Yesterday I did a lame try in my old Schade/mosfet thread, to marry Zenductor and Schadeode to get a 2-stage Zenductor that solves the problem with low senistivity and low Zin. Had my thinking cap on overnight and got the idea to simplify the one I came up with yesterday. Probably this needs fine tuning, but it looks promising. Due to distorsion cancellation the even harmonics are lowered but the spectrum still is nicely falling. Just did temp simulationsand they seemed OK.
Must build a prototype using the Hammond 193 I have.
Must build a prototype using the Hammond 193 I have.
Last edited:
Tried the input device source resistor to -19V instead of ground. Result is "better" linearity, but lower sensitivity, probably due to even more local feedback of the input device. Also seems to give more even order distortion cancellation.
Last edited:
Yo, Daniel, was just about to contact you to discuss the circuit. Hasse and I also have an EL36/PL36 hybrid SE design on the same theme that we want to discuss. The right one seems very temperature stable.
Founds this choke in my warehouse, good enough for prototyping ;-).
Founds this choke in my warehouse, good enough for prototyping ;-).
Last edited:
The choke seems like a good choice for this kind of projects, 2A DC should be good for 16W @ 8R if my math is correct.
I have some surplus chokes in the shelves that are begging to be used in similar projects, two large 112mH 2A EI-cores and a few smaller dual C-cores that measures ~50mH and with an estimated current rating around 1A.
A bit OT, but I've been looking for depletion mode FETs with the right Vgs to match the voltage drop across the Dcr of either of those chokes at a reasonable current. The ideá is to build a simplistic, self-biased FET follower with an absolute minimum of components: Gate leak resistor, gate stopper, FET, choke, output cap and a PSU.
I have some surplus chokes in the shelves that are begging to be used in similar projects, two large 112mH 2A EI-cores and a few smaller dual C-cores that measures ~50mH and with an estimated current rating around 1A.
A bit OT, but I've been looking for depletion mode FETs with the right Vgs to match the voltage drop across the Dcr of either of those chokes at a reasonable current. The ideá is to build a simplistic, self-biased FET follower with an absolute minimum of components: Gate leak resistor, gate stopper, FET, choke, output cap and a PSU.
Something like an IXTP3N50D2 would probably work, though the current rating is a bit low.
Otherwise a cascoded LU1014D would be the obvious choice, as described in the LuFo thread.
Even I could use a little bit of voltage gain sometimes and the Zenductor is something I've got to try someday.
Building the circuit shouldn't be a problem, but I've gotten lazy when it comes to metal working...
Otherwise a cascoded LU1014D would be the obvious choice, as described in the LuFo thread.
Even I could use a little bit of voltage gain sometimes and the Zenductor is something I've got to try someday.
Building the circuit shouldn't be a problem, but I've gotten lazy when it comes to metal working...