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| 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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