Featured Product Archive
The inventions and products featured on these pages were chosen either for their
uniqueness in the RF engineering realm, or are simply awesome (or ridiculous) enough
to warrant an appearance.
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RF Cafe visitor Tony C., who is an
engineer working for one of America's great, longtime manufacturers of green farm
equipment, sent me a link to this unique memory IC released by Signetics on April
1, 1973. This being April 1, 2017, it seems to be an appropriate day to post the
Signetics 25120 Fully Encoded, 9046 x N, Random access Write-Only Memory datasheet
that per Wikipedia, "...was created 'as a lark' by Signetics engineer John
G 'Jack' Curtis and was inspired by a fictitious and humorous vacuum tube datasheet
from the 1940s. It was seen as 'an icebreaker' and was deliberately included in
the Signetics catalog."
According to Wikipedia, founded in 1961 "Signetics [now NXP Semi] was an
American electronics pioneer, it was the first electronics manufacturer specifically
established to make integrated circuits." They made the ubiquitous
Also, don't forget the classic datasheet for the Watkins-Johnson WJ-G1/SMG1 Voltage-Controlled
Attenuator datasheet with the Phase
vs. VCTL vs. Frequency vs. Phase of the Moon Chart. While you're
wasting time, you might as well see the "slightly tentative data" for
WEMAC- The One Zed Two Zed Vacuum Tube that was purportedly the
inspiration for the Signetics 25120.
Posted April 1, 2017