Homebrew PCBs

On Monday 25 July 2005 08:39 pm, hjf2k2 wrote:
> > am changing my voltmeter design a 3rd time and going with the LM3914.  I
> > have yet to figure out how I can use it for an ammeter, but that's
>
> another
>
> > story.
>
> shunt. http://www.tpub.com/content/neets/14175/css/14175_33.htm
>
> That's how those cheap digital testers work, if you crack one open
> you'll find a big piece of wire (1,5mm diameter, about 1 inch long),
> that's the shunt resistor.
>
> BTW, you know about the ICL7107 right? It's a 40-pin IC with all you
> need to drive a 3 1/2 digit 7-seg led display, exactly like cheap
> testers. www.intersil.com, order free samples with free shipping!

Yeah,  but the Maxim replacement allows fewer external components...