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Kevin Neilson
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re: Pacemaker was born of a blackout
Kevin Neilson   12/14/2012 6:09:24 AM
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Ha! The dude got rich off what seems to be a 555 timer! I think he got the schematic out of a Forrest Mims notebook. I like the extensive testing they did those days. The dude wires up a 555 in a metal box and the next day they hook it up to a girl in the hospital.

DaveR1234
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re: Pacemaker was born of a blackout
DaveR1234   10/31/2014 11:30:34 AM
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Hey Dude, 555s were in short supply in 1957.

prabhakar_deosthali
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re: Pacemaker was born of a blackout
prabhakar_deosthali   10/31/2014 11:42:32 AM
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Maybe ! But 555 cigarette packs may be available in abundance. That is why the first portable pacemake was made of the size of two ( 555?) cigarette packs ( Just joking!)

Majority of the inventions occur thorugh some accidental events such as the Blackout  ( Like the falling Apple for Newton?)

As they say , THE NEED IS THE MOTHER OF DISCOVERY.

cookiejar
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re: 555 born 1971
cookiejar   10/31/2014 11:49:38 AM
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Signetics introduced the 555 timer in 1971.  It was a bit of a power hog with major disturbances on the supply lines.  Even unijunction transistors gave more stable performance.

CMOS versions of  the 555 were a bit better, but I still preferred CMOS multivibrators and Schmitt trigger gates for low power applications.

bcarso
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re: 555 born 1971
bcarso   10/31/2014 1:55:24 PM
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I'm with you on the 555.  Although I have great respect for the late Hans Camenzind, I've preferred as you say to roll my own comparable functions out of CMOS and the occasional comparator.

 

Brad



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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