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  • Build a Human Enhancement Device (Basic tDCS Supply)

    I like your electrode setup, it seems better than the one I was originally suggesting, so I've added it to the body of the article!

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  • Build a Human Enhancement Device (Basic tDCS Supply)

    Anode +Cathode -

    E1 anode, E2 cathode

    Thank you for the feedback; the circuit will drift somewhat with temperature mostly due to the Vf of the three diodes; I have designed a revised circuit (with low battery indication, and only one additional part) using an integrated voltage reference ZR40402F50TA.https://github.com/quicksilv3rflash/SMD_tDCSThe integrated regulator will be more temperature stable, though the NPN series-pass transistor will still see its VBE fall a bit as temperature rises, which will cause output current to rise slightly.Don't trust your simulator for those output current values, breadboard the circuit! I've built about 50 copies of that circuit and they've all measured between 1.97mA and 2.02mA with the parts I've got on hand. Current drifts downwards by about 20uA within the 10 minutes after turning on...see more »Thank you for the feedback; the circuit will drift somewhat with temperature mostly due to the Vf of the three diodes; I have designed a revised circuit (with low battery indication, and only one additional part) using an integrated voltage reference ZR40402F50TA.https://github.com/quicksilv3rflash/SMD_tDCSThe integrated regulator will be more temperature stable, though the NPN series-pass transistor will still see its VBE fall a bit as temperature rises, which will cause output current to rise slightly.Don't trust your simulator for those output current values, breadboard the circuit! I've built about 50 copies of that circuit and they've all measured between 1.97mA and 2.02mA with the parts I've got on hand. Current drifts downwards by about 20uA within the 10 minutes after turning on, though due to the diodes warming up and losing Vf.Also, for some reason your simulator seems to think LEDs need more current to visibly glow than they require in real life.

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  • Build a Human Enhancement Device (Basic tDCS Supply)

    Glad to be of service! The spoon/sponge electrode setup is exceptional. If you use a 1000uF (1mF) capacitor across the diodes, then the time constant will be 12 seconds, so it will ramp up to 63% in the first 12 seconds and then to 86% after the next 12 seconds, being within 1% of the full output current within about a minute. Note that this capacitor only needs to be rated to withstand about 5 volts, since the diodes will clamp the voltage across it to 2.1V maximum.

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  • quicksilv3rflash posted an instructable LIFETIMER5 months ago