|[AMRadio] Power Transformer as Mod Transformer (was: Seventy Fiver)|
bcarling at cfl.rr.com
Thu Sep 24 05:50:08 EDT 2009
There is a great article on how to use power transformers like that - as
a mod transformer - available on line for free - by Tim, WA1HLR
I hope it helps you -
LEE, W0VT writes:
> I went to Lowe's this evening and picked up some oak lumber to build up some "Slat Board"
> Transmitters. (They sell oak down to 1/4 inch thick to be used for the "slats". I plan to screw the
> slats to the main oak end panels with brass screws and then stain and polyurethane the wood. I
> plan to build up one chassis as a 6V6 oscillator with pi-net. Another with a 6AG7 with pi-net.
> Then compair the output of the two plus check crystal current on both of them. Then I plan to
> build up another one with a 6AG7 osc and 6L6 amp with pi-net and plug in coils. Then I plan to
> build power supplies for these on slat board chassis and maybe use 5R4 rectifiers as I have some
> of these around here. Then maybe a modulator for the 6AG7/6L6 rig. For a modulation
> transformer I am thinking of trying a 70 volt or 25 volt line transformer or/and a power transformer
> having it's core "restacked" in E and I configuration with a gap between the two. The projects
> won't cost much and I think they will be great looking. I'll use broadcast band variable caps in the
> pi networks. (Duals for loading and singles for the tank circuit.). Maybe use some rigid clear
> plastic tubing over old tube sockets for the plug in coils.
> Lee, w0vt
> ----- Original Message -----
> From: Charlie , W5COV
> To: glowbugs at piobaire.mines.uidaho.edu
> Sent: Wednesday, September 23, 2009 9:04 PM
> Subject: GB> Seventy Fiver
> Group , the topic came up a while back with thoughts of building a 75 meter version
> of the Twoer etc. Heath line .
> Did it fall by the way , because of a lack of interest , or did anyone do any type of
> development on something like this ?
> I am ALWAYS looking for a glowbug project to build , that isn't real complex and
> won't break the bank.
> A transceiver to put on the air would be a nice project . I have a bench overflowing
> with homebrew transmitters , mostly CW .
> Being on a fixed income , I like projects that parts can be readily obtained for at
> cheap prices .
> With my medical problems , I lack the design ability , that I used to have . The
> medications and disease cause a technical medical term called "brain fog" .
> So I depend HEAVILY , almost exclusively ,on other peoples designs .
> So if you know of a simple transceiver design that glows and is AM , please point me
> to it .
> Thanks for allowing me to be a part of the best group I belong to !!
> Charlie , W5COV
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