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Whats the purpose of this transistor?
Whats the purpose of this transistor?
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Old 10th January 2004, 03:01 AM   #1
Hybrid fourdoor is offline Hybrid fourdoor  United States
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Default Whats the purpose of this transistor?

In this article it contains the following schematic, I understand what most everything is doing except that transistor in the middle.
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Old 10th January 2004, 03:10 AM   #2
JOE DIRTŪ is offline JOE DIRTŪ  Canada
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with not even looking at the article or looking at the circuit that close...LOL....shoot me!!!...its a basic switch for the comparator.....so disregard what I just posted

DIRTŪ
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Old 10th January 2004, 04:05 AM   #3
bpetrus is offline bpetrus
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It adds an offset ("85 mV Deadband") between the 2 comparators (pins 5 and 6) since the voltage at pin6 is given by

Vpin6 = Vpin5 + Vbe * (10k / 62k), with Vbe = 0.6
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Old 10th January 2004, 08:31 PM   #4
bpetrus is offline bpetrus
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Oops, the offset should be:

Vpin6 = Vpin5 + Vbe * 10k / (10k + 62k), with Vbe = 0.6

brad
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Old 18th January 2004, 01:42 AM   #5
Hybrid fourdoor is offline Hybrid fourdoor  United States
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Also for this circuit instead of the Crystal digipots, could I use Maxim DS1802's which have the pushbutton control? I happen to have two 1802's allready so that would be easier to use.
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