TP600 - TPU PULSER

[turbo]

the bemf can be extracted by using diodes and then fed/redirect into the same bifilar coil only the other winding, so it cancels itself out ,i have already tried that and you can also capture the bemf in capacitors etc..

Marco.

[Peterae]

Hi Darren

I see you are doing a Stirling job over here.
The DDS would be very nice but inherently the cost of building would climb and take some time to get the software up and running, until we have a clearer vision of the exact function of the control we require I think it would be best to keep design time and build costs down to a minimum.
The TP600 should be able to keep most experiments on track and using CMOS it's difficult to get much cheaper.
I am a bit of a module fan myself and tent to build modules that plug together to create the required circuit.
Your above circuit, I would build each oscillator as one small board that plugs into the sync board which plugs into the fet driver and fet output board, that way if the oscillator or the sync board needs to be modified and redesigned for other purposes we just need to rebuild a small board instead of the whole board.
Also using photo etching to make the PCB's would mean you only need to cad the oscillator once and build 3 times as a module.
This method has been very handy with my own board as I can unplug a pic processor and plug a 555 timer based oscillator directly in place, and now thanks to your great simple oscillator circuit I can plug one of those in for a complete set of frequency ranges when I get round to cad-ing it up to a PCB.

Peter

[Earl]

@Darren

good work, keep it up.
I believe when SM refered to a pure frequency, he meant low jitter.  That means a quartz crystal reference somewhere.  Whether PLL, dividers, DDS doesn't probably matter so much as long as jitter is low.

This rules out R/C oscillators of any kind, should jitter be of extreme importance.

Low jitter also means short leads, lots of low-inductance by-pass capacitors, etc.
GHz layout, not wires all over the table.

@All,

take a look at my latest ideas at:

Fastet, narrowest pulser possible
http://www.overunity.com/index.php/topic,2582.msg41929.html#msg41929

Rat Race version 2
http://www.overunity.com/index.php/topic,2582.msg41932.html#msg41932

Rat Race version 1
http://www.overunity.com/index.php/topic,2582.msg38506.html#msg38506

Regards, Earl

[turbo]

the transistor setup will generate the unwanted harmonics all over the place, that is why the tubes work much better and crystals do not generate these unwanted harmonics they are stable the only thing which alters their frequency is, temperature.
when using transistors we may also need to use pre amp like tools to reach proper feedback like Steven said ,tubes are much diffrent.
M.

[BEP]

To answer a PM request I offer the following: