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From: Robert Baer
X-Mailer: Mozilla 4.75 [en] (Win98; U)
Subject: Re: ESR meter
Date: Mon, 09 Dec 2002 03:35:31 GMT
NNTP-Posting-Date: Sun, 08 Dec 2002 19:35:31 PST
Organization: EarthLink Inc. -- http://www.EarthLink.net
> I have a question about a circuit I am designing. I am building an
> esr meter from a schematic. However, the original schem. doesn't have
> anything to indicate that it is on. I want to install an led that I
> have to a rocker switch. However, the led has a built in resistor. I
> cannot read the bands because it is encased in the plastic. My
> question is what effects will this have on the circuit i.e. too little
> voltage etc.? If so, what can I do to nullify the effects of the
> resistor and led?
LEDs are a *current* operated device; they need some voltage to
support sufficent current to be visible (2-5mA).
If the supply does not have sufficent voltage, then there will be no
I do not see why you have failed to do a simple test using a variable
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