<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Excellent circuit protection!<div><br></div><div>In automotive applications I don’t think there is TOO much protection. </div><div><br></div><div>So far the LM2940’s own protection has been sufficient. But the car does not do very many miles each year. So it may simply be too soon to know </div><div><br></div><div>-Tony</div><div><br><div dir="ltr"><blockquote type="cite"><br>On Jun 1, 2022, at 4:18 PM, DAVID MASSEY <dave1massey@cs.com> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
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<div> <font size="3">I go way beyond that. First I use a 1N4004 to protect against negative-going spikes (which car be as high as -80 volts), then I place a 15V Zener or TVS to clamp any positive-going pulses (which can be as high as 120V). Depending on the application I also include a low value resistor or polyfuse to limit the current the TVS needs to sink. Then there is the input filter as you pointed out.</font></div>
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<div><font size="3">This may be a bit of overkill but without the ability to test for optimum and considering I'm only going to build a few (or one) of these things a little overkill is cheap insurance.</font><br>
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<div><font size="4">Dave <br>
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<div style="font-family:arial,helvetica;font-size:10pt;color:black"><font size="2">-----Original Message-----<br>
From: Anthony Rhodes <spamiam@comcast.net><br>
To: triumphs@autox.team.net<br>
Cc: billbrewer59@yahoo.com<br>
Sent: Wed, Jun 1, 2022 1:40 pm<br>
Subject: Re: [TR] TR4/6 Voltage Stabilizer<br>
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<div dir="ltr">I built my own voltage stabilizer.<br>
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<div dir="ltr">At the time, Moss had one that used a diode and a transistor as a form of a crude shunt regulator.<br>
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<div dir="ltr">I used a LM2940–10 automotive low dropout 10 V analog regulator.<br>
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<div dir="ltr">Sense and I have seen photographs of the guts of the newer electronic regulators. It appears they use a single voltage regulator with no other components around it.<br>
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<div dir="ltr">As I recall, These used a through hole TO 220 device with the legs bent over 90 degrees and no heat sinking.<br>
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<div dir="ltr">Not ideal<br>
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<div dir="ltr">All these analog regulators need proper capacitors on the input in output side of the regulator.<br>
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<div dir="ltr">My regulator with the LM 2940–10 has been in use since probably about 2004 with no problems in a TR4A<br>
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<div dir="ltr">I can give further details, schematics, etc. to people if they are interested.<br>
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<div dir="ltr">-Tony<br>
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<div dir="ltr">> On Jun 1, 2022, at 2:01 PM, <a ymailto="mailto:triumphs-request@autox.team.net" href="mailto:triumphs-request@autox.team.net">triumphs-request@autox.team.net</a> wrote:<br>
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<div dir="ltr">> <br>
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<div dir="ltr">> Message: 1<br>
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<div dir="ltr">> Date: Tue, 31 May 2022 19:12:36 -0700<br>
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<div dir="ltr">> From: William Brewer <<a ymailto="mailto:billbrewer59@yahoo.com" href="mailto:billbrewer59@yahoo.com">billbrewer59@yahoo.com</a>><br>
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<div dir="ltr">> To: Triumph List <<a ymailto="mailto:triumphs@autox.team.net" href="mailto:triumphs@autox.team.net">triumphs@autox.team.net</a>><br>
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<div dir="ltr">> Subject: [TR] TR4/6 Voltage Stabilizer<br>
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<div dir="ltr">> Message-ID: <<a ymailto="mailto:4b9c278c-ffbf-4d70-5f30-9e75ceb2468c@yahoo.com" href="mailto:4b9c278c-ffbf-4d70-5f30-9e75ceb2468c@yahoo.com">4b9c278c-ffbf-4d70-5f30-9e75ceb2468c@yahoo.com</a>><br>
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<div dir="ltr">> Content-Type: text/plain; charset="utf-8"; Format="flowed"<br>
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<div dir="ltr">> ???? I have a TR4 temperature gauge in my TR3. The Moss gauge voltage <br>
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<div dir="ltr">> stabilizer only lasted a few thousand miles and the quit outputting the <br>
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<div dir="ltr">> 10 volts. Anybody else having short lifespans on their voltage <br>
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<div dir="ltr">> stabilizers? Are there better ones out there? Moss makes a big deal <br>
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<div dir="ltr">> about "Modern electronics in a vintage style housing". Screw the vintage <br>
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<div dir="ltr">> style housing, I want dependability. Is there an aftermarket one that <br>
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<div dir="ltr">> has a long life?<br>
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<div dir="ltr">** <a ymailto="mailto:triumphs@autox.team.net" href="mailto:triumphs@autox.team.net">triumphs@autox.team.net</a> **<br>
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