[AMRadio] Cap Substitution


Bob Macklin macklinbob at msn.com
Fri Feb 15 10:11:51 EST 2008


I was about to make a similar suggestion.

But if the transformer has a 24V secondary jut use a FW diode bridge.

Bob Macklin
K5MYJ
Seattle, Wa,
"Real Radios Glow in the Dark"
----- Original Message -----
From: "jeremy-ca" <km1h at jeremy.mv.com>
To: "Discussion of AM Radio in the Amateur Service"
<amradio at mailman.qth.net>
Sent: Friday, February 15, 2008 7:03 AM
Subject: Re: [AMRadio] Cap Substitution


> 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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