pulse transformer to trigger SCRs - roll yer own?

Question

I have a .75 inch diameter toroid core I picked up surplus and I would like to wind a simple pulse transformer (aka trigger transformer) to turn on a back-to-back SCR pair for a one-off project (it's an etch tank heater). The core had two windings of 8 turns on it (18 guage - not bifilar) and was apparently made by Pulse. I measured the inductance of the 8 turn winding and it was pretty low (2 uh on a cheap multimeter L scale) so I'm guessing a fairly low mu ferrite.

I have some #30 AWG magnet wire lying around. Will winding it around once with a trifilar winding be likely to work or is it much more involved than that?

Haven't found much info on winding these things on the net.

Any suggestions or net resources would be appreciated. TIA. mr coffee

D from BC · Accepted Answer

I only use cores that come with data sheets.D from BC

Rich Grise · Answer

Have you tried just using it as is? It's only a transformer, after all.Good Luck!Rich

John Tserkezis · Answer

Pulse transformers don't comply with "normal" transformer theory. I never did have an application were it was critical though, so, so far, I've been able to get away with 'round about' numbers.

Tim Williams · Answer

Every pulse transformer I've made (typically with bandwidth from 1 to 20kHz as the minimum requirement, on up to 10 or 20MHz typical cutoff frequency) has worked like a transformer, and most closely like a transformer with lumped constants considered (L, LL, C and DCR).

Tim

-- Deep Fryer: A very philos>

never

joseph2k · Answer

Since when; physics is physics.Physics is physics.--  JosephKK Gegen dummheit kampfen die Gotter Selbst, vergebens.    --Schiller

amdx · Answer

Here's a great high side Mosfet gate driver where you might glean some useful info.                                Enjoy, Mike

Frithiof Andreas Jensen · Answer

skrev i en meddelelse news:It probably works - for a one-off garage project.  I would use teflon wire-wrap wire though to get some (not safety rated!!!) insulation. It is better to just buy one, I think.

pulse transformer to trigger SCRs - roll yer own?

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