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" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
<[email protected]>
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" <[EMAIL PROTECTED]>
> To: "Discussion of AM Radio in the Amateur Service"
> <[email protected]>
> 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 <[EMAIL PROTECTED]>
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" <[EMAIL PROTECTED]>
>> > To: "Discussion of AM Radio in the Amateur Service"
>> > <[email protected]>
>> >
>> > 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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>
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