[AMRadio] Cap Substitution

Thu Feb 14 23:05:55 EST 2008

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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