The remnants of a Fedback FG600 England made function generator of 1975. Someone clipped the legs of one of those canned devices of the time leaving
10 longish pins in the board. Overlay is a circle with a tab. He wrote RC4195 and RC4185 on pcb. Now a Raytheon RC4195 looks right there, a dual tracking +/-15V regulator but what was an RC4185 I cannot find any reference to it , but it may have been the original device and he intended replacing with a 4195. The drilling pattern was 8 like standard DIL and one between 1 and 8 and one between 4 and 5 but of course may have been bent to that form , from a circular TO96 type package.
7815 + 7915 will go in there firstly for proving purposes in all likelihood
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M
Meat Plow
Plenty of reference to 4195, none to 4815. If the part ever existed there should be some reference even as obsolete. Maybe a mental error.
H
hrhofmann
ng
nce
g
one
od
You do work on a lot of antiques!!!
N
N_Cook
leaving
reference
replacing
one
likelihood
I've looked in my contemporaneous sources and nothing He actually wrote , very clear script, RC4185NB RC4195NB which are valid suffixes for Raytheon
M
Meat Plow
RC4185TK ?
B
bob
N_Cook wrote:
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HYBRID OSCILLATOR, HCMOS, TRI-STATE 79.93 Kb, 2 Pages. Price & Availability PDF Download datasheet frame ID 1 4185-31 Monitor Products Co., Inc. HYBRID OSCILLATOR, HCMOS, TRI-STATE 79.93 Kb, 2 Pages. Price & Availability PDF Download datasheet frame ID 1 4185-32 Monitor Products Co., Inc. HYBRID OSCILLATOR, HCMOS, TRI-STATE 79.93 Kb, 2 Pages. Price & Availability PDF Download datasheet frame ID 1 4185-33 Monitor Products Co., Inc. HYBRID OSCILLATOR, HCMOS, TRI-STATE 79.93 Kb, 2 Pages. Price & Availability PDF Download datasheet frame ID 1 4185-34 Monitor Products Co., Inc. HYBRID OSCILLATOR, HCMOS, TRI-STATE 79.93 Kb, 2 Pages. Price & Availability PDF Download datasheet frame ID 1 4185-35 Monitor Products Co., Inc. HYBRID OSCILLATOR, HCMOS, TRI-STATE 79.93 Kb, 2 Pages. Price & Availability PDF Download datasheet frame ID 1 4185-36 Monitor Products Co., Inc. HYBRID OSCILLATOR, HCMOS, TRI-STATE 79.93 Kb, 2 Pages. 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What does it all mean? who knows....
bob
J
Joe Rooney
leaving
reference
one
likelihood
Here's a theory, maybe the lettering was abraded but he wanted to memorialize what info he had right on the board before he headed to the reference library or the parts store with the IC in hand.
Joe Rooney
N
N_Cook
dual
replacing
Interesting you say that Another IC he'd marked on the board , but still in place is a Plessey multi transistor pack It is that chalky print of the time and wrote SL304?? 5C? With good slant lighting , perhaps decades on I could confirm SL3045C
But RC4195NB is not a 10 pin pack if the 5th character was indistinct
M
Meat Plow
Take it to a forensic print analyst. They can analyze under polarized and oblique lighting of various wave lengths through various filters your sample and tell you what was written.
F
Franc Zabkar
On Wed, 24 Feb 2010 12:08:01 -0500, Meat Plow put finger to keyboard and composed:
FWIW Usbid lists a RC4185TK manufactured by Raytheon with a date code of 7925:
formatting link
- Franc Zabkar
Please remove one 'i' from my address when replying by email.
N
N_Cook
Is it a genuine outfit ? ie does a "Request for Quote (RFQ)" return mean they actually have one assuming you cough up 300 USD .
Although footprint is 10 pins , only 9 have traces to them, but wire size legs rather than the TO66 package pins and overlay would suggest TO66. I wonder if the 4185 was not-fixed +/-V. My old Raytheon book seems to suggest they used TK suffix for TO99 and TO66
R
Reinhard Zwirner
N_Cook schrieb: [...]
Hmm ... Could it be that your 4185 is one of Raytheon's latest products which has been produced only for a short time?
Databook 1976: 4194/4195 voltage regulators 1985: 4194/4195 + 4191/4192/4193 (+ 4391) voltage regulators 1989: 4194/4195 + 4191/4192/4193 + 4190 (+ 4391 + 4292) voltage regulators 19xx: ... + 4185??
When did Raytheon disappear from the semiconductor market?
Considering as possibility
Reinhard
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