I used lower voltage zener with IRFP240, for example. 6V2 suited well for my case and luck (not for MoFo, but for one close cousin, the "power follower"), but a bit higher is better for accounting with productions variations.
For maximum MOSFET protection, the zener is located this manner (directly to the MOSFET pins), for not developing extra voltage if inductor kicks back.
I have two board sets (2 each for stereo) that I'm happy to give away no cost. I ordered extras when I had them produced. I'd like them to go to two different people, ideally anyone who is on a tight budget (but then, how would I check?). I'll even cover shipping provided it isn't too expensive. Please PM me, don't post here. I'm saving two more sets for my kids in case they want to try it out. Those may become available eventually if they aren't interested.
On another note, I only have 0.15 ohm resistors on hand for the test resistor. Of course, I'd have to look for 0.255v across them, instead of 0.17v (which means they eat 0.085v more than the 0.1R test resistor), but other than that, is there any problem using these? Note that I can't quite measure these accurately with any of my meters but I bought them as 0.15R maybe 8-10 years ago, so assume they are at least close to that. Thx.
Hello,
I have two Hammond 193T inductors left. Anyone interested? They're like new. Tested only once. Shipping from Germany.
I have two Hammond 193T inductors left. Anyone interested? They're like new. Tested only once. Shipping from Germany.
This one works with to247 or sot227.
When using sot227 mosfet you can go up to 35v with the ps voltage and 3.5a bias. Well to be able to do this you will need a big heatsink capable to accomplish the task.
When ordering the parts be careful to order the voltage rating for the caps accordingly, if you plan 35vdc ps order 50vdc caps.
I live in Europe so I buy my chokes from Ogonowski. He has them cheap, 150mh/4a for about 40e iirc.
Here some thd measurements
I am attaching schematic, bom and gerbers for last revision of the pcb.
When using sot227 mosfet you can go up to 35v with the ps voltage and 3.5a bias. Well to be able to do this you will need a big heatsink capable to accomplish the task.
When ordering the parts be careful to order the voltage rating for the caps accordingly, if you plan 35vdc ps order 50vdc caps.
I live in Europe so I buy my chokes from Ogonowski. He has them cheap, 150mh/4a for about 40e iirc.
Here some thd measurements
I am attaching schematic, bom and gerbers for last revision of the pcb.
Still curious about this one
I ordered these days some center tapped inductors to see how things go for something bridged.
A high bias will be very useful in this case.
It's sitting on my bench. I finished it last year, but got delayed by life stuff. Coming this year. 🙂
Next up in the four part trilogy is MoFo+
Next up in the four part trilogy is MoFo+
I imagine a bridged MoFo, each half of the bridge driven by a high bias. And then a balanced preamp, like BoSoZ (maybe this one can be loaded with inductors too, just for the sake of using the Iron everywhere where possible). Would make for a nice (and heavy) birthday present for Nelson 😀
Three more parts to go:
MoFo+ is just an update, Then Mo Better MoFo, and finally, The Big Mobowski
That's all I have for now. 🙂
MoFo+ is just an update, Then Mo Better MoFo, and finally, The Big Mobowski
That's all I have for now. 🙂