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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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