Running Light circuit uses a CMOS 555 timer
― A Transcutaneous Electrical Nerve Stimulation (TENS) device is, put bluntly, a machine for giving electric shocks. The author was prescribed such a device on loan by his orthopaedic specialist. The unit has a large number of programmes, of which he used only one. Measuring the signals at the output of the device in this mode revealed damped oscillations at a frequency of approximately 2.5 kHz, with a repetition rate of approximately 100 Hz. ∙ Running Light circuit uses a CMOS 555 timer [...].
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![[Blue prints]*](http://s2.bloggerscdn.com/media/t/14079133/14079133_s_1369116721.jpg)
