Dr Ronald Stiffler SEC technology

[erfandl]

It was given before, but here's my version of the Simple Crystal Oscillator. I used a BC337-25 transistor, also tested it with a VHF transistor, MPSH10, which also worked well but didn't have the amplitude of the 337. I think just about any NPN would work in this circuit.

The original circuit made a signal but didn't have the ability to really drive anything. I added a 74c14 hex Schmitt trigger inverter and ran the SCO's output through 3 of the inverter stages, which helped to square up the signal and make it capable of actually driving some small load (like a mosfet driver or a transistor). The inverter is pretty slow though so this version only works best for lower frequencies. I also added some bulk capacitance at the power entry point, which also helped to clean up the waveforms, both before and after the Schmitt trigger inverter stages.

Yellow is SCO output before Schmitt trigger stages, blue is after.  Input is about 6.5 volts from a regulated PSU.

thanks for reply. what the number of quartz ? is output must be shorted together ?
thanks

[TinselKoala]

What do you mean the the 74 series chip is slow ?  how slow here i have a CMOS chip CD4060 with a 13.4Mhz chip it's fast I found this
in looking for 432hz multiples up to 1.3 mhz region, even a 4011 will clap away at 15mhz easy all with a 8volt power rail, you might not be so lucky
with if using older stock.

This old bulb of Nick's they remind me of some of the old junk that worked of DC from years a go now you can get them in hard ware stores allover.
I was called a Beretta voltage dropper. I had a knowledgeable grandfather if any ones asking.



AG

That scopeshot is "scope abuse". Your signal is so clipped that the risetime measurement is likely bogus. Please repeat the test with the entire signal on the screen vertically, not clipped.
The DS1054Z does not respond well when its input preamps are overloaded.

[TinselKoala]

thanks for reply. what the number of quartz ?

For that test I used a 3.579545 MHz crystal. I have tested the circuit at up to over 18 MHz.

is output must be shorted together ?thanks

What? I don't understand what you mean. No, the output is not shorted together, what makes you think that?

[NickZ]

   AG:   Well, it's not an old bulb , it's an LED. 40 watt equivalent. Gives the warm golden white light like the older incandescent bulbs. I love that type of light. It's not all sparkly, like normal LEDs. I just wish that it would light it off of capacitance. But it does light well off of just a one wire transfer. So it might work for the diode loop. We'll see...
As far as which schematic to build up for the crystal oscillator. I still have not decided. But I would like to be able to switch the different crystals, for varying the frequency.   There are several videos on YouTube about crystal oscillators. Yet, they have to be able to use a 24v input to the oscillator input, to drive a FET, or transistor, and be able to light some LEDs, and neon bulbs, brightly. Like I'm doing with my kacher circuit, already. Which can light even a 100w bulb, partially.

[TinselKoala]

What do you mean the the 74 series chip is slow ?  how slow here i have a CMOS chip CD4060 with a 13.4Mhz chip it's fast I found this
in looking for 432hz multiples up to 1.3 mhz region, even a 4011 will clap away at 15mhz easy all with a 8volt power rail, you might not be so lucky
with if using older stock.

This old bulb of Nick's they remind me of some of the old junk that worked of DC from years a go now you can get them in hard ware stores allover.
I was called a Beretta voltage dropper. I had a knowledgeable grandfather if any ones asking.



AG

I used a 74C14 which is not fast enough for 18 MHz . I might have some 74AC14 chips somewhere, which have a much faster risetime (otoo 10 ns) which may allow operation at higher frequencies. Pain in butt to change the chip though because of the way I mounted it. Oh well.