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Your description doesn’t agree with that in the datasheet.

That’s clear, because the input in my test circuit is DC. The potentiometer is clear, but the 2. 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. Most people use “low” to refer to either a lower voltage, or a lower position on the diagram.

Placing it at a higher voltage daasheet the datasheet’s max specified V will both lower the amplification and raise the lower rail of the comparators in the block diagram. This makes sense, but why datasneet a diode?

So it determines the DC bias of the block capacitor’s polarity. Sign up using Facebook. Right, I get that pin 7 is the output of the amp, but it’s part of the negative feedback loop on the amp. As displayed, the LEDs go from fully off to fully on over roughly the entire turn range of the potentiometer.


To be clear, removing the capacitor doesn’t light up the LEDs all at once. Vref is the high side of the 5 LED comparators in the datasheet block diagram. You should fix the capitalisation of sentences and electrical units ‘F’ for farad to improve legibility and credibility. There is also no discharge path with your arrangement.

AN6884 Datasheet PDF

Have you tried a non-polarized capacitor e. It just shortens the range of turn over which the potentiometer works.

It sounds like you’re trying to drive an688 circuit with a signal that includes a considerable DC bias, which dataxheet why all of the LEDs vatasheet up right away when you remove short out the capacitor. I will be certain to use them here from now on. I’m not following you. Very confusing terminology, since the inverting input can have a higher voltage than the noninverting input.

Fadecomic 2 6. Datasheey as a guest Name. 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.

It’s the DC bias determine the polarity. It appears to be reversed. You might want to edit to explain your answer a bit more. If I “correct” the orientation, the circuit does not work at all. Sign up or log in Sign up using Google. Home Questions Tags Users Unanswered.


Per AN’d datasheet. By “low side”, you’re referring to the inverting inputs of the comparators. Pin 8 accepts a positive input voltage.

There’s still a much shorter range over which a varying number of LEDs come on. That is to say that the LEDs all come on at a much smaller turn of the potentiometer. Reverse biased capacitor on IC input pin Ask Question. This circuit will light the LEDs as the input voltage on pin 8 increases relative to pin 7. Aj6884 Vin through a reverse capacitor seems to be potentially more prone to failure.

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

Sign up using Email and Password. 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 8 is the signal input pin, and it’s the internal Op amp’s positive input.