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By “low side”, you’re referring to the inverting inputs of the comparators.

AN6884 Datasheet

You might want to edit dataasheet explain your answer a bit more. The LED pins connect to the negative side of the LEDs, and the pins go low when the output of the internal amp goes above Vref dropped by voltage dividing resistors at each comparator.

However, if that’s the case, I can’t explain xn6884 reversing the capacitor doesn’t work, unless the actual polarity of the capacitor is backwards from what you think it is.

Can someone explain what the reversed capacitor is doing here? There’s still a much shorter range over which a varying number of LEDs come on. Per AN’d datasheetPin 8 is the signal input pin, and it’s the internal Op amp’s positive input. The potentiometer is clear, but the 2. This circuit will light the LEDs as the input voltage on pin 8 increases relative to pin 7.


I know the correct names, but I conversely find “inverting” and “noninverting” confusing when dealing with comparators, since those terms make more datsaheet when dealing with op-amps. Passing Vin through a reverse capacitor seems to be potentially more prone to failure. As displayed, the LEDs go from fully off to fully on over roughly the entire turn range of the potentiometer. Indeed, it must in order for any of the LEDs to turn on!

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(PDF) AN6884 Datasheet download

Sign up using Email and Password. If I “correct” the orientation, the circuit does not work at all. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policy datashdet, and our Terms of Service.

Fadecomic 2 6. So it determines the DC bias of the block capacitor’s polarity. The diode will mess up the response of the chip due to its forward voltage drop.

AN Datasheet(PDF) – Panasonic Semiconductor

Pin 7 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. Your description doesn’t agree with that in the datasheet. Very confusing terminology, since the inverting input can have a higher voltage than the noninverting input. That means there is a small current flow out from the pin.


If I remove the 2. This makes sense, but why not a diode?

AN 데이터시트(PDF) – Panasonic Semiconductor

Pin 8 accepts a positive input voltage. Pin 8 is the signal input pin, and it’s the internal Op amp’s positive input. Per AN’d datasheet. That’s clear, because the input in my test circuit is DC.

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 Satasheet light up right away when you remove short out the capacitor.

I will be certain to use them here from now on. Sign up or log in Sign up using Google.

Email Required, but never shown. It just shortens the range of turn over which the potentiometer works.