I beg to differ.
The Eymorgs from Sigma Draconis (6th planet) had ion drive. Which of course
was far more advanced than mere warp drive and impulse power(according to Scotty).
I had the hots for Kara of course.
Well, at least when she was smart....um, no wait, as I think, intelligence wouldn't have mattered.
Edit: kinda like Billy Joe, Betty Joe, and Bobby Joe.
Jn
A great TOS Spock's Brain reference...there were indeed some 'interesting' aliens on that show...When I was 10 watching them made me feel funny like when I climbed the rope in Gym class...(thank you Dana Carvey)...
Howie
Hi John,
It's an HP ? what?
Other than that, it's nice to see you have a real working bench with real mess on it. There is a thread here, "What's on your bench" I think. You might get some ideas from some other people's benches as well.
- Chris
It looks like you have more gear than can be seen. What instrument are you giving the finger to?
It's an HP ? what?Other than that, it's nice to see you have a real working bench with real mess on it. There is a thread here, "What's on your bench" I think. You might get some ideas from some other people's benches as well.
- Chris
I'm using Eneloop 1900mah 1.2volt x 8x2 batteries run as two packs in parallel as 9volts for the eq, then 1.2volt x 10x2 batteries run as two packs in parallel for the valve buffered preamp. The poweramp is powered by two YUASA 12volt 10amp cyclic batteries run in series to give 24volts, I think they are SLA, but I'm not in the workshop right now. The whole rig is massively under-run.
Most of time it sounds great, but on complex 'wall of noise' type rock music it loses some lucidity, although the buffering effect of the driver's alnico magnet seems to make it somehow more musical.
Right, NiMh batteries & SLAs
I would suspect the SLAs are what is giving you some congestion on complex music - they just aren't fast enough
I would try the LiFePO4 driving the poweramp - 3.3V * 7 = 24V
IIRC, many of the acoustic neuro researchers were using a zero crossing model for human hearing.
Jn
Thank you for that real 'need to know' information, I have suspected this for awhile now.
I hear what you say about the LifePO4, but would some some form of capacitance voltage buffer be effective? Just thinking out loud about costs vs effectiveness.
Sorry, I have but a lay understanding of electronics.
Oversimplification, but a good point. I would add that signal levels at the input are the same (carts, microphones, etc.) for both technologies but the linear input/output voltage range on tubes is large (sometimes huge) compared to SS.
Some papers I had researched used a zero crossing model for localization. It seemed far too simplistic for a complex musical soundfield where assymetrical lower frequency content would provide a different DC level to higher frequencies, and then mess up the ITD timing. Unless of course the coils do a progressive high pass with distance.
I suspect there is far more processing going on between the ears than just zero crossing timing.
Well, except for Billy Joe, Betty Joe and Bobby Joe...
I'm not at work, I'll see if I can find the papers next week.
Jn
The speed of current delivery is determined by the internal impedance - LiFePO4s are down at ~8mOhm
Supercapacitos may well substitute for these batteries - up around 350Farads about equivalent or lower impedance but they are limited to 2.7V so you would need 10 of them & way of balancing them during charging - of course you would also need to balance the batteries.
IanCanada here is developing a battery or supercap PS pack - don't know what prices it will be?
Maybe you could parallel a number of electro caps to achieve something similar?
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You need to be clearer on this my series parallel 880AH solar battery backup was capable of completely vaporizing the end off a screwdriver instantaneously (ask me how I know).
Define speed in this context. I see you commented, resistance alone is not enough to engage time into an analysis.
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Sure, it's a simplification to make a point
Have you worked on design of high voltage op-amps, Scott - anything to relate?
I'm talking about the ability of the PS to be unconditionally stable to deliver all the current draw requirements in a timely manner while keeping the ground reference rock solid - easy to achieve with battery or Supercaps - their very low impedance across a very wide frequency range seems to have something to do with this?
It is reported everywhere that LiFePo4 batteries are used that active regulators on the output of these batteries disimproves the sound (when driving audio devices) but this has not been measured so I doubt we can use existing measurements to demonstrate/analyze this?
Only special purpose extremely high crest factor ones. xDSL drivers myself but I consulted on some envelope tracking amps for cell phone base stations and a 200V pulser for ultra sound. That was an interesting problem, the same piezo element that made the pulse at 200V had to receive the nV level signal back within msec (human tissue has a very large attenuation at MHz).
Plenty of information if you do a search. I general this is a complex (as usual) problem that does not reduce to a simple one dimensional answer. The current on demand behavior depends on a lot of things like exact composition and design (not all SLA batteries are the same), the diffusion of electrolyte on discharge, temperature, time, etc. a multi-disciplined problem.
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