I am trying to acquire the components necessary to build this circuit (see attachment) View attachment EKG Circuit 8.pdf. My problem is that there is no partnumber for the switches A, B, C, D. What kind of switch do these represent? Also, there are several resistors with no value written on them - what resistance is needed there?
Thank you, that really helps I also noticed there is a comment saying Wilson 'Terminal Adjustment resistors: R arm = 2.6 Left leg, L arm = 2.6 L leg' I am still not sure how to figure out the value of the Left Leg resistor. There are also two resistors connecting to 2 and 15 of the INA103 with no value, any hints for those?
The resistors are all between low output impedance buffer amps and a high input impedance instrumentation amp. Since they are just used for summing, you can pick values in the 10K range that will give the appropriate ratios. The ratios are more important than the specific values. I would try 10K for LL and 27K for LA and RA for starters. You can figure out 1% resistors that give a closer ratio.