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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Setting 7 higher than ground biases the low side of the comparators, allowing them to turn on with a lower output from the amp. That’s clear, because the input in my test circuit is DC. So it determines the DC bias of the block capacitor’s polarity. 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.

Sign up using Email and Password. Indeed, it must in order for any of the LEDs to turn on! You might want to edit to explain your answer a bit more. It appears to be reversed. By “low side”, you’re referring to the inverting inputs of the comparators. I am looking at the test circuits on the data sheet for the AN VU meter IC, and I cannot understand the connection to pin 8 in the following diagram: Sign up using Facebook.

There’s still a much shorter range over which a varying number of LEDs come on. Pin 8 accepts a positive input voltage. Right, I get that pin 7 is datasheef output of the amp, but it’s part of the negative feedback loop on the amp.

It’s the DC bias determine the 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 datashewt of the website is subject to these policies. 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.


How does doing anything to pin 7 or pin 8 affect that? This makes sense, but why not a diode? Sign up or log in Sign up using Google. I know the correct names, but I conversely find “inverting” and “noninverting” confusing when dealing with comparators, since those terms make more sense when dealing with op-amps.

The potentiometer is clear, but the sn6884.

I will be certain to use them here from now on. If I “correct” the orientation, the circuit does not work at all. That means there is a small current flow out from the pin.

5+1 led vu-meter with AN6884

This circuit will light the LEDs as the input voltage on pin 8 increases relative to pin 7. As displayed, the LEDs go from fully off to fully on over roughly the entire turn range of the potentiometer.

Email Required, but never shown. Passing Vin through a reverse capacitor seems to be potentially more prone to failure.

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

Capacitor with polarity can be used ac couple or blocking. Per AN’d datasheet. Most people use “low” to refer to either a lower voltage, or a lower position on the diagram. Eatasheet AN’d datasheetPin 8 is the signal input pin, and it’s the internal Op amp’s positive input. You should fix the capitalisation of sentences and electrical units ‘F’ for farad to improve legibility and credibility. Post as a guest Name. Vref is the high side of the 5 LED comparators in the datasheet block diagram.

By using our site, you acknowledge that you have read and understand our Cookie DataxheetPrivacy Policyand our Terms of Service. If I remove the 2. I’m not following you. 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.


Have you tried a non-polarized capacitor e. I’m not reading it that way. The diode will mess up the response of the chip due to its forward voltage drop.

To be clear, removing the capacitor doesn’t light up the LEDs all at once. Your description doesn’t agree with that in the datasheet. Pin 8 is the signal input pin, and it’s the internal Op amp’s positive input.

However, if that’s the case, I can’t explain why reversing the datasheet doesn’t work, unless the actual polarity of the capacitor is backwards from what you think it is. 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.

Can someone explain what the reversed capacitor is doing here? Fadecomic 2 6. An684 Questions Tags Users Unanswered. There is also no discharge path with your arrangement.

Reverse biased capacitor on IC input pin Ask Question. That is to say that the LEDs all come on at a much smaller datazheet of the potentiometer. Very confusing terminology, since the inverting input dwtasheet 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.

It just shortens the range of turn over which the potentiometer works.