Re: DC meters with AC Re: Ignition coil (anti-parallel pairs) array and other questions

• To: tesla-at-pupman-dot-com
• Subject: Re: DC meters with AC Re: Ignition coil (anti-parallel pairs) array and other questions
• From: Terry Fritz <twftesla-at-uswest-dot-net>
• Date: Fri, 23 Jul 1999 11:22:09 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme
• In-Reply-To: <000301bed334$b5e69420$7984007b-at-billygoatgruff>
• References: <4.1.19990718144603.00a0cd90-at-pop.dnvr.uswest-dot-net>

This may be getting old but...

My cheap Radio Shack 0-130 volt AC meter is just a 0-1mA dc meter that has
a small bridge rectifier in it and a resistor.  The recitifer turns the ac
into dc and the resistor limits the current to 1mA full scale when 130VAC
is on the input.  

	Terry



At 10:58 PM 7/19/99 -0700, you wrote:
>I think the original adivce is a bit overstated, I'll offer my suggestions
>
>for both meters - a single diode will work, but I agree, a simple bridge
>rectifier (full wave) is best - that is what you find inside analog VOMs.
>
>for both - I have never seen a filter capacitor, certainly not a few
>microfarads, used with a VOM type meter - if you find you want more damping,
>then a RC circuit will do, but I have only seen this kind of circuit in a VU
>meter, and that's not what you want.  So, no capacitor.
>
>for voltmeter. .. in series with AC side of the rectifier, add a resistor.
>you want to calculate the resistor value so that at the max voltage you wish
>(for full scale on the meter) the current through the resistor equals the
snip...

• Re: Ignition coil (anti-parallel pairs) array and other questions
• From: "Jim Lux" <jimlux-at-jpl.nasa.gov> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)

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