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Answer it!
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I think the Duty cycle of the timer chip needs to be higher and you can't use a 2n3055 a IRFP450/60 will do the job.
Look at this site it will explain how the circuit works. (Don't copy the circuit off that site you will get a voltage way higher than what you need, reduced duty cycle on the sites circuit would fix that problem).
Other than that the TC circuit looks fine. (Maybe I wouldn't ground the TC to my circuit).
Look at this site it will explain how the circuit works. (Don't copy the circuit off that site you will get a voltage way higher than what you need, reduced duty cycle on the sites circuit would fix that problem).
Other than that the TC circuit looks fine. (Maybe I wouldn't ground the TC to my circuit).
The primary spark gap resonator looks normal and is driven by an igntion
coil with isolating inductors feeding energy to the spark gap.
coil with isolating inductors feeding energy to the spark gap.
- The NPN 2N3055
- VCBO = 100V not very encouraging
- Ic = 15A
- IB = 7A
- Hfe = 20min 70 max DC gain may be more @ lower gate drive
- Means only saturate 6A @ 20Hfe and possibly 15A @ 70Hfe
- Because a 555 can deliver 300ma
- Power dissipation = 115W with huge heat sink.
- I don't see kickback protection for the power NPN
- Or a 470uF across the source 12VDC power.
- The door bell is a poor switch.
- I would tie the ignition coil ahead of the bell switch.
- And move the ground connect to the NPN emitter to avoid upsetting the 555 with a ground loop.
Is there a precedent for that design of HV driver?
What coil structures, chokes, capacitors and SG do you propose to use?
L
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