Electronics Forum / Components / February 2007

Check it out.  http://www.supplyframe.com/gopart
Saw it on EETimes.

Does anyone have very old (1950s) transistors (or know of a
collection/semiconductor museum with any)?
I am interested in photos of them and, if possible, simple tests to be
carried out on these grey-haired old timers.  I'm also interested in

All of the nicele manufactured designs I've see put the small square snap
action tactile buttons (little silver ones with the black rubber button) on
the PCB and the button part you push is just a plastic mechanism with a rod
behind it to push in the black rubber piece when the ...

I'm finding it very hard to get hold of a replacement IF transformer, like
those found in old AM radios.  I'm not too up on the jargon, but its a
silver cased IF transformer with an built in capacitor and an adjustable
ferrite slug inside (white/yellow colour coding).  I remember ...

to visit the NXP (nee Philips) website. I am replacing a legacy part and
needed the original datasheet for comparison purposes. It's not a
website, it's marketdroid mental masturbation.
We've had these rants before, of course, but I'm getting to the point of

I want to trigger a relay so that when the input voltage is at 95 VAC (134 V
peak), the relay is off.  When the input voltage is at a full 120 VAC (170 V
peak), or it goes beyond the 95 VAC threshold, then the relay is energized.
This circuit needs to be discrete enough to where I ...

I am looking for a panel-mount analog clock, either 120VAC or battery
powered.
Size I'm looking for is about the same as a 4.5" panel meter but I'm
not picky.

Multiple units in original boxes, new and unused for sale.  Various
date codes.  Located in Canada but can ship worldwide.
Please reply to winklerh@hotmail.com
Sincerely,

I see some use of BC414 and BC416 transistors in low noise circuits;
none of my regular suppliers have any, and I wonder whether anyone has
tried them and can recommend making the effort to get them from
somewhere (instead of using something like a BC550C as a substitute).

hi , i have a auto transmission ecu  , and i am trying  to id some
components , they are  bolted to a heatsink  and have :
a       T   on it , and   8c  written in tiny letters , then under that it
has      8055P

purely out of curiosity, is there anyone who can tell me what happened
to popular electronics mail-order companies of the 1970s like Poly Paks
in the US and BiPak & BiPrePak in the UK? There must have been a trend
that killed them off, and caused other medium sized names to ...

I need a 4 pole double throw switch, but all I can find are toggle
switches like this:
http://www.maplin.co.uk/Module.aspx?TabID=1&ModuleNo=2343&doy=10m2
What other types of switches of this type (4P2T) are available, and

My problem is "how fast can an LM393 drive the gate of a small MOSFET"? At
the moment the exact type of MOSFET isn't finalised, and even if it was I've
yet to see a datasheet give a straight answer on the actual value of gate
capacitance, if I knew that I could calculate the ...

does anybody know what is the function of this IC : L555 ? (8DIP)
At the moment I think it could be:
1) a NE555 clone timer
2) a PLL (Phase Locked Loop)

Does anyone know where I can get a copy of the specifications for a Philips
OM175 wideband RF amplifier IC?