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155-0076-00: Difference between revisions
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This leaves the flip-flop in the stable right-side-active state. | This leaves the flip-flop in the stable right-side-active state. | ||
When pin 13 is allowed to float high, current flows through R45 into the base of Q44. | |||
The collector of Q44 shunts the R43 current away from the base of Q42, | |||
thus cutting off the current in pin 12. | |||
So, in a 485, while the input impedance selector button is pressed, the | |||
input is disconnected from the 50 Ω attenuator. | |||
---- | ---- | ||