Electrical Induction
I want to use the Cyton + Daisy for an animal study in cardiac arrest. I need to induce an arrhythmia using transcutaneous induction with needles under the skin connected to three 9V batteries in series. The needles will be in close proximity to the electrodes connected to the board. If the board isn't powered at that time, is there a risk that I could damage it with this current? I could plug the electrodes only after the electrical induction, but the protocol is pretty time-sensitive, so this is going to add another level of complexity.
Thank you for your help.
Comments
Hi Lawrence,
Your 9V batteries are likely to be a little over that if fresh. So, 30+ volts. I would not risk it. The inputs of the ADS1299 chip should not go beyond the plus and minus rails of the regulated power supply, which is 2.5 volts (plus and minus). If you go beyond these values, especially 30 plus volts, which is huge, it could cause internal overloads in various components even beyond the ADS1299.
https://en.wikipedia.org/wiki/Nine-volt_battery#:~:text=Actual voltage measures
https://docs.openbci.com/Cyton/CytonSpecs/
Regarding your time sensitivity, another option you have is to use some type of multipole dual throw switch to short the inputs during the induction period.
https://www.google.com/search?q=8+pole+double+throw+switch
William
Actually you don't need 'double throw', 'single throw' is sufficient.
https://www.google.com/search?q=8+pole+single+throw+switch
The 'poles' determine how many separate inputs are connected. The 'throw' is how many control positions the switch has. Single throw usually means the inputs are either connected or disconnected from the outputs. Double throw means the inputs can select two alternate outputs. So that is overkill for your application.
This switch seems to be mislabeled. From the photo it appears to be 12 pole, double throw.
https://www.amazon.com/uxcell-Self-Locking-Button-Switch-Position/dp/B07P7CS68M