[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
>> >> ______________________________________________________________
>> >> Our Main Website: http://www.amfone.net
>> >> AMRadio mailing list
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>
>
>
> --
> JT Croteau, N1ESE - Manchester, NH (FN42gx)
> Contest Manager, TARA Skirmish
> ______________________________________________________________
> Our Main Website: http://www.amfone.net
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