Dr Ronald Stiffler SEC technology

[itsu]

Hi Itsu,

I may have sounded a bit unpolite by mentioning quickly the choke coil in the collector while you used the 1 k resistor, sorry for this. I only wanted to indicate the current decrease with the increasing number of paralleled xtals would be more pronounced when a choke coil is in the collector, a resistor limits both the AC and DC currents while a coil limits mainly the AC current.
Anyway, it remains to be figured out why the input DC current reduces and the output RF power increases when the number of xtals is increased in this oscillator.

Gyula

Gyula,

no problem, i am not that easily offended, i was already looking for a 1mH choke with which i can redo the tests.

Could it not be that with more parallel crystals the Q goes up resulting in a higher output (but
smaller peak) and stronger dip in current at resonance?

I will check that tonight with the choke and my SA.

Itsu

[NickZ]

Gyula,

no problem, i am not that easily offended, i was already looking for a 1mH choke with which i can redo the tests.

Could it not be that with more parallel crystals the Q goes up resulting in a higher output (but
smaller peak) and stronger dip in current at resonance?

I will check that tonight with the choke and my SA.

Itsu

   Itsu: 
   I think that is the case...   
   The more current the circuit can output, the amplitude goes drops.
   Using the 1k resistor can hog up a lot of juice. And is the reason that the voltage can be upped. But, my little C1815 still gets hot at 12v though, and too hot at 15v, on up.  But, I'll try the carbon 1k next, as I don't have a 1000uH choke on hand.   
   
   
   Here is an interesting video. Placing a magnet on the coil, and using no current to light a super bright LED bulb.   
   This may have some connection to the Doc's ideas,  maybe.    https://youtu.be/ZKjj4x9zhvs

[mikrovolt]

I call it spike maker another wave shaping circuit. Almost has two states.
The voltage spike has very low current can induce some local resonance.
I liken the spike to a small hammer. efficient at ringing but does not yield much light.
The 50% sine does work, the magnetic component is coherent. Good for increasing brightness.

In a two transistor oscillator where wave shaping is needed we get involved in network
of matching impedance (winding impedance matching transformers) when we add a second stage
is done to accomplish gain. In the bigger picture we look at various systems of feed back loops
and coupling mechanisms that are efficient at transferring power.

When we build the variety using SRF the circuit are sensitive, requiring more patience and finesse.
It does not take much to shift these circuits into a different state so it can be difficult to get them to run at first.

In a three coil system, coils use peak resonance but also SRF. The two coils set parallel the third perpendicular.
Question might be, if coils resonate at a particular frequency what is the SRF frequency good for?

[NickZ]

   Here is a scope shot of my oscillator running on a 7.2MHz crystal, on 15v.  This crystal shows the highest amplitude, but not necessarlly the best wireless effects. The wireless effects on the multi led board is going out about three inches away from the L3.
   
   Gyula: On the oscillator, you will now notice the 68ohm resistor between the 221 choke, and the transistor collector.
Yet, that resistor is not doing much to control the transistor overheating at over 15v.
   A 1k resistor works better towards heat control at higher voltages, but providing for less output to the bulbs. Catch 22.     I'll be going to a higher voltage transistor, next, as the C1815 seams to be the bottle neck.

[gyulasun]

...   
   Here is an interesting video. Placing a magnet on the coil, and using no current to light a super bright LED bulb.   
   This may have some connection to the Doc's ideas,  maybe.    https://youtu.be/ZKjj4x9zhvs

Nick,

As I watch the video you gave the link to, my impression is the magnet (when he approaches it to the reed coil) just
stops the oscillator, no? 
When the magnet is sitting on the table away from the circuit, the oscillator starts as he cranks up input voltage to
around 2.1 V and then he sets it to 3.2 V to have a nice brightness (through the magnifying lense top of the LED)
at 2.15 mA input current, the permanent magnet has no role during this time.
Then he approaches the magnet to the reed switch and the strong field stops the mechanically oscillating reed
contacts (quasi 'glued' them together) which so far interrupted the input current and the reed coil resistance took
the 11.9 mA current without interruption. The reed contacts were the Normally Closed type he used and the magnetic
field of the coil at any switch-on time made them OFF.
Would like to show you another oscillator from him, see here:  https://www.youtube.com/watch?v=I24nDi_q-EU 
This setup does need the close presence of a permanent magnet to start and maintain oscillations. Here he uses
the Normally Off contacts of the reed switch and the presence of the weak and static permanent magnet field is
which forces the contacts to close the battery circuit (schematic is in the upper right corner at the ened of the video).
And when the input current suddenly creates its field in the coil, it should be stronger than the weak static field and
the contacts open,  so coil flux collapses and the static field can close the contacts again.
Gyula