RE: [TCML] measuring frequencies and high voltages

["Jim Mora" <wavetuner@xxxxxxxxx>]

Hi Scott,

I need to take issue with the speaker freq response test range post. To get
down below 100hz, a woofer will be likely be required. Most speakers roll
off at 5-10khz to almost nothing which requires a tweeter to get up to
18-20khz or a full range speaker cabinet.

Nothing is more illusive that testing with equipment that is blind to the
target under test!

Regards,
Jim Mora

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of BunnyKiller
Sent: Wednesday, October 14, 2009 3:23 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] measuring frequencies and high voltages

Hey Rhys...

If you built the pulse generator correctly... then it should be creating 
pulses...  the eye can detect up to about 50 Hz light pulses ( altho 
some can see flickering at 72 Hz...) an option is to attach a speaker to 
a low voltage output ( about 3-40 volts depending on speaker size... but 
remember the speaker has on avg. an 8 ohm resistance  Ive seen some as 
low as 4 ohms)  this should be good to about 18-20 KHz or so ( if your 
hearing is good to excellent)...

As far as measuring hi voltages with a standard meter, this takes some 
engineering...  (or purchasing a hi volt meter lead) add an additional 
100 meg resistor to the lead and multiply the voltage on the meter by 
approximately 100...  ( this works for MY meter... not a gaurintee that 
it works far all meters...  depends on what value of resistor is 
incorporated in the meter originally).

BTW... from reading the thread of your project,  seems like you should 
have gone towards a laser flash tube type of design...   Check out SAMS 
LASER SITE  for mega amounts of info on schematic, info, and everything 
you want to know about flash tubes, diodes, what ever ...  the site is 
FULL of all sorts of photo/optic/electronic info...

Scot D



Rhys Sage wrote:

>I've built my DC pulse generator. I have a nice green LED coming off it. My
big question now is, how do I know if it is a pulsed or constant signal? I
don't have an oscilloscope and only a very basic meter.
>
>Similarly, how do I measure high voltages when my meter only reaches 500v?
>
>
>
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