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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By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of wn6884privacy policy and cookie policyand that your continued use of the website is subject to these policies. It’s the DC bias determine the polarity. The diode will mess up the response of the chip due to its forward voltage drop.

Sign up using Email and Password. Home Questions Tags Users Unanswered. By “low side”, you’re referring to the inverting inputs of the comparators. This makes sense, but why not a diode? You might want to edit to explain your answer a bit more. Fadecomic 2 6.

That is to say that the LEDs all come on at a much smaller turn of the potentiometer. Your description doesn’t agree with that in the datasheet. 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. Sign up using Facebook. If I remove the 2. Can someone explain what the reversed capacitor is doing here?

Per AN’d datasheetPin 8 is the signal input pin, datashedt it’s the internal Op amp’s positive input. Vref is the high side of the 5 LED comparators in the datasheet block diagram.


I’m not following you. I will be certain to use them here from now on. You should fix the an68884 of sentences and electrical units ‘F’ for farad to improve legibility ah6884 credibility. That means there is a small current flow out from the pin. Reverse biased capacitor on IC input pin Ask Question. Email Required, but never shown. Capacitor with polarity can be used ac couple or blocking. Setting 7 higher than ground biases the low side of the comparators, allowing them to turn on with a lower output from the amp.

Pin 7 is the output of dataasheet 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? Right, I get that pin 7 is the output of the amp, but it’s part of the negative feedback loop on the amp. By using our site, am6884 acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Indeed, it must in order for any of the LEDs to turn on!

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

Pin 8 accepts a positive input voltage. Have you tried a non-polarized capacitor e. If I “correct” the orientation, the circuit does not work at all. Pin 8 is the signal input pin, and it’s the internal Op amp’s positive input. I know the correct names, but I conversely find “inverting” daatsheet “noninverting” confusing when dealing with comparators, since those terms make more sense when dealing with op-amps. That’s clear, because the input in my test circuit is DC.


This circuit will light the LEDs as the input voltage on pin 8 increases relative to pin 7.

5+1 led vu-meter with AN6884

To be clear, removing the capacitor doesn’t light up the LEDs all at once. I am looking at the test circuits on the data sheet for the AN VU meter IC, and I aj6884 understand the connection to pin 8 in the following diagram: There is also no discharge path with your arrangement.

It appears to be reversed. 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. Per AN’d datasheet.

AN6884 Datasheet PDF

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. Most people use “low” to refer to either a lower voltage, or a lower position on the diagram. There’s still a much shorter range over which a varying number of LEDs come on.

Sign up or log in Sign up using Google. It just shortens the range of turn over which the potentiometer works. So it determines the DC bias of the block capacitor’s polarity. Post as a guest Name.