[ARC5] TCS Transmitter Tip

[Peter Gottlieb]

I once had a mass produced product design which required tight relay timing on 
release, to other system functions.  The problem was that different brands of 
the PC mount relays has significantly different release times.  The solution was 
a diode-zener combination where the zener was different for each brand.  The 
limit was to keep the inductive kickback under the breakdown of the driver 
transistors used.

May have passed a million of these units produced using that design.

Peter


On 11/25/2016 5:03 PM, AKLDGUY . 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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