Posts by dsavitsk

It of course depends. But, a MOSFET source follower is an easy and inexpensive option that is hard to beat. I like transformers, you you just may not have the juice to drive them (by the way, from the link in my signature, there is a...

Conceptually it can work, but there are a few technical issues you may run in to. First, that particular transformer is not what you are looking for. Instead, try this one: http://www.edcorusa.com/p/146/wsm10k-150 It is still not quite...

The only reason not to is that your friends' headphones won't fit in your amp, so you may need to make an adapter. But, it is otherwise a fine idea. Even better might be to use a 4 pin, connect pins 2 and 4 together, and then you can...

There is nothing really different about building a 45 amp for headphones or for speakers. You probably will want a quieter power supply, but frankly any speaker that can be driven by a 45 is so efficient that it needs a pretty quiet...

I am probably getting close to ordering another panel -- I'd like to order within a week. I'll need ~60 square inches, give or take, and I'll be happy to go half and half. I also won't need RoHS or 2oz copper on this one which will...

Form factor is the same. Basically we switched to a new and much nicer power transformer. This required altering the power supply a bit and moving some components around, but we were careful to keep the tubes and all panel components...

Prototype boards have arrived. Now Tomb just has to find a little free time to build one and see how they work.

It sets the current going through the FET. If the FET is biased at 9V (not sure what schematic you are looking at), and Vgs is ~4.5V (for the IRF510 and IRF610), then the resistor drops the remaining 4.5V. Using V=IR you can determine...

I have done this in the past. I'd link to where I posted the announcement, but it is against HF policy. GP is $110 for the panel ... + $30 for adding more designs (up to 6, it then goes up again with more), +$20 for 2oz copper which I...

Quote:Originally Posted by pmillett Though a tube is certainly a novelty, maybe a single-ended JFET stage is more practical.  You can get a JFET circuit to sound and measure an awful lot like a SE tube. Might be useful:...