Cranial Electrotherapy StimulatorCircuit

Posted on Feb 5, 2014

Owing to the recent launching in Europe of Cranial Electrotherapy Stimulation (CES) portable sets, we have been `Electronically Stimulated` in designing a similar circuit for the sake of hobbyists. CES is the most popular technique for electrically boosting brain power, and has long been prescribed by doctors, mainly in the USA, for therapeutic re

Cranial Electrotherapy StimulatorCircuit
Click here to download the full size of the above Circuit.

asons, including the treatment of anxiety, depression, insomnia, and chemical dependency. CES units generate an adjustable current (80 to 600 microAmperes) that flows through clips placed on the earlobes. 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. Some people report that this kind of minute specialized electrical impulses contributes to achieve a relaxed state that leaves the mind alert. Obviously we can`t claim or prove any therapeutic effectiveness for this device, but if you are interested in trying it, the circuit is so cheap and so simple to build that an attempt can be made with quite no harm. IC1 forms a narrow pulse, 2. 5Hz oscillator feeding IC2. This chip generates the various timings for the output pulses. Output is taken at pins 2 & 3 to easily obtain negative going pulses also. Current output is limited to 600 µA by R2 and can be regulated from 80 to 600 µA by means of R3. The LED flashes every 2 seconds signaling proper operation and can also be used for setting purposes. It can be omitted together with R4, greatly increasing battery life. In this case use a frequency meter to read 2. 5Hz at pin 3 of IC1, or an oscilloscope to read 400msec pulses at pins 2, 3 or 10, adjusting the added trimmer. Ultra-simple earclips can be made using a thin...

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