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AN6884 Datasheet PDF

Home Questions Tags Users Unanswered. How does doing anything to pin datashwet or pin 8 affect that? It just shortens the range of turn over which the potentiometer works. You might want to edit to explain your answer a bit more. Can someone explain what the reversed capacitor is doing here?

Dztasheet 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 wn6884 capacitor. Setting 7 higher than ground biases the low side of the comparators, allowing them to turn on with a lower output from the amp. Reverse biased capacitor on IC input pin Ask Question.

Sign up using Email and Password. 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.

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I’m not reading it that way. Pin 8 accepts a positive input voltage. Per AN’d datasheet. Right, I get that pin 7 is the output of the amp, but it’s part dataasheet the negative feedback loop on the amp.

5+1 led vu-meter with AN6884

Placing it at a datassheet 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. Email Required, but never shown.

There’s still a much shorter range over which a varying number of LEDs come on. You should fix the an688 of sentences and electrical units ‘F’ for farad to improve legibility and credibility.

(Datasheet) AN pdf – 5-Dot LED Driver Circuit (1-page)

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. Indeed, it must in order for any of the LEDs to turn on! Vref is the high side of the 5 LED comparators in the datasheet block diagram. Capacitor with datsheet can be used ac couple or blocking.

If I remove the 2. This makes sense, but why not a diode? The potentiometer is clear, but the 2. That’s clear, because the input in my test circuit is DC. Have you tried a non-polarized capacitor e. Pin 8 is the signal input pin, and it’s the internal Op amp’s positive input. That darasheet there is a small current flow out from the pin. Sign up or log in Sign up using Google.

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AN 데이터시트(PDF) – Panasonic Semiconductor

I’m not following you. If I “correct” the orientation, the circuit does not work at all. However, if that’s the case, I can’t explain why reversing datasehet capacitor doesn’t work, unless the actual polarity of the capacitor is backwards from what you think it is.

The diode will mess up the response of the chip due to its forward voltage drop.

Your description doesn’t agree with that in the datasheet. I will be certain to use them here from now on.

Passing Vin through a reverse capacitor seems to be potentially more prone to failure. Post as a guest Name. I am looking at the test circuits on the data sheet for the AN VU meter IC, and I cannot understand the datashset to pin 8 in the following diagram: 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.

To be clear, removing the capacitor doesn’t light up the LEDs datasueet at once.