Ward's Build of Bob Boyce's TPU

[HumblePie]

@All,

See SM-10 HVPS's in photo of latest CLK scheme.

Undid the GAL Card CLK'otomy and put on a piggyback Boyce 556 PWM.  10% Film Cap's this time too.  1% in SMD only it seems unless huge bulk order.  DDS 20 in there is last resort as I waiver back to embracing "Just above audio" frequencies, and I recall Dollard Video saying they did not even bother to tune it, and it was an audible frequency they transmitted and tuned with that tunable bridge.   I await my new oscilloscope.

I read this and can see I need 6 channels for closed ended drive soon.   Dirac's Delta Function doc did not make it so clear to me that exact 50% duty-cycle was so unique.   It says at    http://www.allaboutcircuits.com/vol_6/chpt_6/9.html


"You might notice a particular uniqueness to the sound heard through the detector headphones when the potentiometer is in center position (50% duty cycle -- 50% load power), versus a kind of similarity in sound just above or below 50% duty cycle. This is due to the absence or presence of even-numbered harmonics. Any waveform that is symmetrical above and below its centerline, such as a square wave with a 50% duty cycle, contains no even-numbered harmonics, only odd-numbered. If the duty cycle is below or above 50%, the waveform will not exhibit this symmetry, and there will be even-numbered harmonics. The presence of these even-numbered harmonic frequencies can be detected by the human ear, as some of them correspond to octaves of the fundamental frequency and thus "fit" more naturally into the tone scheme. " 

It strikes me that This GAL should be only 3 outputs and more bits in the counter so several harmonics can be tried easily instead of only 4X, just for flexibility, (not to set out on tangent to change Bob's spec's).   The real motivator is that two separate GALs driving only 3 Primes each can be made to run at slightly different frequencies, say 7.8 Hz apart or what ever. SM even tells to study slightly out of phase transformers Bobs says "Just follow SM's clues".  I need to get DOS PALasm working on Vista right after I try it this way with a Scope!    Oh I got all my bookmarks and files permitted recursively BTW.

Edit:  I do need to get out more, but fear getting lost in the threads.  Nothing to fear but fear itself I now read here from Jason months ago: 

http://www.overunity.com/index.php/topic,2873.msg41889.html#msg41889

Also my Magnetic Bias PS with 10Ohm fixed resistor in series with 100 Ohm trimmer.
Ward


Ward

[Bob Boyce]

Looks like your having lots of fun Ward ;-)

Bob

[HumblePie]

@All,

I have forgotten to include frequency shutoff's for my GAL design.  I have spent 15 hours trying to understand how to get PALasm to work in Vista and I really want to give up with emm386 issues.  Admin mode won't support full screen, user mode won't read autoexec or config.sys.  I write CD's from Vista and Win98 can not see the files and the new box has no FDD at all.   DOSbox program I can't figure out how to get these files read either.  That Win98 box has internet problems and is hanging by a thread, so I can not even e-mail the needed files to myself.  I turn away from this before I really waste more time.

All I need is to define two more inputs, 'no2x' and 'no1x', so these frequencies can be added one at a time after 4x, not all on at once!  (maybe I have these orders backwards; I will check later).  Switches down-stream are just not intended here.  I have two switches on the top DIP Switch pack I want to use to control this from the source.  I'll try to borrow another Win98 or XP box for now I think.  The decisions are tough for me.  What ever I do, I'll learn there was an easier way later I'm sure.

My piggyback 556 PWM CLK source did not fire up, so I need to solve that wiring issue too.  I did receive my OWON Scope though and am playing with it now and looking for my wiring error.  As soon as it is found, I'll get back on a PALasm solution.  That may be Lattice Semi's 'ABLE' developer program which I have avoided so far.

Ward

[Bob Boyce]

Hey there Ward. Where are you located?

Bob

[HumblePie]

@Bob,

I'm in Los Gatos, CA, near San Jose, just above Lexington Reservoir and Lupen Nudist Colony, with view of Redwoods, without being under them.  The colony below keeps out development as they own 160 acres below us... no I can't see them.  The private road here is a mere goat trail and keeps city folks at bay.  Contractors keep taking out my retaining wall posts and taking off like they did not notice, but otherwise, it is the best place I have ever been.  I hear you are really way out in the sticks there in Colorado.  Takes me 13 minutes to get down town to services.  We use CA Dept of Forestry for fire, and Sheriff Vs Police.  Everyone here has their own protection, since emergency response times are longer up here.  My 3 dogs are my favorite.  They are very fine canines.

I found Path and Set statements were at fault for my initial problems getting PALasm working on Win98 box, but now I get "integer divide by 0" and other memory issues.  DOS mode says EMM386 is working, I know I will get it working soon.  Bummer is I will have to drive to programmer location during the weekend once ready to burn again.  I do not want to spend more money on a programmer, especially before I get this software working again.  I did buy two 7Ah wet cells though... more next week or so.  I think I'll replace all the car batteries before I spend too much on those small ones.

Found missing wire I was looking for and all but GAL is ready to run with.  I played with new OWON Scope and love it.  I used speaker wire shorted/folded bifilar pancake to pickup the pulses sent to the small chip isolator inductor used in my 9V battery HVPS.  Pickup works great and must let other lead float to pickup at all.  I see the high and low voltage out peaks are from pulses growing at resonance points as I change frequencies.  More pulse width makes them really grow lots and they follow only the negative going edge of the pulse width.  They do not take on the pulse width as I thought they would.  I was surprised I did not see sine resonance at all.  Just sweet spots where pulse amplitude was maximized while maintaining minimum pulse width.  At low frequency, harmonic pulses fill in between driven pulses, but disappear as pulse width is increased.  I'll put up some photos later.  I need to hook Scope to PC before doing this well.  I must go put in some hours else be short of funds for coming holiday days off.  I hope All are well and building this unit also.

I can already see that I must have PWM's x6.  After I try it this way, I will make that card with 4 556's, one for inboard CLK.  I have advised lab partners to leave drivers off and CLK on the Sig Gen Card, and put the PWM's and drivers on 2nd card, and FETs on last card(s).

Edit-I keep seeing your wife improving and getting better suddenly, in my mind.  I hope she is already well and home with you.

Lastly, this is a request to all who have not enjoyed a FREE AD9959 sample.  Get one!  Remember the storey of the Little Red Hen who would not share with those that did not help make bread?  Well I do and have I sent my AD9959 to Jason for his development work on his Stamp based All-in-one pulser.  I had to take a call to explein why I deserved one.  Best storey is that you are a college student working on a development project for a new Function Generator you expect to sell big.  Please take 5 minutes and fill out samples request.  Cheapo e-mail like Bob does not approve of is banned from filling out samples request unless you write the Sales Rep directly.  Do it please!

Ward