Hi this will be trial to hand wound a usable MIC IPT on toroid core. Without the aid of expensive tooling and in the true spirit of DIY
What I would like is a good performing 1:8 MIC IPT to my 4in1 mic preamp.
Nanocrystalline toroidal cores. Vitroperm 500F
https://www.mouser.se/datasheet/2/599/V102-238079.pdf
This is a pretty large core for a mic trafo, but it will keep the primary inductance high and THD low and the leakage inductance is low anyway on toroids...
The discussion started in this thread:
https://groupdiy.com/threads/valve-mic-preamp-design-incoherent-rambling.77747/page-10
Pros: Toroidal core has natural ability to reject noise and has low leakage inductance. Cons: The challenge is to minimice the distributed capacitance in the secondarys that tend to degrade the performance...
The primary winding consist of a singel layer 0,25mm. 340T=10H. Which give good primary inductance and perfect symmetri for good cmrr.
The secondarys is to be layed in a progressive pattern. Im planning on using 0,15mm wire. I not sure if I manage to lay down perfect progressive pattern if that not practical I will resort to small and evenly spread section, where you basically lay the turns on top of each other....
Pictures from other trafo projects...
What I would like is a good performing 1:8 MIC IPT to my 4in1 mic preamp.
Nanocrystalline toroidal cores. Vitroperm 500F
https://www.mouser.se/datasheet/2/599/V102-238079.pdf
This is a pretty large core for a mic trafo, but it will keep the primary inductance high and THD low and the leakage inductance is low anyway on toroids...
The discussion started in this thread:
https://groupdiy.com/threads/valve-mic-preamp-design-incoherent-rambling.77747/page-10
Pros: Toroidal core has natural ability to reject noise and has low leakage inductance. Cons: The challenge is to minimice the distributed capacitance in the secondarys that tend to degrade the performance...
The primary winding consist of a singel layer 0,25mm. 340T=10H. Which give good primary inductance and perfect symmetri for good cmrr.
The secondarys is to be layed in a progressive pattern. Im planning on using 0,15mm wire. I not sure if I manage to lay down perfect progressive pattern if that not practical I will resort to small and evenly spread section, where you basically lay the turns on top of each other....
Pictures from other trafo projects...
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