I taught my son Jacob, 5 years old, to ride his bike today without the training wheels. A slightly scuffed knee but otherwise riding like a champ!!!! He's beaming with joy. Next thing I know I'll be teaching him how to launch off the trans-brake
I have greatly reduced the 6V6 tubes' microphonics by adding these high temperature silicone rubber o-rings. There are places on line that sell the exact same "damping" rings for $5 each. I got these from McMaster-Carr... package of 10 for $6.69
Guess I'll hijack my own thread a little... I'll be getting back on this class D project soon. I've just been busy finishing up that tube pre-amp project, helping my son build a Pine Wood Derby car, and building some snow people.
This is just a picture of parts sitting approximately where they will end up living. I need to machine that back aluminum plate and paint it black to match, drill a bunch of holes, insert some grommets, mount all the bits and pieces, then wiring everything. This sucka should rock!
Ok here is the next to last safety step. It is a power supply bleeder resistor. This ensures that all of the high voltage potential stored in the power supply caps is bled off to zero volts in a reasonable amount of time. I used a 220K Ohm, 2 Watt resistor. During power on it only dissipates 0.5 Watts. When the power switch is turned off it drops the voltage down to a safe level in under 60 seconds. Here is a picture (the small green power resistor):