[ARC5] TCS Transmitter Tip

[Tom Lee]

And I assure you that Dennis knows what he's talking about!

--Tom

-- 
Prof. Thomas H. Lee
Allen Bldg., CIS-205
420 Via Palou Mall
Stanford University
Stanford, CA 94305-4070
http://www-smirc.stanford.edu
650-725-3383 fax

On 11/25/2016 7:46 PM, Dennis Monticelli wrote:
> Neil,
>
> Not a joke.  I assure you that Scott knows what he talking about.  A 
> rise in voltage is necessary for rapid release of the energy in the 
> coil's field, but an uncontrolled high peak can cause problems hence 
> the motivation for a remedy.  The shunt capacitor, whose value needs 
> to be determined for the coil in question, is there to blunt the peak 
> to a safe level.  The loss inherent in the relay coil is sufficient to 
> dampen the tendency toward ringing.
>
> Dennis AE6C
>
> On Fri, Nov 25, 2016 at 2:03 PM, AKLDGUY . <neilb0627 at gmail.com 
> <mailto:neilb0627 at gmail.com>> wrote:
>
>     On Sat, Nov 26, 2016 at 7:46 AM, Scott Robinson <spr at earthlink.net
>     <mailto:spr at earthlink.net>> wrote:
>
>         Another way to speed up the relay is to put a capacitor across
>         the coil. You chose the cap value to limit the peak voltage to
>         something safe, by measurement. I'd start with 0, 1 uF.
>         Smaller cap = higher voltage = faster opening.
>
>         I have done this in commercial products fro 30 years; it works
>         fine.
>
>
>
>     I'm not sure whether you're labouring under a delusion or trying
>     to be funny. The capacitor would slow down the relay.
>
>     73 de Neil ZL1ANM
>
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