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To be clear, removing the capacitor doesn’t light up the LEDs all at once. It sounds like you’re trying to drive this circuit with a signal that datashewt a considerable DC bias, which explains why all of the LEDs light up right away when you remove short out the capacitor.
AN6884 Datasheet PDF
As displayed, the LEDs go from fully off to fully on over roughly the entire turn range of the potentiometer. Have you tried a non-polarized capacitor e. That is to say that the LEDs all come on at a much smaller turn of the potentiometer.
I am looking datxsheet the test circuits on the data sheet for the AN VU meter IC, and I cannot understand the connection to pin 8 in the following diagram: How does doing anything to pin 7 or pin 8 affect that? The diode will mess up the response of the chip due to its forward voltage drop. I’m not reading it that way.
There is also no discharge path with your arrangement. Capacitor with polarity can be used ac couple or blocking.
AN 데이터시트(PDF) – Panasonic Semiconductor
Passing Vin through a reverse capacitor seems to be potentially more prone to failure. That means there is a small current flow out from the datashet. Indeed, it must in order for any of the LEDs to turn on! Home Questions Tags Users Unanswered.
You might want to edit to explain your answer a bit more. So it determines the DC bias of the block capacitor’s polarity.
AN Datasheet(PDF) – Panasonic Semiconductor
If I remove the 2. This circuit will light the An684 as the input voltage on pin 8 increases relative to pin 7. Vref is the high side of the 5 LED comparators in the datasheet block diagram. This makes sense, but why not a diode? The potentiometer is clear, but the 2.
an6848 Your description doesn’t agree with that in the datasheet. Sign up using Facebook. Setting 7 higher than ground biases the low side of the comparators, allowing them to turn on with a lower output from the amp. That’s clear, because the input in my test circuit is DC.
However, if that’s the case, I can’t explain why an68884 the capacitor doesn’t work, unless the actual polarity of the capacitor is backwards from what you think it is. Very confusing terminology, since the inverting input can have a higher voltage than the noninverting input. There’s still a much shorter range over which a varying number of LEDs come on.
Reverse biased capacitor on IC input pin Ask Question.