Author Topic: Steve Ward's DRSSTC Interrupter stops working when adjusting pulse width  (Read 773 times)

Offline verliebt_in_neukölln17

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So early today I've built Steve Ward's DRSSTC Interrupter for my upcoming Tesla coil project and I've ran into a little trouble, the circuit was operating fine the first time I hooked it up, everything was working normally so i hooked up a small 5mm LED with a 330 Ohm resistor to pin 3 of the rightmost 555 timerwhich is the output and is also responsible for adjusting the pulse width with a 5K potentiometer, up until not even 5 mins, mind that the circuit ran for for 5 whole minutes with no problems, the output of the interrupter started spazzing out uncontrollably (which is most likely a curse since that happens with any circuit that i build), i double checked my wiring to no avail, now hooked up the circuit again where everything is working semi-fine again EXCEPT the 555 timer IC which is responsible for controlling the pulse width is somehow not fine, adjusting the pot even a tiny bit causes the interrupter to shut down and seize working and noticably heats up THAT single 555 timer,

Any help on clarifying me on how I should troubleshoot this circuit would be gladly appreciated,
I will provide my sloppy wiring if anyone specifically wants to see that
My semiconductors went kapow, IGBTs are fried somehow.
With sparks and pops, they took a flight,
Turning day into night!

Offline NyaaX_X

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Hello~

Please check the connection and soldering, if they match the schematic?
And if you replace the error one with a new 555, is the problem still there?
When you running the circuit without problem, is there any thing heating up?

Then if those are no help. I think the real photo for your circuit is good for online debugging.
« Last Edit: June 09, 2024, 01:36:46 PM by NyaaX_X »

Offline petespaco

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Bad 5K pot?

Offline Mads Barnkob

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Could be high frequency oscillations, from a bad potentiometer, that makes the circuit RC circuit for timing, suddenly have a very low R value or even also the C being defective, giving you a frequency in hundreds, maybe into MHz.
https://kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics
https://www.youtube.com/KaizerPowerElectronicsDk60/join - Please consider supporting the forum, websites and youtube channel!

Offline verliebt_in_neukölln17

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Hey, I’ve fixed the problem by placing a 1k resistor between the pot and pins 6 and 7, the bare pot was shorting the supply to gnd.
My semiconductors went kapow, IGBTs are fried somehow.
With sparks and pops, they took a flight,
Turning day into night!

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