Low budget choke for single ended class A amp

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zintolo

Member
Joined 2012
#1
Hi, I’ve seen many suggest to use microwave oven transformer as single-ended class-A mosfet amp.

Do you have suggestions on the characteristics that I need to look at?

What power can be expected to apply and which bandwidth?

I want to build a SE of around 20 Wrms o test one idea I has time ago, and then build a 100W version.

Expected efficiency is around 40%.

Thank you in advance
 
#2
All the info is here in this thread.
xrk971

Thread 'SuSyLu Where Are You?'

Edit Nov 2, 2021: Gerbers for the LuFo amp PCB needed for this project can be found here. A huge thank you for JPS64 for his generous time in making these layouts for the DIY community!

This is a spin-off of the LuFo amplifier discussed here, but it is sufficiently different enough that I did not want to confuse the technical detais already discussed in the other thread. Basically take two LuFo's, and connect them to a common inductively coupled choke with two primary windings, each going to ground, and wound such that the phases of the windings are opposite...
 
#3
Thanks @xrk971 ,
I’ve read 3/4th of the thread, but I’ve just found what was already known: 50-60 mH and <0,5 Ohm.
That thread refers to a push-pull amp, so it’s also quite different.

I will check with local suppliers, as by now I’ve only used small inductance c-core inductors.
 
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