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

That means there is a small current flow out from the pin. Capacitor with polarity can be used ac couple or blocking.

Email Required, but never shown. There’s still a much shorter range over which a varying number of LEDs come on. I know the dafasheet names, but I conversely find “inverting” and “noninverting” confusing when dealing with comparators, since those terms make more sense when dealing with dataasheet. This makes sense, but why not a diode? Vref is the high side of the 5 LED comparators in the datasheet block diagram.

Have you tried a non-polarized capacitor e. Post as a guest Name. If I remove the 2.

This circuit will light the LEDs as the input voltage on pin 8 increases relative to pin 7. The potentiometer is clear, but the 2. Home Questions Tags Users Unanswered. Sign up or log in Sign up using Google. It just shortens the range of turn over which the potentiometer works. It appears to be reversed. The LED pins connect to the negative side of the LEDs, and the pins go low when the output of dataseet internal amp goes above Vref dropped by voltage dividing resistors at each comparator.


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

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

Your description doesn’t agree with that in the datasheet. So it determines the DC bias of am6884 block capacitor’s polarity. 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.

Can someone explain what the reversed capacitor is doing here? Most people use “low” to refer to either a lower voltage, or a lower position on the 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.

5+1 led vu-meter with AN – “Arduino tehNiq”

Reverse biased capacitor on IC input pin Ask Question. I’m not reading it that way. Very confusing terminology, since the inverting input can have a higher voltage than the noninverting input.


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.

Pin 8 accepts an684 positive input voltage.

(PDF) AN6884 Datasheet download

Setting 7 higher than ground biases the low side of the comparators, allowing them to turn on with a datxsheet output from the amp. That is to say that the LEDs all come on at a much smaller turn of the potentiometer.

You might want to edit to explain your answer a bit more. There is also no discharge path with your arrangement. By using our site, you 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! 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. Datsheet up using Facebook.

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