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Posts by Avro_Arrow

USB 3 ports are backward compatible with USB 2Sounds like you have a short in your pupDACThe voltage regulator usually gets only mildly warm, not much above room temperaturein normal use. The Doodlebug can protect itself from shorts with an auto reset fuse.Go over all the solder joints and look for any bridges.
Yes, it provides complete galvanic isolation. Just make sure your device works at USB full speed, not low speed or high speed. Edit: I think your interface may be a low speed device. Contact the manufacturer to make sure.The Doodlebug can be hacked to run at USB low speed.
The Doodlebug does nothing on it's own, that is, it is not recognized as a device by the computer. It is locked at USB full speed and will not work with devices at USB low speed or USB high speed. If you have a mouse that runs at USB full speed, it should work, but I think most mice are USB low speed devices. The 5.25 volts shows the power supply is working properly. New devices (ones that have not been connected to your computer before), may need to be plugged in...
No, it doesn't work like that. You have to bias each op-amp output that you want to have in class A. Your not injecting bias into the V- rail, your drawn a small current from the output to the V- rail.Some op-amp benefit more from this than others, your mileage may vary.
If you are lucky you might get away with just replacing the output MOSFETs and resistors. I was not so lucky. I tried to repair a B22 board and it just kept blowing the outputs. I recommend building a new channel.   Good luck!
A cMoy is what a cMoy is. It doesn't really go out of date. Tangent's guide is pretty good at holding your hand through the process. Just read it all the way through. Let us know how it goes!
I want to abide by the thread rules of not saying anything negative, so I will just keep quiet.If the snake oil makes them happy then let them be happy.
Here is my contribution:   317/337 (and family) adjustable regulator tweak.   Replace the voltage setting resistor with a semiconductor.   Typical 317 regulator implementation:   Typically R2 sets the current through R1 and the voltage drop of R1 plus 1.25 volts is the output voltage.   Now if we replace R1 with an LED or two, we get this:   Now, once again, in this schematic, R1 sets the current and the voltage drop across the LED(s) plus 1.25 volts is...
Lawn Flower  
I did something like that back in the early eighties...
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