The DD-1 is provided along with a test CD that includes nine tracks: The DD-1 alerts THD (distortion) detection once the THD is greater than 1% (no this is no a mistake, not 0.1 nor 0.01 but greater than 1%) The DD-1 is measuring THD, not Voltage RMS, not showing you sine wave clipping – neither does voltage nor clipping can tell you how much THD you have in your audio channel (in fact clipping comes after THD is audible for best of my knowledge). So what does it measure? What does it do? And why it is “revolutionary” in compare to the old school methods of testing with an Oscilloscope and Multi-meter? What is the DD-1 product purpose? DD stands for Distortion Detector (1 is the version) Steve Meade and D’amore industries are mainly SPL oriented for the best of my knowledge but some of the measurements products and tools they offer today are easily qualifying for tuning SQ oriented audio systems as well. Not sure if this product was already reviewed over here but I would like to post my impressions any way as it is a fabulous little “Gizmo”. Oh btw, the amplifier will be output a 50hz sine wave for the detector to work with.My name is Eddie and I am located at Israel. I'm not sure if I should have looked at messing with the comparators resistor values because I am a newb with comparators, they sort of confuse me.Īnyway, so I was wanting to ask, can I use another comparator to reduce the amplifiers 100+ possible volts when I need it too? Basically I can expect to deal with as little as 35v give or take(from the amplifier) to say 300 like i previously mentioned so I am assuming a simple resistor voltage divider dosn't work? And it would be inefficient? Maybe I'm thinking to hard about this, any ideas for the circuit I'm trying to implement? The crazy high voltage from the amplifier is what is difficult for me to deal with. Well, I modeled a simple resistor voltage divider to proportionally reduce the input voltage within range(from say 150v from the amplifier output to 6v for example) but the led dosn't light at low dc voltage of say 1 volt because of how much I lowered it. I was thinking of using a 741 or tl082 so my input needs to be under 15v iirc. My issue is the voltage range of op amp input. The dc, if any will pass and light an led at the output. There is a capacitor on one of the inputs to filter the dc from one of the inputs so that only ac will be the same at both inputs, causing it to not be "amplified" by the output. So far I have been modeling a common mode comparator that filters out any ripple voltage. So, I have studdied alot, I have reached the section of the ebook of ADC/DAC but I dont have a wole lot of experience and I dont have all of the material down so I'm a newb. Basically I move the gain knob until it clips and back off slightly.Īmplifier power is so cheap these days that I can be dealing with around upto 300 volts from the amps output, or atleast that is where my limit is going to be made as far as compatibility goes. It will be used with upto very high output caraudio amplifiers as a tool to set gain so that I can connect the output terminals to it and have an led light as soon as it detects clipping. Okay, I am trying to design a simple clipping detector circuit.
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