[ARC5] BC-453-B Power Supply

Thu Apr 6 12:12:57 EDT 2023

Rich, what are the values for C1-C4? I was just eyeing a 28VAC filament
transformer and thinking about using one of those DC-DC boost devices, but
this is much simpler.

Dave N9ZC

On Wed, Apr 5, 2023, 10:31 PM Rich Post <kb8tad at gmail.com> wrote:

> Since the original question was power supply.  Here's a simple method I
> have used, a 24 volt transformer for the original series filaments.  The
> transformer also feeds a voltage quadrupler with common ground.  The 200
> volt electrolytic capacitors were recycled from a couple of computer power
> supplies.  If you want more than 134 volts, the circuit can be extended to
> a fifth cap.
>
> 73 de Rich KB8TAD
>
> [image: Half-wave quadrupler module with common ground.JPG]
> [image: Voltage quadrupler power supply schematic.jpg]
>
>
> On Wed, Apr 5, 2023 at 10:53 PM <hwhall at compuserve.com> wrote:
>
>> Here's a look at another way to do a recap. The terminal board work was
>> accomplished by Canadian Aviation Electronics (CAE) in 1955.
>>
>> Wayne
>> WB4OGM
>>
>> -----Original Message-----
>> From: Mark K3MSB <mark.k3msb at gmail.com>
>> To: Robert P. Meadows <rpmeadow at bellsouth.net>
>> Cc: Dennis Monticelli <dennis.monticelli at gmail.com>;
>> hwhall at compuserve.com; arc5 at mailman.qth.net
>> Sent: Wed, Apr 5, 2023 4:52 am
>> Subject: Re: [ARC5] BC-453-B Power Supply
>>
>> " Do the “RECAP”  correctly"
>>
>> Using Tom Frobase's cap replacement kit is not the "correct" way to
>> refurbish a receiver;  it is an alternate way.
>>
>> Tom's kits are very nice as I've looked at them before but on all the
>> receivers I've recapped I've used just solder lugs or terminal strips.
>> I've never had any problems.
>>
>> As Tom's video says, the only one that's going to know what's inside the
>> radio is yourself, so what it looks like doesn't matter, and I agree with
>> him.  In the decades I've been restoring radios, never once have I had
>> someone come into my shack and ask to look under the chassis.   If you're a
>> purist,  then you will certainly not want to use solder lugs, terminal
>> strips, or Tom's kit as none of them are authentic -- you'll restuff the
>> potted caps.   I never restuff the caps; I just save them in a bag with the
>> radio's serial number on it so when I sell it (or croak...) and my radios
>> go to the next person they'll have the option to repot.
>>
>> Interestingly, Tom seems to make a contradictory statement later in the
>> video.  He indicates that when using terminal strips etc there's no
>> structural way to put the capacitors in the radio and it looks like
>> crap.
>>
>> If you're going to use your radio in an airplane going through air combat
>> maneuvering then I'd worry about a good structural way to mount the
>> replacement capacitors.  Otherwise, solder lugs and terminal strips will be
>> more than adequate.
>>
>> I disagree with converting the filaments to 12V - that's just my opinion;
>> YMMMV.   Just buy or build a 28V supply and build a B+ supply.  I used a HB
>> HV supply for years then went over to an HP-23 that I picked up at
>> hamfest;  the LV output on the HP-23 with a dropping resistor works great.
>>
>> Don't get me wrong, I'm not bashing Tom's kits -- they are very nice.
>> If you have a supply of caps, solder lugs and terminal strips which a lot
>> of us have, I would not pony up for the price of his cap replacement kit.
>> If you don't,  Tom's kits looka to be a good one stop shopping solution.
>>
>> 73 Mark K3MSB
>>
>>
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>>
>> On Tue, Apr 4, 2023 at 10:47 PM Robert P. Meadows <rpmeadow at bellsouth.net>
>> wrote:
>>
>> Do the “RECAP”  correctly, purchase Tom Frobase’s capacitor kit, believe
>> it is kitparts or such.  Slick printed circuit boards that hold the
>> capacitors and fit the existing holes from removing the beeswax filled
>> leaky tubs.  Works well, and I do believe that is what Aircraft Radio would
>> have done, had such been available.
>> R
>>
>> *From:* arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> *On
>> Behalf Of *Dennis Monticelli
>> *Sent:* Tuesday, April 4, 2023 10:38 PM
>> *To:* hwhall at compuserve.com
>> *Cc:* arc5 at mailman.qth.net
>> *Subject:* Re: [ARC5] BC-453-B Power Supply
>>
>> If you elect to not restuff the cap pots, it is easy to re-cap the set.
>> Install a solder lug using the threaded stud that mounts the pot.  That's
>> your ground.  Then it's typically three small caps (most are 0.05) from the
>> lug directly to the stiff wires you cut from the cap pot terminals.
>>
>> Yes, lower voltage than 250V works fairly well.  My experience is to keep
>> it at least 60V for decent gain and sure starting of the BFO.  The lower in
>> voltage you go the more you're going to want to short out one of the R's in
>> the screen voltage divider to keep the gain from decreasing too much.
>>
>> FYI.  My 453B pulls only10mA at 60V with new caps.  I've run it off a
>> stack of 9V batteries and they last a long time.
>>
>> Dennis AE6C
>>
>> On Tue, Apr 4, 2023 at 6:57 PM <hwhall at compuserve.com> wrote:
>>
>> Those Command Set receivers had a B+ dynamotor that supplied 250v at 60
>> mA. Many people operate the sets on lower B+.  If these little round
>> "flower pot" caps are the ones you're looking at, they aren't soldered
>> shut.  The edges are bent over the mica insulators.  Most people either
>> trash the old cap pots or carefully remove, cut them open, restuff & either
>> glue or solder the cut edge.
>>
>> Wayne
>> WB4OGM
>> -----Original Message-----
>> From: Glenn Little WB4UIV <glennmaillist at bellsouth.net>
>> To: arc5 at mailman.qth.net
>> Sent: Tue, Apr 4, 2023 7:45 pm
>> Subject: [ARC5] BC-453-B Power Supply
>> I have a BC-453-B that has minimal hacks.
>> At a recent hamfest I found a ARN-30 solid state dynamotor replacement.
>> This power supply will properly mate with the receiver.
>> Should this supply power the receiver properly?
>> Some of the can capacitors along the side of the receiver are leaking.
>> It looks like these have a soldered on top.
>> Is it a lot of trouble to rebuild these capacitors?
>>
>> Thanks
>> 73
>> Glenn
>> WB4UIV
>>
>> --
>>
>> -----------------------------------------------------------------------
>>
>> Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
>>
>> Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
>>
>> QTH:  Goose Creek, SC USA (EM92xx)  USSVI, FRA, NRA-LM    ARRL TAPR
>>
>> "It is not the class of license that the Amateur holds but the class
>>
>> of the Amateur that holds the license"
>>
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