Re: [Healeys] Turn Signals

[john harper via Healeys <healeys@autox.team.net>]

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Jim

I fully agree with your description of an 'old' flasher unit but it was not
a bi-metal strip but a wire under tension that extended and lost its
tension when current went through it and cut off the current, similar to a
bi-metal strip. The wire then cooled and shrank allowing the current to
flow again.

On Sun, 16 Oct 2022 at 04:55, Engl <engl@accesscomm.ca> wrote:

> Hi Jim
>
> You are 100% correct. I should have said lower resistance.
>
> V=3DIR and all that.
>
> Thanks.
>
> Bob England
>
> On Oct 15, 2022, at 8:17 PM, jim <ab7vf@yahoo.com> wrote:
>
> =EF=BB=BF
>
>
> . As the signal light flashers ground through the signal lights, there ha=
s
> to be something to provide a higher resistance than pure LED=E2=80=99s.
>
> >
>
> Are you SURE you mean "higher resistance than pure LED's?
>
> Back in the old days signal flashers were composed of (among other things=
)
> with a "bi-metallic strip".  The purpose of said strip was to bend when
> heated by current flowing through an associated heating element and
> interrupt (flash) the bulbs.  If normal signal bulbs (1157 type) operated
> at nominal 2 amperes current flow, 2 in parallel (front and rear per side=
)
> flow 4 amps would flow through the flasher.   A standard single junction
> LED can "light" with around 20 milliamperes of current.  High current LED=
s
> or LEDs with associated ballast resistors are necessary to flow the MUCH
> higher current needed by the non-electronic flasher
>
> Jim
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<div dir=3D"ltr">Jim<div><br></div><div>I fully agree with your description=
 of an &#39;old&#39; flasher=C2=A0unit but it was not a bi-metal strip but =
a wire under tension that extended and lost its tension when current went t=
hrough it and cut off the current, similar to a bi-metal strip. The wire th=
en cooled and shrank allowing the current to flow again.</div></div><br><di=
v class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, 16 Oc=
t 2022 at 04:55, Engl &lt;<a href=3D"mailto:engl@accesscomm.ca";>engl@access=
comm.ca</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"=
margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-lef=
t:1ex"><div dir=3D"auto">Hi Jim<div><br></div><div>You are 100% correct. I =
should have said lower resistance.=C2=A0</div><div><br></div><div>V=3DIR an=
d all that.=C2=A0</div><div><br></div><div>Thanks.=C2=A0<br><br><div dir=3D=
"ltr">Bob England</div><div dir=3D"ltr"><br><blockquote type=3D"cite">On Oc=
t 15, 2022, at 8:17 PM, jim &lt;<a href=3D"mailto:ab7vf@yahoo.com"; target=
=3D"_blank">ab7vf@yahoo.com</a>&gt; wrote:<br><br></blockquote></div><block=
quote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF<div style=3D"font-family:&qu=
ot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif;font-size:13px"><div></d=
iv>
        <div><br></div><div><br></div>
       =20
        </div><div id=3D"m_2151325790291827148ydp4c5dc9c9yahoo_quoted_63281=
03290">
            <div style=3D"font-family:&quot;Helvetica Neue&quot;,Helvetica,=
Arial,sans-serif;font-size:13px;color:rgb(38,40,42)">. As the signal light =
flashers ground through the signal lights, there has to be something to pro=
vide a higher resistance than pure LED=E2=80=99s.<br><div><div dir=3D"ltr">=
<div id=3D"m_2151325790291827148ydp4c5dc9c9yqtfd72219"><br clear=3D"none"><=
div>&gt; <br></div><div><br></div><div dir=3D"ltr">Are you SURE you mean &q=
uot;higher resistance than pure LED&#39;s?=C2=A0=C2=A0=C2=A0 <br></div><div=
 dir=3D"ltr"><br></div><div dir=3D"ltr">Back in the old days signal flasher=
s were composed of (among other things) with a &quot;bi-metallic strip&quot=
;.=C2=A0 The purpose of said strip was to bend when heated by current flowi=
ng through an associated heating element and interrupt (flash) the bulbs.=
=C2=A0 If normal signal bulbs (1157 type) operated at nominal 2 amperes cur=
rent flow, 2 in parallel (front and rear per side) flow 4 amps would flow t=
hrough the flasher.=C2=A0=C2=A0 A standard single junction LED can &quot;li=
ght&quot; with around 20 milliamperes of current.=C2=A0 High current LEDs o=
r LEDs with associated ballast resistors are necessary to flow the MUCH hig=
her current needed by the non-electronic flasher</div><div dir=3D"ltr"><br>=
</div><div dir=3D"ltr">Jim<br></div>_______________________________________=
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