DiY PEMF//advanced setup\\continuously variable pulse frequency by a SOX audio script: 3pps to 32pps 

DiY PEMF setup using LAPTOP, sound card, audio amp, ferrite transformer,
2 NPN transistors, reed relay & some free open source software
SOX SCRIPT USED:
play -V -r 192000 -n synth 90 sine 700+80000 vol -6 db repeat 300
- the repeat command value determines the PEMF treatment time
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NOTE: DO NOT TRY THIS YOURSELF without your DOCTOR's advise and training, and a professional electronic technician looking over and checking the wiring and hardware ! The output from a setup like this can produce dangerous voltages & currents if you set its current/voltage too high on the circuit structure... *also*, FAIL-SAFE safety features must be included, to prevent accidental over current/voltage damage to the equipment or to you...
DO NOT TRY THIS YOURSELF !
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for more examples of building & using setups like this, see playlist:
• DiY build your own Mic...