[AMRadio] Cap Substitution

Fri Feb 15 09:51:49 EST 2008

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