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AN Datasheet(PDF) – Panasonic Semiconductor

Pin 8 is the signal input pin, and it’s the internal Op amp’s positive input. Very confusing terminology, since the inverting input can have a higher voltage than the noninverting input.

Setting 7 higher than ground biases the low side of the comparators, allowing them to turn on with a lower output from the amp.

As displayed, the LEDs go from fully off to fully on over roughly the entire datashwet range of the potentiometer. I’m not following you. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

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That is to say that the LEDs all come on at a much smaller turn of the potentiometer. You should fix the capitalisation of sentences and electrical units ‘F’ for farad to improve legibility and credibility. 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.


Have you tried a non-polarized capacitor e. If I “correct” the orientation, the circuit does not work at all. Post as a guest Name.

This makes sense, but why not a diode? How does doing anything to pin 7 or pin 8 affect that?

(PDF) AN Datasheet PDF Download – 5-Dot LED Driver Circuit

Passing Vin through a reverse capacitor seems to be potentially more prone to failure. Fadecomic 2 6.

It’s the DC bias determine the polarity. 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: Datahseet diode will mess up the response of the chip due to its forward voltage drop.

There’s still a much shorter range over which a varying number of LEDs come on. Sign up using Facebook. 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 datasheey capacitor.

However, if that’s the case, I can’t explain why reversing the capacitor a6n884 work, unless the actual polarity of the capacitor is backwards from what you think it is. That’s clear, because the input in my test circuit is DC.

AN6884 Datasheet PDF

Email Required, but never shown. There is also no discharge path with your arrangement. Right, I get that pin 7 is the datashdet of the amp, but it’s part of the negative feedback loop on the amp. Per AN’d datasheetPin 8 is the signal input pin, and it’s the internal Op amp’s positive input.


Capacitor with polarity can be used ac couple or blocking. Pin 8 accepts a positive input voltage. Indeed, it must in order for any of the LEDs to turn on! Placing it at a higher voltage within the datasheet’s max specified V will both lower the amplification and raise the lower rail of the comparators in the block diagram.

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. I’m not reading it that way. Per AN’d datasheet. Most people use “low” to refer to either a lower qn6884, or a lower position on the diagram. So it determines the DC bias of the block capacitor’s polarity. Sign up using Email and Password. Vref is the high side of the 5 LED comparators in the datasheet block diagram.

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