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Post as a guest Name. To be clear, removing the capacitor doesn’t light up the LEDs all at once. You might want to edit to explain your answer a bit more. Can someone explain what the reversed capacitor an684 doing here?

Capacitor with polarity can be used ac couple or blocking. Fadecomic 2 6.

AN Datasheet pdf – 5-Dot LED Driver Circuit – Panasonic

By “low side”, you’re referring to the inverting inputs of the comparators. I’m not following you. Pin 8 accepts a positive input voltage.

As displayed, the LEDs go from fully off to fully on over roughly the entire turn range of the potentiometer. 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.

I’m not reading it that way. Indeed, it must in order for any of the LEDs to turn on! Setting 7 higher than ground biases the low side of the comparators, allowing them to turn on with a lower output from the amp.

Passing Vin through a reverse capacitor seems to be potentially more prone to failure. Sign up using Facebook.

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: 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 ddatasheet.


There is also no discharge path with your arrangement. Sign up or log in Sign up using Google. Reverse biased capacitor on IC input pin Ask Question. 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.

That’s clear, because the input in my test circuit is DC.

(PDF) AN6884 Datasheet download

It appears to be reversed. Your description doesn’t agree with that in the datasheet. Per AN’d datasheetPin 8 is the signal input pin, and it’s the internal Op amp’s positive input. The diode will mess up sn6884 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. 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. If I “correct” the orientation, the circuit does not work at all.

You should fix the capitalisation of sentences and electrical units ‘F’ for farad to improve legibility and credibility. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Most people use “low” to refer to either a lower voltage, or a lower position on the diagram.

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

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. So it determines the DC bias of the block capacitor’s polarity. This circuit will light the LEDs as the input voltage on pin 8 increases relative to pin 7. However, if that’s the case, I can’t explain why reversing the capacitor doesn’t work, unless the dztasheet polarity of the capacitor is backwards from what you think it is.


How does doing anything to pin 7 or pin 8 affect that? Very confusing terminology, since the inverting input can have a higher voltage than the noninverting input. It just na6884 the range of turn over which the potentiometer works. Sign up using Email and Password. That is to say that datashset LEDs all come on at a much smaller turn of the potentiometer. If I remove the 2.

Have you tried a non-polarized capacitor e. I will be certain to use them here from now on. That means dataseet is a small current flow out from the pin. Right, I get that pin 7 is the output of the amp, but it’s part of the datasehet feedback loop on the amp.

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. Vref is the high side of the 5 LED comparators in the datasheet 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. It’s dataeheet DC bias determine the polarity.

This makes sense, but why not a diode?