I'm concerned that there is so much connect your EMG,ECG,EEG electrodes to your amplifer and your all set to make measurrmets, control mouse pointers and soforth. What people forget is that when you connect to a mains powered item there is a risk of shock or injury. So your arduino or other widget that's powered from a wall brick, or a scope or a PC presents a real problem.
Its generally unwise to use anthing but battery power. Unless you understand and can control the current leakage paths your kit you may be in for a shock. The Leakage path is mostly via capacitance in power supply transformers and it makes no difference if its linear PSU or a SMPS.
I hope you wouln't deliberately connect yourself to the live mains through a small capacitor- so don't do it by mistake!
Its also important to limit DC currents that can flow though electrodes. An overloaded or damged ic input will provide plenty of current. even a few uA flowing through a skin electrodes can cause electrolytic burns. Not (usually) fatal, but very sore indeed.
Finally, don't test your thing out on those you love or hate. Just yourself, at your risk!
Its generally unwise to use anthing but battery power. Unless you understand and can control the current leakage paths your kit you may be in for a shock. The Leakage path is mostly via capacitance in power supply transformers and it makes no difference if its linear PSU or a SMPS.
I hope you wouln't deliberately connect yourself to the live mains through a small capacitor- so don't do it by mistake!
Its also important to limit DC currents that can flow though electrodes. An overloaded or damged ic input will provide plenty of current. even a few uA flowing through a skin electrodes can cause electrolytic burns. Not (usually) fatal, but very sore indeed.
Finally, don't test your thing out on those you love or hate. Just yourself, at your risk!