Lords of the Ring

[giantkiller]

The DAC from futurlec.com goes upto 222k. The ucontrols wil allow a first freq to be set which will be variable. Then 2 more freqs above and below with a % variable width window, position adjustable also. So one could sweep any one of the freqs and have the variable window sweep with it. The wider the window the safer. Control the window and you control the wave summation on the coil. That is the pc interface part that could control some of the dynamics up front and lead to a control interface afterward for standard operation to build any type of the 1000 ways coils. Any freqs or phasing possible.

@bolt,
Great posts!

--giantkiller. Parts on the way. 10mips @ 12bit @ 222khz

[bolt]

giantkiller take a look at this.  Download it and keep it in your notes file. Its a wide band video op amp. It may prove cost effective in future designs rather than using powerfet PA. The video amp has excellent rating DC to 400 Mhz. Certainly up to 100 meg it should well exceed anything we want it to do. The output is designed to run into 50/75 ohms and thats the reason SM is using a torrid balun to provide the correct impedance from the sig gen to collector.  The other nice thing about this is 4 channels on one chip LMH6722 and there is a TTL like shut down pin which will start and stop extremely fast. You will like this it has digital input gain selector also which will work great off your little board.

For now though carry on with the class A amp until we can achieve the nasty over used term "proof of concept"

http://cache.national.com/ds/LM/LMH6714.pdf

Why SM may need to use balun? This could also be useful to provide the correct impedance of  the sig output to collector. The sig gen will be very low impedance and unbalanced even the mostfet PA stage is designed to run into very low impedance..few ohms. The collector coil will appear as several hundred ohms balanced. We know that a twisted pair has a 300 ohm impedance same as EDIT folded dipole (open unbalanced dipoles usually low impedance 50 or 75 ohm) and the collector coil could be as high. If the sig input is mismatched then we cannot transfer enough useful signal in to the collector. While writing this it certainly occurred to me the collector is a magnetic dipole!  LOL oh heck it gets better. The two collector coils ARE balanced and fed into the balun. This means energy must be transferring between top to bottom and back again. Read about how the MEG is supposed to work and note the similarities.

http://www.pd7bz.com/radioprogs/manuals/balun_transformer.htm

You see now that the theory that ticks the right boxes to make this work is far more involved then whacking pulses and see what comes out the other side:)  What we have on our side is that the TPU is real and already exists.

[acerzw]

GK,

PDF on balun transformer construction:

http://www.oselectronics.com/downloads/Broadband%20Transformers.pdf

Acerzw

[acerzw]

@GK, Bolt

Seems the TPU theory is complete. I believe I can see a radical simplification 

Acerzw, ex-researcher > builder! 

(will post design if works, fingers crossed, and not hit by a bolt, ETA 1-2 wks )

[giantkiller]

@Bolt,
I'm on it. Will start formulating and designing that in for the future. Plugh -n- play, The cave will not be closing any time too soon.

@all,
Alot going on at the software bench too.
Yes, you did notice a shift in my work. The analog side has to be covered also. I am gaining more interfaces for output. And when this stage get completed I will have one sweet environment.

--giantkiller. More toys!