Dr Ronald Stiffler SEC technology

[gyulasun]

....
I just tried the test circuit from the above post and it still says 9.02MHz !
It must be a very wonky crystal, or, it could be viewed as a highly exacting and tough 9MHz source.
Quick vid here for you Gyula, 37 seconds, showing the test.
https://www.youtube.com/watch?v=jHXouxpKkxw

Hi Slider,

Thanks for the video. The test shown by the manufacturer I think tries to mimic a TTL load for their oscillator output, to characterize somehow their output waveform rise and fall times, that is all.
There surely is a problem internal to your encased oscillator if the 27 MHz is stamped on it as the photo shows TK found, then the 9 MHz should not dominate at the output, hence you have a 9 MHz oscillator. The wave form your scope shows has far worse rise and fall times, not even comparable to their stated data on those.

Perhaps, just perhaps,  if you wish to make LED tests at 27 MHz, you could make an air core coil for 27 MHz, would look like a Tesla secondary. Its bottom wire would go to the negative rail and the oscillator output would be connected via a series capacitor to a 2 or 3 turn tap from the bottom, the top end would be floating. Like a step up auto transformer. 
Of course this tuning would involve many trials and sweat to arrive at the coil's 27 MHz resonance and the result is also questionable, LED wise at 27 MHz. For an estimate on coil size and turns, online calculator may help in that to bring  sizes within ballpark range. If you need I could figure out something. 

Gyula

[gyulasun]

Hi Nick,
The price is too high for those crystals if you have to buy 200 pieces in that offer.  Yes the frequency is good I think.  I also think these offers at ebay are also good and the frequencies are within ballpark (I made a random search):
https://www.ebay.com/itm/253056332398     or   https://www.ebay.com/itm/362257415906 

The designation "oscillator" in the title of the offers is only a marketing method, of course,  you would need to build a 1 transistor circuit to make any of such crystals oscillate at their stemped on frequency.
Gyula
 

[Slider2732]

Gyula - good idea with the Slayer type of setup. But would such a thing actually switch at that speed, their normal free running characteristics put them at around 2 MHz. Will try it anyway

Nick - the 4 pin type is easiest to work with. The 2 pin types like that one are correct, but need a bit of circuitry. Usually 30pF x2 and an op-amp etc. I think that's the draw of these 4 pin types, having the needed hardware built in.

Speaking of which, it's been an interesting foray so far within the old boards here. Do I really want to desolder a 46.6MHz 4 pin from an original Soundblaster 16 ISA card ? 
Same thing for the various ones found on arcade boards, such as Streeetfighter II and Golden Tee Golf.   
But, have found a 24MHz and a 30MHz on the boards from a DEC DecMate from 1981. The crystals could be put back in, so I think i'll desolder those. 
No luck yet on the 13.5MHz area though.

[gyulasun]

Well, it is not likely you would find the needed xtal, you know Murphy...

What you show on the boards look like oscillators running at 5V I guess.
https://www.ntt-electronics.com/en/nel-c/company/index.html     no info yet on their products

[NickZ]

Well, it is not likely you would find the needed xtal, you know Murphy...

What you show on the boards look like oscillators running at 5V I guess.
https://www.ntt-electronics.com/en/nel-c/company/index.html     no info yet on their products

Slider, can't you just order a few of the right 13.5MHz ones, might take a few days to get them, but you'd have them.   Otherwise it's like batting in the dark.   You need to tune your coil (or coils), as well. Like Gyula has mentioned. Other wise the frequency will be more related to the coils that you use, instead what the oscillator frequency provides. Which brings me, again,  to just what coils, and frequencies we need to use.
   I see that a well tuned system needs no ferrite to tune with, adding ferrite to the core, just messes up a properly tuned circuit loop. As does adding any type of ground line. Adding a ground line should Kill the resonance, if it's all well, and in tune.