Hey everyone,
In my explorations with musicians about pulse generators, one has informed me that he has a digital synthesizer that will create all kinds of square/sine/triangle waves, whatever, at almost any pitch/tone/frequency. I don't completely understand the effects of pulse width, frequency, and mark/space on the tone or pitch of a signal, but I was wondering, is there any way to amplify the output of a musical synthesizer to be able to drive a MOSFET or trench fet with it?
Thanks!
Joe
Mosfets are basically on/off 'switches' and will not output the special waveforms you feed. However, a few hi-powered class-D audio amplifiers use them.
You might be able to feed the synthesizer output to a car 'Boom Box" high power amplifier. You will need to modify it to amplify the higher frequencies. For higher output voltage, you will need wide frequency range audio transformer.
the main prob with digital synthesis from a musical instrument is that frequencies are limited to the audible hearing range 20Hz to 20KHz and even if the ranges are adjustable higher it is still just a digital signal trying to simulate an analog signal.
nature is analog, best bet is to look into old analog synth circuits as a starting point. Same for solid state amplifier circuits...
This is a concept I am thinking of experimenting with in the near future , I am a guitarist and have a pretty expensive effect processor that does all kinds of different frequency's....From sweep, to phrase , flange , square wave , tri and so on ,I hook my guitar to some plates a few weeks ago and got some very interesting results not big, got some bubbles ever time I hit a cord and got different results with different effects....I am planning on getting a 2000 - 4000 watt power amplifier in the near future and going to hook all my equipment up to a 16 plate dry cell and she what she will do...Its just something I am wanting to try a little deeper
sweet man, I'm still working on tank circuit resonance... I think the acoustic resonance of the plates is called cavitation, it enhances the dissociation. I too have about 30 plates, 12" x 6", 304 grade stainless. What are yours?
There are quite nice DDS Chips from Analog Devices,
for example AD9833 - as very basic / Cheap device.
This stuff works up to 20MHz for sine/triangle.
Its also possible to use multiple DDS up to
some 100reds of MHz.
For similar experiments - I wanted to build
such synthesizer - even capable to work in different
time domains (means can be tuned to even irrational
beat frequencies) with multiple tuned TCXCOs.
The original plan was to build a water reactor with
multiple piezo tabs to investigate dissociation a´la
Keely.
What I figured out so far is that I need a carries frequency
about 2Mhz...
The pain is that I need an Amp with a Bandwith of some
MHz and some hundred volts.
If you can give me an Idea of the signals/ power you need -
maybe I can build something with "dual use";...
rgds.
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But their ,different, technologies also serve for "music instruments"
S
CdL
Quote from: Farlander on October 19, 2008, 06:43:53 PM
I think the acoustic resonance of the plates is called cavitation, it enhances the dissociation.
As far as I know - cavitation is the effect that water switches from liquid to gaseous state
if you exceed certain pressure.
This happens for example if you drive a water propeller above rated rpms.
The cavitation bubbles are quite aggressive and crack the edges of the propeller.
In case of cavitation - there would only be steam bubbles, no hho.
What I´ve seen so far from AC electrolysis - with different frequencies - that there are
only bubbles if there is an (at least intermittend) DC compound.
Things will start to be interesting using to almost identical frequencies with slow beat
frequencies.
With a heavily distorted / fuzzed / compressed guitar sound - you should be able
to generate such "intermittend DC".
I think that cavitation plays some role in the Meyer tube setups - not as direct hho
generating effect -but thru means of effect to ease dissociation.
rgds.
Quote from: lancaIV on October 19, 2008, 07:11:25 PM
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mhh - would think that realtime compensation is somhow state of the art.
Everyone does it - and it´s quite difficult verify that you use certain
transformation table.
Link is broken...
Quotehttp://www.edn.com/article/CA236418.html
I am trying to build a 500khz square wave generator... I think square wave is key to the step charging effect, or for switching a mosfet.
Quotefor example AD9833 - as very basic / Cheap device.
This stuff works up to 20MHz for sine/triangle
The problem with sine and triangle is you need a comparator or op-amp to turn the signal into a square wave using a reference voltage. They are slow
Here is the wave I'm trying to emulate... it needs to be solid state, and analog, and eventually work with a feedback mechanism to determine resonant frequency. Regarding resonance-- what is the difference between a tone and a pitch? You can clearly hear two different sounds in the video when the signal pulse width and frequency are adjusted. I think the gating, (pulse "packet" width) affects the acoustic resonance of the tubes and should be adjustable within the audio frequency range. The shorter "pulse" is most likely the resonant frequency of the LC circuit, and should be mhz or whatever adjustable.
hi guys
i am also working with a resonant cell.
the cell i am building uses 42.8khz with a second frequency injected in the plates.
the 42.8khz frequency is induced electromagnetically with the second frequency induced by pulsing dc voltage into the plates.
Quote from: Hydro-Cell on November 17, 2008, 02:54:32 PM
hi guys
i am also working with a resonant cell.
the cell i am building uses 42.8khz with a second frequency injected in the plates.
the 42.8khz frequency is induced electromagnetically with the second frequency induced by pulsing dc voltage into the plates.
You apply a 42.8kHz periodic magnetic field ?
Wavelength for electromagnetic coupling would be too big !???
Quote from: fritz on November 17, 2008, 06:46:50 PM
You apply a 42.8kHz periodic magnetic field ?
Wavelength for electromagnetic coupling would be too big !???
not sure what your getting at??
i am going to assume tha you are refering to the wavelength being too big so you cant get a coil to emmit electromagnetic waves..
the wavelength for 42.8khz is roughly 7000metres peak to peak. so we halve this and get 3500 metres, this is the required length for a half wave dipole
a dipole is made up of 2 sides so we halve this again giving 1500 metres per side.
wind this 1500 metres of wire around a 36cm core to give 1:1 power ratio do this for both sides of the dipole.
the dipole after doing swr on it will be set up to both transmit and recieve 42.8khz
the thing with using radio waves or electromagnetic waves is that the power in is almost that of the power out as long as everything is mached up correctly.
the other thing which is what i am banking on is that when these waves are emmited everything they pass through will vibrate/resonate at this frequency, this will include the water molecules and the plates within the water. the power i plan to put into this coil is 700watts. the waves will be contained within the cell using a farady cage.
at the same time as this is going on 10.8khz frequency will be put directly into the plates. this will cause a mixture of wavelengths within the cells.