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>> No.1904681 [View]
File: 43 KB, 1608x1733, circuit.png [View same] [iqdb] [saucenao] [google]
1904681

Okay probably a basic question but here goes. Suppose the following circuit. On the other side of pins 8 & 9 is a sensor, and "To 74LS logic" means just that; the output of this sensor is an input to some TTL logic.

Now, in the schematic (from which this image is derived) there's the 62K resistor. In the hardware revision I have of the same circuit, it's 10K. What might dictate the resistor value here?

Also the 150 ohm resistor is the same between both. What might dictate that resistor's value?

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