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On 2/13/23 4:20 PM, Joshua Thomas wrote:
Some of that article is genuinely hilarious.
“The output of each ignition coil … is fed through identical diode strings
each composed of 45 series-connected 1 amp 1000-PIV diodes”
Apparently this author never knew out the microwave transformer diodes!
Not so fast... Strings of 1n4007s were a standard technique. and way
more readily available (radio shack carried them!) and cheaper than
microwave oven diodes, Or K2AW stacks (which were 1n5408s matched and
stacked)
NTE had microwave oven rectifiers, but they were a pricey item ($20-ish
as I recall)
The big deal in the 90s was the inexpensive soft recovery 6kV diodes
with nicely controlled avalanche from Philips (now NXP, I think) because
you could string them up without RC equalizers (which I'm not sure don't
hurt more than help). They used a lot of those as building blocks in TV
flyback triplers (45-50kV), and in X-ray use (150 kV). When those
puppies started showing up surplus at $0.15 each, it was a real boon.
Look at parts like the BY716 or BYX90G
I've blown up my share of MO rectifiers, and some bridges built with
5408s. The oil insulated bridge from the 6kV parts 5 in a row on each
arm, really was tough. Even running pulse discharge stuff I never had a
problem.
On Mon, Feb 13, 2023 at 6:57 PM Lux, Jim <jim@xxxxxxxxxxxxx> wrote:
The LU800 coil referenced in the PopElectronics article is still
available. Around $15 depending on the source.
I have no idea what the electrical properties are, but I imagine it's a
fairly vanilla 12V coil.
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