<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1">
<title></title>
</head>
<body>
<br>
<br>
JOddino wrote:<br>
<blockquote type="cite"
cite="mid010b01c2f2fb$0ad46540$d9be1b42@socal.rr.com">
<pre wrap="">I might need to apologize. I keep thinking everyone remembers mechanical tuners. Perhaps you are too young.
</pre>
</blockquote>
I doubt anybody has called John Ferrell too young in a long time. <VBG><br>
<br>
Ron Van Putte<br>
<blockquote type="cite"
cite="mid010b01c2f2fb$0ad46540$d9be1b42@socal.rr.com">
<pre wrap="">
----- Original Message -----
From: "JOddino" <a class="moz-txt-link-rfc2396E" href="mailto:JOddino@socal.rr.com"><JOddino@socal.rr.com></a>
To: <a class="moz-txt-link-rfc2396E" href="mailto:discussion@nsrca.org"><discussion@nsrca.org></a>
Sent: Tuesday, March 25, 2003 9:04 AM
Subject: Re: "Miracle switch" failures
</pre>
<blockquote type="cite">
<pre wrap="">First of all the electronic "switch" is a device used in a linear mode
</pre>
</blockquote>
<pre wrap=""><!---->when
</pre>
<blockquote type="cite">
<pre wrap="">regulating. If the input voltage drops below the set regulated voltage it
will saturate and if it is a good regulator will have an on resitance of
</pre>
</blockquote>
<pre wrap=""><!---->50
</pre>
<blockquote type="cite">
<pre wrap="">milliohms or so. I didn't hear if he checked the input voltage under the
same conditions he measured 4.2 volts on the output. Either the input
voltage was low or the on resistance was high and/or the load current was
too high.
Second, the electronic switch/regulator is not in parallel or tandem with
the mechanical switch. If the mechanical switch fell off the plane you
would not lose power. In fact I don't even have a mechanical switch on my
new plane. I use a safeing plug to turn it off.
The device I use protects itself and I wouldn't know how to make it fail
within its rated operating conditions. You can put a dead short on the
output and not hurt anything. Try that with your mechanical switch but
</pre>
</blockquote>
<pre wrap=""><!---->have
</pre>
<blockquote type="cite">
<pre wrap="">a fire extinguisher handy.
Think about how long the old mechanical tuners on TVs lasted. When was
</pre>
</blockquote>
<pre wrap=""><!---->the
</pre>
<blockquote type="cite">
<pre wrap="">last time you heard of an electronic tuner going bad? I rest my case.
Jim
----- Original Message -----
From: "John Ferrell" <a class="moz-txt-link-rfc2396E" href="mailto:johnferrell@earthlink.net"><johnferrell@earthlink.net></a>
To: <a class="moz-txt-link-rfc2396E" href="mailto:discussion@nsrca.org"><discussion@nsrca.org></a>
Sent: Tuesday, March 25, 2003 6:24 AM
Subject: Re: "Miracle switch" failures
</pre>
<blockquote type="cite">
<pre wrap="">If I understand the failure conditions, the electronic switch was
</pre>
</blockquote>
<pre wrap="">paralleled
</pre>
<blockquote type="cite">
<pre wrap="">with a mechanical switch.
That is not something that would be considered a 'normal' configuration
</pre>
</blockquote>
<pre wrap="">for
</pre>
<blockquote type="cite">
<pre wrap="">the electronic switch.
I refrain from using these devices because I have never had a switch
</pre>
</blockquote>
<pre wrap="">problem
</pre>
<blockquote type="cite">
<pre wrap="">with a Futaba switch.
Most electronic power switching devices that I am aware of are MOSFET
technology.
These devices switch many amps with great reliability, but are extremely
vulnerable to voltage spikes.
The inputs and outputs are protected by internal diodes from these
</pre>
</blockquote>
</blockquote>
<pre wrap=""><!---->spikes.
