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Your description doesn’t agree with that in the datasheet. It just shortens the range of turn over which the potentiometer works. That is to say that the LEDs all come on at a much smaller turn of the potentiometer.

AN 데이터시트(PDF) – Panasonic Semiconductor

Can someone explain what the reversed capacitor is doing here? Pin 8 accepts a positive input voltage. As displayed, the LEDs go from fully off to fully on over roughly the entire turn dtaasheet of the potentiometer. So it determines the DC bias of the block capacitor’s polarity. Indeed, it must in order for any of the LEDs to turn on!

(PDF) AN6884 Datasheet download

Reverse biased capacitor on IC input pin Ask Question. Sign up datasueet log in Sign up using Google. Very confusing terminology, since the inverting input can have a higher voltage than the noninverting input.


Capacitor with polarity can be used ac couple or blocking. Have you tried a non-polarized capacitor e. Email Required, but never shown. Fadecomic 2 6.

Right, I get that pin 7 is the output of the amp, but it’s part of the negative feedback loop on the amp. It sounds like you’re trying to drive this circuit with a signal that includes a considerable DC bias, which explains why all of the LEDs light up right away when you remove short out the capacitor.

AN Datasheet PDF –

This circuit will light the LEDs as the input voltage on pin 8 increases relative to pin 7. By “low side”, you’re referring zn6884 the inverting inputs of the comparators.

Post as a guest Name. Most people use “low” to refer to either a lower voltage, or a lower position on the diagram. That means there is a small current flow out from the pin. If I remove the 2.

I know the correct names, but I conversely find “inverting” and “noninverting” confusing when dealing with comparators, since those terms make more sense when dealing with op-amps. Sign up using Email and Password. Home Questions Tags Users Unanswered. You might want to edit to explain your answer a bit more. There’s still a much shorter range over which a varying number of LEDs come on.


The potentiometer daatasheet clear, but the 2. Passing Vin through a reverse capacitor seems to be potentially more prone to failure. Per AN’d datasheet.

I’m not reading it that way. Pin 8 is the signal input pin, and it’s the internal Op amp’s ab6884 input. I am looking at 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: Pin datashwet is the output of the internal amplifier, and pin 8 is its input, designed to accept a low-level AC input 57 mV for a 0-dB indication.

How does doing anything to pin 7 or pin 8 affect that? By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policy datashewt, and that your continued use of the website is subject to these policies.