Author Topic: Single Transistor SSTC  (Read 5455 times)

Offline E-Schmok

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Single Transistor SSTC
« on: May 08, 2017, 11:12:23 AM »
Hello and Servus!

To introduce myself i want to show you my work on a very small but powerful single Transistor teslacoil i worked on.
My objective was to achieve a remarkable output power, - compared to the coils size -, while keeping the input voltage as low as possible to power it from battery/akkumulator.
The driver should be as simple and cheap as possible.
For now i think i have achieved this objects but its still a work in progress to improve this whole setup. Next step is to implement an audio/midi interrupter via fiber optic. to keep it cheap i decided to use a Toslink fiber optic Connection, - which was originally designed for digital audio -, instead of an old, ordinary and expensive ST connection.



to simplify this circuit the step up section can be omitted, i just added this section to allow powering from a lead acid battery.
iam proud that this coil has been reproduced by Gianni Laschi: https://www.youtube.com/watch?v=cAyBtGEq4-0&t=3s

the single transistor coil is shown at the end of this clip: https://www.youtube.com/watch?v=BLuoPAYlZJ4

coil specs:



feel free to ask any question!
i will add pictures soon. ;-)
« Last Edit: May 08, 2017, 01:59:39 PM by E-Schmok »

Offline oneKone

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Re: Single Transistor SSTC
« Reply #1 on: June 26, 2017, 07:28:43 AM »
That is friggin awesome! Nice work...... I'm definitely going to add this to the list of sstc I wanna make.

Offline E-Schmok

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Re: Single Transistor SSTC
« Reply #2 on: June 26, 2017, 10:43:31 AM »
That is friggin awesome! Nice work...... I'm definitely going to add this to the list of sstc I wanna make.
Thank you, I feel flattered! Feel free to ask any question.

Offline CCX191

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Re: Single Transistor SSTC
« Reply #3 on: June 27, 2017, 04:26:56 PM »
Single transistor with such performance.. nice! Probably a good way to save money XD

I should perhaps try to build this next.

I've watched several of your videos in Youtube too. (let me subscribe to it now :D)

I admire your work and wish to see more that you have to made :)

Offline oneKone

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Re: Single Transistor SSTC
« Reply #4 on: July 12, 2017, 01:01:11 AM »
Hey E-Schmok,
I don't suppose you could give the specs of the coil? For some reason the link is dead for me.
Cheers.

Offline E-Schmok

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Re: Single Transistor SSTC
« Reply #5 on: July 20, 2017, 03:55:42 PM »

Offline Mads Barnkob

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Re: Single Transistor SSTC
« Reply #6 on: July 20, 2017, 08:03:02 PM »
Hey E-Schmok,
I don't suppose you could give the specs of the coil? For some reason the link is dead for me.
Cheers.

https://photos.google.com/photo/AF1QipOa8ZlTwKNZff084GOKP_tGf4THbstu67l4BMru

https://photos.google.com/photo/AF1QipP_a5B4wiZjbARtxAMx1iV-SGK48yC5UUd9PS-h

That did not work either :(

"404. That’s an error. The requested URL was not found on this server. That’s all we know."
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Offline CCX191

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Re: Single Transistor SSTC
« Reply #7 on: July 21, 2017, 02:54:52 PM »
Must be some file placement issue or perhaps the link is not accessible to the public with google photos settings?.

Perhaps putting it at google drive or dropbox might be better :)

Offline Mads Barnkob

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Re: Single Transistor SSTC
« Reply #8 on: July 22, 2017, 04:28:39 PM »
Must be some file placement issue or perhaps the link is not accessible to the public with google photos settings?.

Perhaps putting it at google drive or dropbox might be better :)

It would be best to just upload it as attachment here, then it will stay with the thread forever.
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Offline E-Schmok

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Re: Single Transistor SSTC
« Reply #9 on: July 22, 2017, 11:03:20 PM »
This time it should work  ;)
« Last Edit: July 23, 2017, 12:07:29 AM by E-Schmok »

Offline CCX191

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Re: Single Transistor SSTC
« Reply #10 on: July 26, 2017, 02:33:21 PM »
Nice. It works now.

I was wondering where you got the toroid from, seems pretty neat.

Offline oneKone

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Re: Single Transistor SSTC
« Reply #11 on: July 26, 2017, 04:32:28 PM »
This time it should work  ;)

Cheers for the details.

Offline ldm314

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Re: Single Transistor SSTC
« Reply #12 on: July 27, 2017, 07:51:05 AM »
Amazing results with just a single transistor. What frequency is it running at?

Offline Mads Barnkob

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Re: Single Transistor SSTC
« Reply #13 on: July 27, 2017, 08:11:22 AM »
Great and simple project, many people really like the 12VDC supplied coils as they are not comfortable with mains or does not have it available, good job :)

Did you run into any problems with using the CD40106 as enable, by turning it on/off to the interrupter signal?

I could imagine that it works okay because of the high resonant frequency of the coil (what is it at?), but if the method was used on something like 50 kHz there would be missing or half signals?

If we take a look at the datasheet for the CD40106 there is curves for Transition Time (ns) and Trigger Threshold Voltage (V) that both show much changed behaviour at different supply voltages, and as the interrupter has to also charge/discharge the 100nF decoupling capacitor, the rising edge of the supply could disturb things?

I am purely guessing on a theoretical level here, so just wanted to hear if you had any troubles there?
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Re: Single Transistor SSTC
« Reply #13 on: July 27, 2017, 08:11:22 AM »

 


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