Frequencies and resonance

[Magluvin]

Farlander
If you have a car audio amplifier, and a 12v source, this will raise your voltage and have some current handling.
You can set the input sensitivity to a point and control all from the pc.
If it needs to be dc out then a bridge rectifier will be needed.

Mags

[ramset]

Well
here is a man that definitely has an opinion on resonance.[Giant Killer]

http://www.denver.net/~paul/

Look about 7/10ths of the way down the page for "Alien scientists"
You tube vid on Tacoma bridge.
Freakin amazing comments and observations![Hutchinson/ Philadelphia  experiment etc.......... ]
Chet
PS
If anyone can paste a "link" of just that Vid I'd appreciate it!
PPS
Farlander nice to see your still at it[HHO]
You too Dankula!

[dankie]

@ Dankie

I believe I've solved the variable frequency problem using a program called Test Tone Generator.  It allows you to choose sine, square, sawtooth, and triangle, up to I think 20khz.

Now I'm trying to figure out how to amplify the voltage of the speaker signal from the stereo.

http://waterfuelcell.org/phpBB2/viewtopic.php?t=1478

Amplifying is easy , driving this peculiar load will not be easy . The Stephen cell is quite awkward , the inductive parts are in range of BIG speakers but theres also the 68 uF there so it seems like a lowpass @ first glance , the WFC itself is conductive and capacitive , very low capacitance tho , usually under 1 nF per cell for distilled water .

Thats why I believe BJT's cant be used , too prone to what is called in the industry as "second breakdown" and "latch-ups" . Inductive loads cause that usually . Theres also gonna have to be a balance of Feedback for the capacitor , wish adds non-linear impedance to the circuit . Bias tuning will also be required .

Thats why I wont use a current controlled resistor but a voltage controlled resistor . But the amplifier version of these are 5 times more expensive and very few companies make those , wonder why ??

[Artic_Knight]

well if the speakers were putting out 5-12 volts perhaps a simple mosfet used to gate a car battery would work? or of course any other source you wanted....  then again perhaps a darlington transistor with the neccessary resistor could be used as well if its going to be sawtooth (so the amps controls gating)

just a thought.

[raburgeson]

Bryce is the man to check out for frequencies. Look at his older stuff first when he was racing boats on hydrogen. There are some references from medical sources too, find them on keely net and rex research.