Any one knows how to make an ossilating-tdcs ?

I have successfully constructed my simple tDCS device and after only 5 days of using it i had a lucid dream that i could attribute to the device but now i have a problem , research shows that you need a oscillating-tDCS device to alter your brain waves along with stimulating the part you wanna stimulate using direct current . (scientists succeeded at inducing lucid dreaming using oscillating tDCS that altered brain waves to 40 hz while stimulating the dlpfc with the o-tDCS device. My device currently only provides a direct current and doesn't have the oscillating capability , does any one here how to modify it to provide frequencies to the current while still providing a direct current that flows from the anode to the cathode , am a med student not an electrical engineer so i don't know how it could be done , any help would be appreciated , and please keep it as simple as possible.

I know very little of engineering, so I'll I can say is 555 timer chip

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Originally Posted by dutchraptor

I know very little of engineering, so I'll I can say is 555 timer chip

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will that preserve the dc current or will it just turn it into an alternating current ?( i want an oscillating direct current rather than a true alternating current.

It should yes, but like I said I know very little on the topic. Perhaps go to Transcranial Direct Current Stimulation there's a few guys on there who might be able to help.

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Originally Posted by dutchraptor

It should yes, but like I said I know very little on the topic. Perhaps go to Transcranial Direct Current Stimulation there's a few guys on there who might be able to help.

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Thanks for your help what you said is correct and the 555 timer chip can produce square waves with positive to negative polarity so it should work , my only problem now is you need an oscillator to measure such frequency and it costs 300 dollars at least to get one, so i would have to depend on my calculations or on self experimentation .

Well you're a med student right. Is there not someone in the engineering department of your university (if you have one) who could help you?

Surely your university has a message board where you could ask for help?