EMS signals production out of 1mhz signal

[udir]

Hi All,
I need to use a 1Mhz sine signal and produce from it a low frequency square wave (around 12HZ) for use in EMS (Electro muscle stimulation).what I ve done so far is to modulate the 1mhz signal into 12.5HZ frequency packets (the 1Mhz signal is running in each packet).Since its basically a sine wave the avg energy is equal to 0 and thats why there is no muscle contraction.I thought of using a simple full bridge rectifier to flatten the 1mhz signal creating a square wave resemble signal (Each packet).
My q is if it sounds logical to you an whether you think this full bridge would help me out.
TNX
Udi

 

[BradtheRad]

Is this similar to a store-bought device I once saw...

where you stick 2 pads to your skin,
with a wire going to each pad,
and a voltage spike goes to them several times a second,
causing your underlying muscles to contract and relax several times a second? A pleasant sensation once you get used to it.

A full-wave diode bridge will turn 1 MHz sines into 2 MHz mountains.

You can also try a single diode, if you want 1 MHz mountains with a gap in between.

Screenshot:

 

[chuckey]

I do not understand where the 1MHZ comes from or where it is used. I would have thought that the 12.5HZ would have actuated muscles so the 1 MHZ if used for detecting the presence of the 12.5HZ, could it not just be added to it. So sit you 1MHZ on a DC level and use that to modulate the 12.5HZ, so you have a 12.5 HZ square wave with a 1 MHZ sine wave sitting on top of the peaks.
Frank