kd5byb at kd5byb.net>
Cc: arc5 at mailman.qth.net
Subject: Re: [ARC5] Power Supply Filter Question
Message-ID: <[email protected]>
Content-Type: text/plain; charset="us-ascii"

If I remember right, this is known as the Miller effect. - Mike

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960

-----Original Message-----
From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
Behalf Of J. Forster
Sent: Sunday, December 22, 2013 2:09 PM
To: Ben Hall
Cc: arc5 at mailman.qth.net
Subject: Re: [ARC5] Power Supply Filter Question

It's basically an emitter follower.

The pass traqnsistor's collector goes to the supply; the emitter to the
load.

One version uses a resistor between coll. and base & a capaciytor to ground.
This filters ripple, but does not regulate. It effective capacitance is
roughly beta x cap value.

Another version uses the same resistor position, and one or more zeners in
place of the cap. This regulates the output voltage.

-John

===============

> Hi John and list,
>
> Sounds very interesting.  Where can I find information on the Beta-C
> filter?
>
> On 12/21/2013 7:37 PM, J. Forster wrote:
>> A Beta-C filter is relative simple and more than adequate. With a
>> couple of protective diodes, it's just about bulletproof. The version
>> with a Zener will easily add sufficient regulation.
>
> thanks,
> ben
>
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net Please help support this email
> list: http://www.qsl.net/donate.html
>
>

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End of ARC5 Digest, Vol 119, Issue 27
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