Why no DIY preamp input/mic output irons?

[CJ]

that stuff will not turn gooey, but it will get soft enuff to dig out small chunks with a dental pic,

if the inner winding is still good, you can count it and use the turns ratio to get the outer winding,

 

[MicDaddy]

Ah yes of course!

Wire thickness is thin and much thinner. I'll gather DC measurements at a length of a foot, not sure how those will lineup with the charts.

Several more layers to go

 

[CJ]

Glassine or 3 mil nomex?

 

[MicDaddy]

Good question.. you know better  ;D

Stuff is more like a plastic film than a paper, and looking at Nomex it seems it's DuPont™  perhaps this is Nomex??

Increase of distance between plates decreases capacitance, is that what is happening with this many wraps of the clear stuff, to bring down capacitance between the different windings with distance/gap by addition of layers of the material?

I should have it done today... hopefully with a count of one of the windings.

 

[CJ]

yes you are decreasing the pri-sec leakage C so the rez peak is shoved down the line,

that Nomex is good for 1 KV per mil, so 10 wraps of 3 mil would be 30KV of isolation which should provide protection against most ground loops unless you get your power from a lightening rod,

 

[MicDaddy]

Hey CJ, all of the Nomex I'm finding looks like white paper, but the stuff I dereeled from this Jensen is almost like polycarbonate or other plastic film.  ??? 

Nickel cores and bobbins are on the way.

Where is anyone getting mu cans from?

 

[Whoops]

Loving this thread, just been turned into transformer building  lately and I'm learning a lot with all you guys.

Hopefully I will also be able to build my own transformers

 

[MicDaddy]

Just some playing with these new lams

 

[Whoops]

Nice,
I can see you had a good day!!!

 

[MicDaddy]

Still learning.

This stuff is supposedly 80ni and doesn't take much signal to distort.

Dunno what frequency the Sencore uses, it doesn't say and I haven't looked it up.

100turns

300 turns (remember this is the outer-most winding as I added it on top of 500 turns, which is on top of the 100 turns winding)

500 turns

500 + 300 turns (Sencore only does up to 10H, and @ ? Hz)

 

[CJ]

LC53, old school, used one for years, try the ringing test, 

(used for TV stuff)

great for caps, signal generator and ammeter is better for inductance, is that the 25 or 35 core?

 

[MicDaddy]

It's the 25, no I bars.

From some quick and dirty calculations I get close to what the Sencore was getting for L at 1kHZ at 1V.  I don't know how that thing works, and I don't have the best eye for detecting if my signal is still pure sine.

Now to try and make something useful.

 

[Bonke]

Great thread!!!

 

[CJ]

how much do you want for that scope?

does it do BH loops?

 

[MicDaddy]

Never thought to try for BH curves until now that you brought it up CJ, this guys seems to have something going on.. .I'll have to dig in the manual.

I did figure out how to observe phase with x-y mode but it assumes you can extract an angle from a Lissajous pattern. Anything outside of 0, 90, 180, & 360 is tough to put a precise number to, unless there's a way for the scope to tell me but I haven't figured that out yet.

 

[shabtek]

if my bench were half as clean as yours...

 

[MicDaddy]

if my bench were half as clean as yours...

For me the key is have at least 2x benches,  8)