Author Topic: OneTesla SD Interrupter extending On-Time?  (Read 145 times)

Offline Phoenix

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OneTesla SD Interrupter extending On-Time?
« on: April 14, 2018, 07:43:41 AM »
Hello everyone,

i have just bought and built the OneTesla Midi Interrupter for my homemade 160mm DRSSTC and it works very good but i have a question: The Interrupter only goes up to about 80uS of Ontime in the Midi mode. Currently, i am running my coil only on 350V DC. The issue now is that i will not reach the full primary current of 1000A with such a low Ontime and therefore my sparks are not as long as with my homemade Interrupter and 300uS On-Time.

Is there a way to change that on the SD Interrupter? Do i have to change the code for that and what do i need to change? I already have a large MMC (375nF) but the primary current does not ramp up fast enough in 80uS. Should I convert my coil in the future to run on 3 Phases rectified (565V)? But i do not own a 3 Phase Variac and i am a little bit umcomfortable if I can not ramp up the voltage slowly with a Variac.

Greetings,
Phoenix
« Last Edit: April 14, 2018, 07:45:51 AM by Phoenix »

Offline futurist

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Re: OneTesla SD Interrupter extending On-Time?
« Reply #1 on: April 15, 2018, 12:24:02 PM »
It's very simple, download their SD interrupter firmware http://onetesla.com/media/SDinterrupter.zip, edit LOOKUP_TABLE_SCALE constant in constants.h file and upload the code using arduino IDE

Code: [Select]
//on-times in microseconds, don't forget to multiply by LOOKUP_TABLE_SCALE!
#define ON_TIME_ARRAY_LENGTH 26
static byte on_times[] =
{33, 33, 33, 33, 27, 23, 20, 20, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 8, 8, 8, 8, 8, 8, 8};

LOOKUP_TABLE_SCALE will multiply on-times for different notes/bps, for example if LOOKUP_TABLE_SCALE is set to 3, max. on-time will be 99 us

Offline Phoenix

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Re: OneTesla SD Interrupter extending On-Time?
« Reply #2 on: April 15, 2018, 05:15:21 PM »
Thank you very much for your response it helps a lot  :)

I have never done anything with an Arduino so i have a question: The Interrupter has a connector called AVR-ISP. Can i hook up the Interrupter to the Arduino as shown in this image? https://www.arduino.cc/en/uploads/Tutorial/Arduino_ISP_wires.jpg

Greetings,
Phoenix
« Last Edit: April 15, 2018, 06:12:22 PM by Phoenix »

Offline futurist

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Re: OneTesla SD Interrupter extending On-Time?
« Reply #3 on: April 23, 2018, 06:37:53 PM »
Yes, that should do the job

Sorry for late answer

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Re: OneTesla SD Interrupter extending On-Time?
« Reply #3 on: April 23, 2018, 06:37:53 PM »

 


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