I'm making a simple SMPS to create multiple isolated outputs to audio effects circuits.
I need to make a toroid pulse transformer which has one primary and at least 10 secondaries. These secondaries will be used in pairs to make 5 positive and negative outputs.
I've never wound my own transformer before so I have some basic questions :
Can I wind each 'pair' together. That is physically push two wires through the core together for each turn? Then use those pairs to create my positive and negative outputs? Will that have any effect on noise or galvanic isolation etc?
Can I safely wind my secondaries with thinner wire? The intention is that the primary will pass 3 amps, and each secondary will only be expected to supply 100mA or so. Is it safe to do that?
Will the transformer still work if the iron powder compound is not exactly right. So in an ideal world I'd be using a T130-3 (switching at 100KHz) But what if it's a T130-6 etc? Will it work, but just much less efficiently?
what would happen if I wound secondaries, on top of other secondaries? Would that work? So if I ran out of space on the toroid, could I just wind more secondaries on top of other ones? I appreciate that there'd be some difference in output voltage, but would those coils still work?
Sort of related to question 1. Would my negative secondary coils need to be wound in the opposite direction? And also, should my secondaries be wound in the same direction as the primary?
- T130 core size : OD-1.3" ID-0.7" height:0.25" (roughly)
- Type 3 iron powder (grey clear) : Carbonyl HP Permiability 35 80Khz-500Khz
- Type 6 iron powder (white clear) : Carbonyl SF Permiability 8.5 (10Mhz up)