Ward's Build of Bob Boyce's TPU

[HumblePie]

Well I was away for a few days, so I'm still at it.  I need a nice magnifying lamp I do not have.

The two switches left after 3 Freq' range Cap's for oscillator will select four states I have not decided on.  I'm thinking:
3 Primes / 6 Primes fire shift option 1 / 6 Primes fire shift option 2 / Pulse all 6 same.  I'll add equations to do this.  Also I will fix OE polarity flaw because I do not like that it can float high and enable out's.  Jumper block will allow substituting an external CLK source like DDS 20.  External kill switch will tie to /oe.   I have decided to put Voltage Sens' feedback, HV control voltage, and temperature shutdowns on a different card.

Ward

[gn0stik]

I have to say, ward, excellent documentation. And nice work too. You are making excellent progress.

[MarkSnoswell]

Hi Ward,
   Wow -- exelent job. I havn't been keeping up with this -- sorry I missed so much activity now.

cheers

mark.

[HumblePie]

@All,

Thank you all for your encouragement.  I have aquired the SMD Resistors for isolation and Ceramic Capacitors to try instead of discretes I also have, however, I am ill equip'd to attempt soldering these.  I will use discretes for isolation and chip decoupling; next to other chips and right on top of Drivers as they are critical.  I should have maybe put Driver on other small card so clock-gen' would be usable with open or closed-ended Primary drive cards with PWM there too.

I see possible problem where tri-state works with Schmit Triggers, but regular TTL inverters floats high... preventiing regular '04 inverter being substituted for the 74ACT14's.  Tri-state would turn on Drivers in that config'.  So, I will wire Kill Switch to CLR already there to hold all Prim' CLK's low to accomidate this '04 option. 

I wired this card so each Channel goes through two gates on each chip.  Just because wires were more segregated this way.  If I had wired to use one from each inverter, a DIP component carrier could be jumpered and substituted for the first inverter if Inverting Driver's were desired... then no GAL change would be needed to drive them with same 'fixed' pulse width.  I do not see any way to make a single GAL define both polarity pulses.

Ward

[HumblePie]

@All,
New GAL's posted here.  OE signal is fixed so Low allows outputs and High engages high-impedence out's.  The Hex421x4 file is positive pulse (could'a called it 'p4, but sounded like 4 Prim's that way), Hex421n4 is negative pulse.  Each is now 4 state control for the two extra switches not used for freq range Cap.  You can also just jumper out one inverting Schmit chips as alternative to negative pulse GAL if you wire with this in mind.

00  - 6 Prim's, offset firing orbers 'A' advance wrt 'B' one 12X CLK.
01  - 6 Prim's, offset firing orbers 'A' delayed wrt 'B' two 12X CLK's.
10  - Pulse all 6 same at 2X CLK
11  - Prime Set 'B' only, hold Prime set 'A' always low (high for neg pulse GAL)

I got F1 mixed up with 1X and glued the wrong Trimmer Pot's recessed.  These were to be the F1 (which is 4X).  It is 4X that is never phased.  If I ever want to DLY 4X, I will remove the jumper wire that bypasses these 1X RC DLY's.  I could not swizzle the signals around with code to solve the Trimmer placement per # of available Boolean Product Terms for certain output pins (comments fixed where there were errors).

I cannot find Camera Cable right now, so I will post photos of card wired inside ring in a day or two.

BTW - The Prim's do all match 100% IF I short out the Secondary, Else middle two segments' F'-Res' increases by 15% above the others.

And that cheesey 1X Scope Probe I was using was capacitive and brought the 3MHz (or so) real resonance points down to 780KHz & 900KHz (middle seg's).  I mention because I will hand tune from above the ring and hands are capacitive, so I'll keep that in mind. 

I'm only showing the negative pulse simulation and only the new features (pulsed all same and just 3 pulsed).  See Reply #1 for original posts showing the staggered firing orders.

I'm working on high voltage source now using Coil, Cap, and 555.  I have 22M Ohms on a Bridge with Choke, but my inverter is dead so will be cheaper to biuld it discrete.  My SM-10 1000VDC variable PS will arrive Dec 1st they say.  This one is equiped for feedback control using 0 to +5VDC in.

Ward