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Topics - duclon

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Amplifier Discussion / anyone ever build any small class D projects?
« on: July 09, 2007, 03:37:51 PM »
I'd like to experiment with a class D design, but I can find anything that is simple or small. Do they exist, i mean any designs for low end or lower power class D amps?
I would be cool to see anything anyone on here has built that is Class D.
Mike

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Amplifier Discussion / help with issue in my amp
« on: June 27, 2007, 08:32:25 AM »
I've built a small 12v DC practice amp. Here is a simple issue, for someone other than me. i searched but did not find an answer. When i have nothing plugged into it, there is a loud hum, or buzz. when i plug in an instrument it goes down, not away. when I touch the instrument jack or the metal that all the pots and jacks are mounted to it pretty much goes away. So I know this has to be simple but this is my first amp and i am missing it.
Any help?
Mike

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Amplifier Discussion / measuring input impedance of my amp
« on: June 15, 2007, 08:22:42 PM »
Sorry if this has been discussed before but I searched and could not find a definitive answer.
Is there a way to accurately measure the input impedance of the amp I'm building.
I need 1.8 M ohm or a little more for the instrument I'm designing the amp for.
anyone know how using some basic test equipment, multi-meter, oscilloscope?

Mike

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Preamps and Effects / Stereo Preamp Question
« on: April 19, 2007, 09:10:12 AM »
I've built a small amp based on the Ruby. I added a tone stack between the input and amp and it works well. what I need to do is have stereo inputs as I have a stereo instrument. Both need the tone stack. I tried just adding another input with a tone stack and it lost a lot of volume and didn't sound very good.  It hadd some weird issues when I adjusted one the other would drop in volume. that may have been a wireing error.
So can anyone advise me how to place the tonestacks.  and combine the 2 signals.
Do I need some boost on each signal.
Do I need a resister inline of each input signal beore the tone stacks.
The pickups I have a passive.
Mike

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