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Small signal audio transformer design for a vacum tube microphone

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SK_Caterpilar_SK:
well...turns out either the core isnt what it should be but the permeability is not 8700nH... Or I am just somewhere goofing up again and I might need kilometers of wire...I may just got with the transistor output here.. It appears this might be just too much for me.

T3sl4co1l:
What signal level?

Did you accidentally get a gapped core set?

Tim

SK_Caterpilar_SK:
no, the cores are perfectly flush no light visible trough the center..

i was doing this test very crude with a 9V batt and very quickly just touched it hping the scope captures it in single mode. the permeaility is more like 270 than 2700. then the calculation fits reality..

SK_Caterpilar_SK:

--- Quote from: SK_Caterpilar_SK on April 22, 2020, 10:41:14 pm ---no, the cores are perfectly flush no light visible trough the center..

i was doing this test very crude with a 9V batt and very quickly just touched it hping the scope captures it in single mode. the permeaility is more like 270 than 2700. then the calculation fits reality..

--- End quote ---

if 270 is the real deal then my secondary should be 700 turns and primary 3500turns to get me the desired inductance. I guess I could have been better off buying it or not trying to build this thing at all. stuff like this really shows how bad I am at electronics

sam[PS]:
Dont give up SK_Caterpilar_SK, that doesn't show you are bad, that shows you are doing something ;)

That's what real world electronic is about. You try one thing, it fail, you adjust what's needed, it get's closer, rince, repeat,  and eventually at some point you end up with something close enough. And yes sourcing the right part is a much bigger part than most imagine and often you have to adapt your design to the part you got. That's what this game of real world electronic is about.

So get few days off the project then put "the eye of the tiger" loud on your stereo and stand back up on the ring  :box:

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