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if you conect about 50 to 100 micro henr ferrite coil on + your batery, you wil be able to boost your jt and reduce usage of batery (sorry about my english) this is from Hartlay oscilator and works.
My jt works with 21 led's from led lamp. I use 4 bc 548 transistors, pc suply ferrite transformer and 54 micro henr ferrite coil to boost
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