Anyone have any updates about their experiences using cranial electrotherapy stimulation?
It has been nearly 10 years since I built the very simple version of a CES which I mentioned in a previous post, but I still have not acquired ear clips for a regular real-world test! However, for anyone else considering making one, I thought I would at least post some basic evidence that it does technically work.
Previous website claim made about the output:
"The waveform of this device is a 400 milliseconds positive pulse followed by a negative one of the same duration, then a pause of 1.2 seconds. The main frequency is 0.5 Hz, i.e. a double pulse every 2 seconds."
Is that true for mine? Here are some captured waveforms, one at 500ms per division, and a close up at 200ms per division. I did not bother to take further measurements yet:
Roughly true, but oh dear, looks more like 360 milliseconds positive swing, 360 milliseconds negative swing, with only 1.04s dead time, so a frequency of about 0.568 Hz. Oh well, might still be OK to use anyway. I did not have access to an oscilloscope when I built it, so perhaps some minor component value changes (e.g. R1 or C1 next to the 555 timer IC) would achieve the correct proportions. Might play around with the value of R1 later and scope the 555's output.