Author Topic: TOSLINK simple SSTC driver  (Read 514 times)

Offline LoFoTroFo

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TOSLINK simple SSTC driver
« on: August 27, 2021, 10:32:02 PM »
Hi everybody. I'm planning to create a simple driver circuit for a SSTC or even a DRSSTC using TOSLINK as optical input. I have some experience with tesla coils, i have used the famous UD drivers and some chinese ones too, but i want to make a more budget friendly one, that still uses optical input.

My design is based on E-Schmoks circuit https://highvoltageforum.net/index.php?topic=65.0

My question is, could this driver design work ? I will attach a photo below.

Offline TMaxElectronics

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Re: TOSLINK simple SSTC driver
« Reply #1 on: August 28, 2021, 12:41:30 AM »
Using toslink as the control interface is what I used on my very first few coils :D
Never got it to work with the off the shelf receivers though, since they have some sort of signal conditioning that expects dc-less signals (at least if I remember correctly). I ended up taking the receiver apart and replacing the opto-ic inside it with just a photodiode, but that was pretty janky so I switched to HFBRs.

I'm also curious about the ne555 after the opto receiver. Do you want to use that for adjusting the pulse width?
If so I would recommend against it, since it's easier to change the pulse width on the interrupter you're using instead of changing out components in the coil.

Also, why not use the if-96e style fiberoptics? They are similarly priced (even a little bit cheaper) and will not touch your signal at all.

Offline LoFoTroFo

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Re: TOSLINK simple SSTC driver
« Reply #2 on: August 28, 2021, 09:53:54 AM »

I'm also curious about the ne555 after the opto receiver. Do you want to use that for adjusting the pulse width?
If so I would recommend against it, since it's easier to change the pulse width on the interrupter you're using instead of changing out components in the coil.

No i don't want to use the NE555 after the opto for adjusting the pulse width, i'm planning to adjust it externally.

Also, why not use the if-96e style fiberoptics? They are similarly priced (even a little bit cheaper) and will not touch your signal at all.

Here where i live it's really hard to get the IF-96E style optic recievers. So for me it's a lot easier to find/use alternatives. Back in 2017 i have tried to use toslink in my little coil with little to no success. The major problem was, that even if it worked, after a while my toslink reciever suddenly died.

Offline davekni

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Re: TOSLINK simple SSTC driver
« Reply #3 on: August 28, 2021, 07:19:22 PM »
Quote
Here where i live it's really hard to get the IF-96E style optic recievers. So for me it's a lot easier to find/use alternatives. Back in 2017 i have tried to use toslink in my little coil with little to no success. The major problem was, that even if it worked, after a while my toslink reciever suddenly died.
Yes, even here in USA the IF-9* opto parts are marginally available.  I do use those, as well as sometimes the same 1mm-core-diameter fiber glued into holes drilled in 5mm LEDs and photo-diodes or photo-transistors, as in the LED end of this fiber-scope example:
https://highvoltageforum.net/index.php?topic=1263.msg9259#msg9259

When I first purchased some toslink receivers, I tested them with DC and decided they were all bad parts.  Later after reading on this forum I realized they were AC-coupled.  They all work fine with AC signals, I think the spec is 100kHz minimum.  Occasionally I did see output transitions with stepped DC input.  My guess is that your parts didn't die.  Instead they sometimes by luck worked a bit and more often not.

I did fine one use for a toslink receiver.  In my reverse-chirp DRSSTC drive experiment, I use a single fiber to control three outputs using FM, three discrete frequencies, plus a fourth idle frequency.  (Idle frequency is needed because the toslink receivers sometimes self-oscillate with no light input.  So, dark is not an option between bursts of my three desired frequencies.)
David Knierim

Offline TMaxElectronics

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Re: TOSLINK simple SSTC driver
« Reply #4 on: August 28, 2021, 08:36:15 PM »
Quote
Yes, even here in USA the IF-9* opto parts are marginally available.
Are you sure? I just checked and those parts seem to have been spared by the parts shortage. Digikey has almost 10000 IF-E96E transmitters and 2500 IF-D91B photodiode receivers in stock.
But the LEDs with holed drilled in the front is an interesting approach that seems to be used even professionally. Here's the same idea applied in the flashlamp driver for an old NdYag laser (in which the cost for a transmitter probably wasn't an issue :P).


Quote
Occasionally I did see output transitions with stepped DC input.
If I remember correctly the Toslink parts I got accepted audio interrupter signals well, but after not getting a transition after 10ms or so they would start oscillating on their own. But I may be wrong, back then I barely knew how to use an oscilloscope :)

If you really want to use toslink you can buy the receiver you listed, open the back of it and replace the original IC with a right angle photodiode, then you can use the normal receiving circuitry from any other coil.

Offline davekni

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Re: TOSLINK simple SSTC driver
« Reply #5 on: August 28, 2021, 08:58:16 PM »
Quote
Are you sure? I just checked and those parts seem to have been spared by the parts shortage. Digikey has almost 10000 IF-E96E transmitters and 2500 IF-D91B photodiode receivers in stock.
The part I use most often is a phototransistor receiver, IF-D92.  That one shows as "on-order" at Digikey, and doesn't show up at any other distributors per oemstrade.com.
David Knierim

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Re: TOSLINK simple SSTC driver
« Reply #5 on: August 28, 2021, 08:58:16 PM »

 


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