Pictures, for the most part, of schematics I've drawn, using ExpressPCB, free software. There is little or no text. A few may have been drawn by others. Those from Quantsuff (quantsuff.com) have a QS in the name. I've received permission from QS to use them. Solid State Systems is a name I used many years ago.
Notice that the bias current for Q1 must go through the "input", which may be the body of the patient. The current will be very low, a microamp or less.
Instead of 2N2484, use a high gain NPN such as MPSA18 or a BC550C selected for high current gain, 600 or more.
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