Electronics Forum / Components / February 2005

I've got a simple circuit with a 555 timer flashing some LEDs. The
circuit diagram is at:
http://ourworld.compuserve.com/homepages/Bill_Bowden/555.htm#555leds.gif
It uses two transistors, a 2N2905 and a 2N3053. I have located a source

Looking for specs. on HY51C4256S-10   This is an old DIP RAM chip.
I tried the usual suspects including DataSheetArchive.com  but no joy.
If I can't find this particular chip, is there a newer, compatible
chip?  I have an old printer that would benefit from a few more megs of

I have a bunch of common mode chokes, but I need a bunch of
differential mode inductors. Sure, you can just reverse the direction
on one side, but then you might saturate...so, with molded ferrite core
common mode chokes, what kind of % of the rated current can be run in

Is there any published research/report about how much "uncertainity" and/or
variations must be expected on a PC clock frequency ?

I'm looking for MLC 1043 datasheet.
It's a speech processor manufactured by MCS company.
Thanks
JFS

1) Where can i find an programm that has an listing or HEX-file for an
PIC16F84 To convert to an processor in the 8051-familie? (for an 80C537)
2) I look an schematic for an Frequency counter with 8051-processor.
With thank

I am trying to locate some obsolete components.
After the usual google searches and numerous emails to vendors, I am hoping
someone here will have what I need.
I need 2 ea MPSH17's, 1 ea 2n4417, 1 ea MC145152 and 1 ea MC12017.

Among the stuff that I scrounged a week or two ago I got bag of a
hundred capacitors.  I think they're ceramic, and I'll describe the
case.  It's black and 5 mm square by 2mm thick, and is labeled
CK05

1) Where can i find an programm that has an listing or HEX-file for an
PIC16F84 To convert to an processor in the 8051-familie? (for an 80C537)
2) I look an schematic for an Frequency counter with 8051-processor.
With thank

Could anyone tell me where I can buy a small (say 5 Farad)
ultracapacitor (= EDLC capacitor or supercapacitor) in Australia?
Cheers
 Richard

Hi!  Does anyone here know where to purchase
NiMH cells of the type used in laptops? These
are normally rated @ 4 Ah or higher.
A link would be appreciated.

What type of capacitor is this?
http://home.earthlink.net/~rcalande/_images/image_index.html
It's about 7 inches in length by 3 inches in diameter.
Should I interpret the rating as 1800 WVDC or TS 1 and 8000 WVDC?

I've been using the CA3080A OTA from Intersil for quite a while now
for different purposes.
With my last order for this chip, my supplier informed me that the
chip is obsolete and he has run out of stock :-( He also could not

Hi, I look for conectors AMP 745412.
As shown in the following picture:
http://ecommas.tycoelectronics.com/commerce/DocumentDelivery/DDEController?Actio
n=showdoc&DocId=Customer+Drawing%7F745412%7FH%7Ftif%7FEnglish%7FENG_CD_745412_H.
tif
I need around 100 - 500 of them, based on the ...

Hi, I'm looking for datasheets for a Toshiba d455c and D546c391 found on a
20-year old board.  Does anyone have any information about these or know
where I should look?  Thanks in advance for any help you can give.