[Elecraft] Transistor for increasing Amp relay speed

Wed Jan 21 14:26:00 2004

So, you need to know how much the relay draws?  Easy.  Turn the amp on.  Unhook the RF input just for grins.  Place your MultiMeter on the current range.  Clip the negative lead to the hot lead of the relay ... usually a RCA phone plug....the center pin.  Hook a alligator clip from the outside of the RCA phono plug to the negative side of a 12 volt power supply.  Turn the amp to Operate (not Standby).  Touch the RED lead from the MultiMeter to the positive side of the 12 volts power supply.  Read the current.  Done.

Or, look in the manual of the amp and it might be documented.

Lee - K0WA

Floyd Sense <[email protected]> wrote:
Well, when I went scrounging in the junk box, I found a few 2N2222s and one
of them worked just fine. I've got it installed and at least it "sounds"
faster. The 2N2222 will handle up to 800ma. of collector current, so I'd
guess most if not all 12V amplifier antenna relays would fall into that
range.

K8AC

----- Original Message ----- 
From: "Hank Kohl K8DD" 
To: "Floyd Sense" ; "Elecraft"

Sent: Wednesday, January 21, 2004 11:55 AM
Subject: Re: [Elecraft] Transistor for increasing Amp relay speed

> The transistor - 2n3904
> The capacitor - a 33 and a 15 ufd in parallel
> The diodes - unmarked, but came out of a bag that said 1n4001
> Floating construction - air cooled
> Pictures available upon request
>
>
> At 1/21/2004 11:12 AM, Floyd Sense wrote:
>
> >Regarding the info from K6XX on increasing the relay speed in amplifiers
> >keyed by the K2 (or any rig for that matter): For those who have done
this
> >already with Ameritron amps, what transistor did you use?
> >
> >73, Floyd - K8AC
> >
> >
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