Q.

What is the diameter of silver electrodes in the amplifier circuit of Johnson et al?

A. 2 mm
B. 4 mm
C. 6 mm
D. 10 mm
Answer» C. 6 mm
Explanation: Johnson et al (1977) designed a miniature amplifier circuit fully encapsulated in epoxy resin with two small silver electrodes of 6 mm diameter, exposed flush with the base of the module. The electrode is attached to the skin using adhesive tape.
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