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">I have been unable to puzzle out if there is an unprotected input-output
junction.
Here is a possible scenario:
The mechanical switch is turned off generating a spike that damages
</pre>
</blockquote>
<pre wrap="">the
</pre>
<blockquote type="cite">
<pre wrap="">elecronic switch in a failure
mode that drags down the receiver voltage feed.
My personal conclusion is that either switch will work as advertised,
</pre>
</blockquote>
</blockquote>
<pre wrap=""><!---->but
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">when used in tandem it is
not a matter of if it will fail but when it will fail.
John Ferrell
6241 Phillippi Rd
Julian NC 27283
Phone: (336)685-9606
Dixie Competition Products
NSRCA 479 AMA 4190 W8CCW
"My Competition is Not My Enemy"
----- Original Message -----
From: <a class="moz-txt-link-rfc2396E" href="mailto:s.vannostrand@kodak.com"><s.vannostrand@kodak.com></a>
To: <a class="moz-txt-link-rfc2396E" href="mailto:discussion@nsrca.org"><discussion@nsrca.org></a>
Sent: Monday, March 24, 2003 1:16 PM
Subject: "Miracle switch" failures
</pre>
<blockquote type="cite">
<pre wrap="">I know there are some vendors and users of those voltage regulators
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap=""><!---->with
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">the built in switch. One mfg calls it the miracle switch. I have
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap=""><!---->one,
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">hooked it up, am using it with no problems so far, but I may be just
</pre>
</blockquote>
<pre wrap="">lucky.
</pre>
<blockquote type="cite">
<pre wrap="">Is there a right/wrong way to hook up the connectors? I have a radio
</pre>
</blockquote>
<pre wrap="">south
</pre>
<blockquote type="cite">
<pre wrap="">one and there are two male connectors (one for the receiver, and one
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap=""><!---->for
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">recharging), and one female (for the battery input). The system works
</pre>
</blockquote>
<pre wrap="">with
</pre>
<blockquote type="cite">
<pre wrap="">either male plugged into the receiver. Based on Wayne's sad story
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap=""><!---->below
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">I'm wondering if maybe only one should be connected to the receiver in
order to maintain voltage when the switch fails.
Anyone know if there is a sure way to tell if you have it hooked up
correctly?
Wayne writes, " I am/was using a MCI Miracle switch that is a
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap=""><!---->regulator
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">and
</pre>
<blockquote type="cite">
<pre wrap="">has fail safe if the mechanical switch contacts fail the switch stays
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap=""><!---->on
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">all the time. I tested the battery and it checked at 6.5v. I
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap=""><!---->checked
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">through the charge port and 6.5v. But when I checked it through the
connector to the receiver it only registered 4.25v just below the
receivers voltage threshold. "
--Lance
=====================================
# To be removed from this list, send a message to
# <a class="moz-txt-link-abbreviated" href="mailto:discussion-request@nsrca.org">discussion-request@nsrca.org</a>
# and put leave discussion on the first line of the body.
#
</pre>
</blockquote>
<pre wrap="">=====================================
# To be removed from this list, send a message to
# <a class="moz-txt-link-abbreviated" href="mailto:discussion-request@nsrca.org">discussion-request@nsrca.org</a>
# and put leave discussion on the first line of the body.
#
</pre>
</blockquote>
<pre wrap="">=====================================
# To be removed from this list, send a message to
# <a class="moz-txt-link-abbreviated" href="mailto:discussion-request@nsrca.org">discussion-request@nsrca.org</a>
# and put leave discussion on the first line of the body.
#
</pre>
</blockquote>
<pre wrap=""><!---->
=====================================
# To be removed from this list, send a message to
# <a class="moz-txt-link-abbreviated" href="mailto:discussion-request@nsrca.org">discussion-request@nsrca.org</a>
# and put leave discussion on the first line of the body.
#
</pre>
</blockquote>
<br>
</body>
</html>