[AMRadio] Cap Substitution


jeremy-ca km1h at jeremy.mv.com
Fri Feb 15 10:03:44 EST 2008


Start from scratch and build a tripler using the 1N4007's you mentioned and 
150-220MF caps. Put a diode across the coil after its finished. Also use a 
10-20K bleeder on the PS output, 2-3W is sufficient.

Carl
KM1H

----- Original Message ----- 
From: "JT Croteau" <jt.n1ese at gmail.com>
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>
Sent: Friday, February 15, 2008 9:51 AM
Subject: Re: [AMRadio] Cap Substitution


> Carl: 6.3VAC with three 1N2069's across the relay, 2 facing the
> opposite direction from the other with 150 uF of capacitance.
>
> - JT
>
> On Fri, Feb 15, 2008 at 9:14 AM, jeremy-ca <km1h at jeremy.mv.com> wrote:
>> What is the full AC secondary voltage of the tranny, 6 or 12V? He may 
>> have
>>  been attempting a doubler or tripler circuit and you got it with parts
>>  missing or miswired. If one diode was across the relay coil it is to 
>> prevent
>>  back EMF.  A 24V relay will usually pull in around 16-18V.
>>
>>  Carl
>>  KM1H
>>
>>
>>
>>  ----- Original Message -----
>>  From: "Bob Macklin" <macklinbob at msn.com>
>>  To: "Discussion of AM Radio in the Amateur Service"
>>  <amradio at mailman.qth.net>
>>
>>
>> Sent: Thursday, February 14, 2008 11:05 PM
>>  Subject: Re: [AMRadio] Cap Substitution
>>
>>
>>  > With a single 1N4007 and a capacitor you will have a filtered 1/2wave
>>  > rectifier. It should charge to .9 time the 24V. That should be OK.
>>  >
>>  > You could use 4 1N4007s in a bridge and not use the capacitor.
>>  >
>>  > Bob Macklin
>>  > K5MYJ
>>  > Seattle, Wa,
>>  > "Real Radios Glow in the Dark"
>>  > ----- Original Message -----
>>  > From: "JT Croteau" <jt.n1ese at gmail.com>
>>  > To: "Discussion of AM Radio in the Amateur Service"
>>  > <amradio at mailman.qth.net>
>>  > Sent: Thursday, February 14, 2008 7:55 PM
>>  > Subject: Re: [AMRadio] Cap Substitution
>>  >
>>  >
>>  >> Nope Bob, this guy definitely only had three 1N2069's in parallel -
>>  >> two cathodes to one anode connected directly to a 6.3V tranny.
>>  >>
>>  >> I'm not looking to put it back the way he had it, I'm putting it back
>>  >> the way the schematic shows it with a 1N4007 instead of the 1N91 
>> shown
>>  >> (already have in my junk box) and a filter cap.
>>  >>
>>  >> I'm just trying to understand how he was getting the 24V relay to 
>> work
>>  >> with a 6.3V tranny.
>>  >>
>>  >> - JT
>>  >>
>>  >> On Thu, Feb 14, 2008 at 10:49 PM, Bob Macklin <macklinbob at msn.com> 
>> wrote:
>>  >> > Connecting diodes in parallel does not really effect the current 
>> like
>>  >> >  connecting batteries in parallel. The diode with he lowest forward
>>  >> > drop
>>  > will
>>  >> >  handle most of the current.
>>  >> >
>>  >> >  But if you really had diodes connected with anode to cathode you 
>> don't
>>  > have
>>  >> >  a rectifier. That configuration is used in voltage limiter 
>> circuits.
>>  >> >
>>  >> >  Got to Radio Shack and get some 1N4000 series diodes and use them 
>> for
>>  >> >  rectifiers. You only need one for a 1/2wave rectifier. Or 4 
>> connected
>>  > in a
>>  >> >  bridge for a full wave rectifier.
>>  >> >
>>  >> >  Are you sure the ones you have are not connected in a bridge 
>> circuit.
>>  > There
>>  >> >  would be 4 diodes. And 2 of them would have the cathodes connected
>>  > together.
>>  >> >  The other 2 would have the anodes connected together.
>>  >> >
>>  >> >
>>  >> >  Bob Macklin
>>  >> >  K5MYJ
>>  >> >  Seattle, Wa,
>>  >> >  "Real Radios Glow in the Dark"
>>  >> >
>>  >> > ----- Original Message -----
>>  >> >  From: "JT Croteau" <jt.n1ese at gmail.com>
>>  >> >  To: "Discussion of AM Radio in the Amateur Service"
>>  >> >  <amradio at mailman.qth.net>
>>  >> >
>>  >> > Sent: Thursday, February 14, 2008 7:38 PM
>>  >> >  Subject: Re: [AMRadio] Cap Substitution
>>  >> >
>>  >> >
>>  >> >
>>  >> >
>>  >> > > As a follow up to all this talk..
>>  >> >  >
>>  >> >  > The person who did this mod, was rectifying the power to this 
>> 24V
>>  >> >  > relay with three 1N2069's in parallel with 2 cathodes facing one
>>  >> >  > direction and the other cathode facing the opposite direction.
>>  >> > These
>>  >> >  > were wired to a dedicated 6.3V tranny he also added.  Any idea 
>> why
>>  >> > he
>>  >> >  > would have done this rather than using the 24V tap on the 
>> filament
>>  >> >  > transformer specially there for a 24V relay?  I measure roughly 
>> 26V
>>  > on
>>  >> >  > this tap so I would assume the tranny is fine.
>>  >> >  >
>>  >> >  > --
>>  >> >  > JT Croteau, N1ESE - Manchester, NH (FN42gx)
>>  >> >  > Contest Manager, TARA Skirmish
>>  >> >
>>  >> >
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>>  >> --
>>  >> JT Croteau, N1ESE - Manchester, NH (FN42gx)
>>  >> Contest Manager, TARA Skirmish
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>
> -- 
> JT Croteau, N1ESE - Manchester, NH (FN42gx)
> Contest Manager, TARA Skirmish
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