Joule Thief

[jeanna]

Thanks for such a quick answer. Also an easy one. plugging into the mic is great.
I apologize for not rating this vid yet.
firefox isn't recognizing me and I cannot remember my youtube pwd, so I will go on the mac, but later.

Do you think there is voltage  protection against the high spikes of the jtc through the sound card?
I know people do this but we get really high spikes.
(I didn't pay much for this but I would have to pay plenty for another one!)

I am also surprised the frequency was handled.
A sound card has no reason to work above 20khz. My latest is only 12khz, but many are above 50khz.
What was your sec frequency and how do you count it? Do you literally count the squares?

thanks,

jeanna

[dllabarre]

Jeanna no need to open your computer.
It will just plug in were your mic is.
Or It can also be setup for the differant ports in your sound card.

The software I'm using is visual analyzer it's a free program.

Where did you get your sound card oscilloscope probe?
I only see one for sale on ebay.

Thanks
DonL

[xee2]

Where did you get your sound card oscilloscope probe?
I only see one for sale on ebay.

Thanks
DonL

This looks like a good deal. You will need to replace the BNC connector with a mic plug (which I think you can get at Radio Shack).

http://www.google.com/product_url?q=http://www.virtualvillage.com/100mhz-1x-and-10x-oscilloscope-probe/sku001482-001%3Futm_source%3Dgooglebase%26utm_medium%3Dshcomp%26utm_campaign%3D100mhz%25201X%2520and%252010X%2520Oscilloscope%2520Probe&fr=ALIsMzxYMFA0_LOq_xtcDHGkPVgWOf2B9WMGCDa0vJX5ZnTJvdjTsXplw_xXitfBtIuogtvdc6S6XKBi8IpJGxdDzf8gXcfLDK5rQs6B_J4n2S-BXzf_n4gCtKJ8pPMuiJw91MKoSagqEkOK8MF53TmMMEIhH3WuWhUbT2hSi8v7QHKN82-uLrOcJubx40sBXv34xL6SDz81nJbuaD2yEsBmt_Tw32VMjWUdPa3A-lDvbXh8oNRO8j4iNIq5FME2Y-HxZSxiDnHCy6UnPxaG-MAJIe8qtvt09etdIGkHHak6AAAAAAAAAAA&gl=us&hl=en&sa=title

[Thaelin]

     Just be VERY aware that you can easily overdrive the input and burn it out.
Once done, its toast. Already did it on an old laptop just playing around. Best you
can see with it is about 20k as it was meant to do human sounds. The signal gen
will only go that far too.

thay

[slayer007]

@Jeanna

Yes the probes do have some voltage  protection.
There only supposed to let 3v get back to the soundcard.

@Dllabarre

I found this on ebay it was $22 plus shipping.

@Xee2
I don't think that probe will work for the PC.
The probe I'm using is made to work with the pc soundcard.

This is the probe I'm using.
http://cgi.ebay.com/Sound-Card-Oscilloscope-Spectrum-Analyzer-Probe-audio_W0QQitemZ110432407510QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item19b648cfd6&_trksid=p4999.c0.m14