ECL: Why'd they use negative voltages?
in [Design]
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From: Joerg on 7 Jun 2010 21:14 D Yuniskis wrote: > Hi Joel, > > Joel Koltner wrote: >> "D Yuniskis" <not.going.to.be(a)seen.com> wrote in message >> news:huk3tl$224$1(a)speranza.aioe.org... >>> Dunno. But, it was fast and ate gobs of power. In the >>> mid 70's I worked on a processor (i.e., what nowadays >>> would be a CPU "chip") that drew 100A (MECL III and 10K). >>> "Bus bars" for power were 3/4" square copper shafts. >> >> *Most* impressive. :-) > > No. Insane. > >>> If you "slipped" when pulling/installing a chip, the legs >>> would vaporize before the power supply would even hiccup. >>> (needless to say, you removed all jewelry -- belt buckles, >>> eye glasses, rings, etc. -- when working on it) >> >> --> http://sound.westhost.com/project117.htm (a 1500W audio amplifier, >> "It is capable of destroying any loudspeaker connected to it, >> regardless of claimed power rating.") :-) > Man, that even dwarfs the tube amp I build in school. It could push north of a kilowatt but not that high. Mostly because that's when the circuit breaker popped ... > Yikes! I used to push 600W when I was in school but never > actually *listened* at that level! :> > We did listen. Until a car with a blue hump on top and a guy in uniform inside showed up. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: D Yuniskis on 7 Jun 2010 21:18 Hi Joerg, Joerg wrote: >>>> If you "slipped" when pulling/installing a chip, the legs >>>> would vaporize before the power supply would even hiccup. >>>> (needless to say, you removed all jewelry -- belt buckles, >>>> eye glasses, rings, etc. -- when working on it) >>> >>> --> http://sound.westhost.com/project117.htm (a 1500W audio >>> amplifier, "It is capable of destroying any loudspeaker connected to >>> it, regardless of claimed power rating.") :-) > > Man, that even dwarfs the tube amp I build in school. It could push > north of a kilowatt but not that high. Mostly because that's when the > circuit breaker popped ... > >> Yikes! I used to push 600W when I was in school but never >> actually *listened* at that level! :> > > We did listen. Until a car with a blue hump on top and a guy in uniform > inside showed up. We would have fun "broadcasting" bursts of 2600Hz :>
From: Joel Koltner on 7 Jun 2010 21:17 "Joerg" <invalid(a)invalid.invalid> wrote in message news:875jfpFtf6U1(a)mid.individual.net... > Joel Koltner wrote: >> Seems like a belt is an awfully inexpensive addition for the flexibility it >> provide in terms of being able to locate and size your generator >> independently of the engine itself, to a large extent! > But it can snap, and it usually does so on a Saturday night in the boonies. > About 30 miles past the sign that read "No services next 60 miles". Sez > Murphy :-) Oh, alright -- I suppose the likelihood of enough teeth breaking off the generator's drive gear so as to completely disable it is pretty much nil... Do you currently carry about one of those "emergency" replacement belts... just in case? (E.g., http://www.amazon.com/V-320-EMERGENCY-FAN-BELT/dp/B000KKN8UY ) I've never had a belt fail in my entire life, although I have had a radiator hose spring a leak while in the road... and then on another car the (plastic) radiator itself crack... ---Joel
From: Jim Thompson on 7 Jun 2010 21:20 On Mon, 07 Jun 2010 17:47:12 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Mon, 07 Jun 2010 19:43:49 -0500, "krw(a)att.bizzzzzzzzzzzz" ><krw(a)att.bizzzzzzzzzzzz> wrote: > >>On Mon, 7 Jun 2010 17:35:05 -0700, "Joel Koltner" >><zapwireDASHgroups(a)yahoo.com> wrote: >> >>><krw(a)att.bizzzzzzzzzzzz> wrote in message >>>news:4e3r065vr383q2hc9fiuhre2mu9opopbai(a)4ax.com... >>>>>And why 5.2V anyway? (Granted, 5.2V is no stranger than 6.3V filament >>>>>transformers, I suppose...) >>>> >>>> Stack up the voltages (don't forget the AND gate). >>> >>>Purportedly it'll run down to around VCC-VEE = 3V and up to about 8V before >>>you start seeing massive performance differences. 5.2V is certainly pretty >>>close to the center of those two... hmm... I wouldn't be surprised if that's >>>how they came upon it! >> >>No, Jim had the reason above. Try an AND gate at 3V. ;-) > >MC10EP05. > >John That's NOT original-crispy ECL :-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | The only thing bipartisan in this country is hypocrisy
From: John Larkin on 7 Jun 2010 21:21
On Mon, 07 Jun 2010 19:54:48 -0500, "krw(a)att.bizzzzzzzzzzzz" <krw(a)att.bizzzzzzzzzzzz> wrote: >On Mon, 07 Jun 2010 17:47:12 -0700, John Larkin ><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >>On Mon, 07 Jun 2010 19:43:49 -0500, "krw(a)att.bizzzzzzzzzzzz" >><krw(a)att.bizzzzzzzzzzzz> wrote: >> >>>On Mon, 7 Jun 2010 17:35:05 -0700, "Joel Koltner" >>><zapwireDASHgroups(a)yahoo.com> wrote: >>> >>>><krw(a)att.bizzzzzzzzzzzz> wrote in message >>>>news:4e3r065vr383q2hc9fiuhre2mu9opopbai(a)4ax.com... >>>>>>And why 5.2V anyway? (Granted, 5.2V is no stranger than 6.3V filament >>>>>>transformers, I suppose...) >>>>> >>>>> Stack up the voltages (don't forget the AND gate). >>>> >>>>Purportedly it'll run down to around VCC-VEE = 3V and up to about 8V before >>>>you start seeing massive performance differences. 5.2V is certainly pretty >>>>close to the center of those two... hmm... I wouldn't be surprised if that's >>>>how they came upon it! >>> >>>No, Jim had the reason above. Try an AND gate at 3V. ;-) >> >>MC10EP05. >> >Got a schematic? People used to publish schematics of their chips, or at least functional schematics. No more. The EPs are SiGe, I think. John |