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Overunity Machines Forum



Dr Ronald Stiffler SEC technology

Started by antimony, April 25, 2017, 09:09:27 AM

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0 Members and 18 Guests are viewing this topic.

Ed morbus

Your welcom Nick

Have some one information for the coil or how to

itsu


Got the BF869 as oscillator running.
I removed the 5K trimmer pot and replaced the 100K fixed base resistor by a 50K trimmer pot and added a 47pF cap across collector/emitter.
The 50K pot was set to 18.5K when the below screenshot was taken.

So we have 12.5V from the battery and 18.5K base resistor meaning we have 0.67mA running in the base
Times 50 as hFE so we have 33.7mA quiescent collector current

12,5V / 18.5K = 0.67mA   x 50 = 33.7mA

But the signals are nowhere near what i got with the BC337 and i see an elevated collector signal (blue trace, yellow is output signal behind the 100nF cap).

Itsu

Lidmotor

All---Another crystal circuit replication popped up on YouTube done by channel called 'JB-N107Lab'.
   There is no dialogue but he shows that he is getting the job done.  He is using a very interesting compound AV plug (Stiffler Loop) as the load.
  He is also finding that 13MHz is not critical and has done a series of videos with the circuit.

Here is one of them:
https://www.youtube.com/watch?v=nqxBg8-pzPA

erfandl----  I ordered some of those little RFID 13.56MHz antennas but they have not arrived yet.  I was glad to see that you got yours to work on the circuit.

Ed----The coils (L3 I guess we are calling it) people are using are based on Dr. Stiffler's SEC 18 L3 coil.  If you look back a few pages you will find more discussion on that.

Mikrovolt---Thanks for the info on the frequencies and harmonics.  That really helped me understand what I am seeing.  I have been doing pulse motor testing using a single wire feed off my signal generator and it has been confusing.  I got the motor to run on some strange frequencies and it might be a harmonics situation.

Nick -- Keep at it.  As I recall you live in Costa Rica and I can imagine how hard it is to get parts there.  All the stores near me that sold electronics parts have vanished and I have to order parts online or innovate circuits with stuff I have on hand.  I feel your pain. 

---Lidmotor

Ed morbus

Thanks Lidmotor i want more information for L1

gyulasun

Hi Itsu,

Okay, good! I assume you checked the 33-34 mA quiescent collector current when the crystal is removed? It would confirm the assumption of hFE being really around 50 (I took it from data sheet, it said as minimum 50).

The elevated collector waveform indicates that the AC impedance (i.e. that of the 4 turn tap) across which the hFE can amplify is low. In fact, it is the hFE which is low versus that of a BC337-40 but now you surely have less than maybe 100?.

Ideally the AC collector voltage should swing between zero and about twice the supply voltage. (I have not mentioned this yet.) To increase AC impedance for the collector and have higher gain as an amplifier, you would need to make taps at 5 and 6 and maybe at 7 turns and see the collector waveform and also the full AC peak to peak across the trimmer capacitor.  When the tap is moved higher, the resonant voltage step up decreases but maybe the gain by the higher AC impedance could compensate for it in a certain degree.

The probe self capacitance is added via the 100 nF to the 47 pF cap you placed across the collector-emitter, of course. I wonder what is the tank trimmer cap capacitance now? Can you easily tune it to maximum tank voltage?  (The probe capacitance is also across the tap, not only across the collector-emitter.)
Thanks,  Gyula