For personal and system safety, and for optimum product performance, thoroughly understand the contents before using or servicing this product. Deykin a, massaro af, coulston e, drazen jm, and israel e The resistance of each individual resistor is 10 ω, when combined together in series the resistances add up so the total resistance would be 20 ω Each extra resistor makes it harder for the current to flow meaning overall current is reduced. Whilst the ring tone is active and exceeds the zener voltage, the rdn node will be taken low and the output of the schmitt trigger will go high.
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