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Placing it at a higher voltage within the datasheet’s max specified V will both dagasheet the amplification and raise the lower rail of the comparators in the block diagram. Per AN’d datasheetPin 8 is the datqsheet input pin, and it’s the internal Op amp’s positive input. There’s still a much shorter range over which a varying number of LEDs come on. I will be certain to use them here from now on. Email Required, but never shown.
Right, I get that pin 7 is the output of the amp, dataeheet it’s part of the negative feedback loop on the amp. There is also no discharge path with your arrangement.
That means there is a small current flow out from the pin. As displayed, the LEDs go from fully off to fully on over roughly the entire turn range of the potentiometer. Sign up using Email and Password.
AN6884 Datasheet PDF
Pin 8 is the signal input pin, and it’s the internal Op amp’s positive input. Datazheet 8 accepts a positive input voltage. Sign up using Facebook. You should fix the capitalisation of sentences and electrical units ‘F’ for farad dstasheet improve legibility and credibility.
Very confusing terminology, since the inverting input can have a higher voltage than the noninverting input. Vref is the high side of the 5 LED comparators in the datasheet block diagram.
Home Questions Tags Users Unanswered. 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 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.
How does doing anything to pin 7 or pin 8 affect that?
AN Datasheet pdf – 5-Dot LED Driver Circuit – Panasonic
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Passing Vin through a reverse capacitor seems to be potentially more prone to failure. Have you tried a non-polarized capacitor e.
You might want to edit to explain your answer a bit more. It just shortens the range of darasheet over which the potentiometer works. That is to say that the LEDs all come on at a much smaller turn of the potentiometer.
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. 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.
If I remove the 2. Reverse biased capacitor on IC input pin Ask Question. It’s the DC bias determine the polarity.