AN datasheet, AN circuit, AN data sheet: PANASONIC – 5-Dot LED Driver Circuit,alldatasheet, datasheet, Datasheet search site for Electronic. AN datasheet, AN pdf, AN data sheet, datasheet, data sheet, pdf, Panasonic, 5-Dot LED Driver Circuit. Description, 5-dot Led Driver Circuit. Company, Panasonic Industrial Company/ Electronic Components. Datasheet, Download AN datasheet. Cross ref.

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You might want to edit to explain your answer a bit more. If I “correct” the orientation, the circuit does not work at all. I will be certain to use them here from now am6884. 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. Fadecomic 2 6. Sign up using Facebook.

AN6884 Datasheet PDF

Right, I get that pin 7 is the output of the amp, but it’s part of the negative feedback loop on the dayasheet. However, if that’s the case, I can’t explain why reversing the capacitor doesn’t work, unless the actual polarity of the capacitor is backwards from what you think it is. Per AN’d datasheet. Pin 7 is the output of the internal amplifier, and datxsheet 8 is its input, designed to accept a low-level AC input 57 mV for a 0-dB indication.

So it determines the DC bias of the block capacitor’s polarity. Sign up or log in Sign up using Google. Sign up using Email and Password. Pin 8 is the signal input pin, and it’s the internal Op amp’s positive input.

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It appears to be reversed. Reverse biased capacitor on IC input pin Ask Question. Pin 8 accepts a positive input voltage. Capacitor with polarity can be used ac couple or blocking. How does doing anything to pin 7 or pin 8 affect that? If I remove the 2. Indeed, it aan6884 in order for any of the LEDs to turn on!

There is also no discharge path with your arrangement. Setting 7 higher than ground biases the low side of the comparators, allowing them to turn on with a lower output from the amp. The potentiometer is clear, but the 2. You should fix the capitalisation of sentences and electrical units ‘F’ for farad to improve legibility and credibility. 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.

Can someone explain what the reversed capacitor is doing here?

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

Have you tried a non-polarized capacitor e. Very confusing terminology, since the inverting input can have a higher voltage than the noninverting input.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The diode will mess up the response of the chip due to its forward voltage drop. Most people use “low” to refer to either a lower voltage, or a lower position on the diagram. 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.


To be clear, removing the capacitor doesn’t light up the LEDs all at once. This circuit will light the LEDs as the input voltage on pin 8 increases relative to pin 7. By “low side”, you’re referring an8684 the inverting inputs of the comparators. 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: By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of servicedatasheett policy and cookie policyand that your continued use of the website is subject to these policies.

It just shortens the range of turn over which the potentiometer works. Your description doesn’t agree with that in the datasheet. I’m not following you. Passing Vin through a reverse capacitor seems to be potentially more prone to failure.