Electronics Forum / Components / March 2006

http://www.dak.com/reviews/2007story.cfm?GAT
I purchased a DAK Shotgun Microphone and it is no different to a cheap
michrophone for a computer there is no sound amplification,does anyone
know how to get the sound to amplify?

Is there a current equivalent for the Raytheon RC4739?  I found the
NTE725 seemed to match, but can't find it anywhere.  Also, the ua739 &
TBA231 seemed to match, but again I can't find them.  Any leads on
where to find these or their equivalents?  

I'm modifying a 14.4v flashlight to use an array of LEDs. The voltage of the
white LEDs is 4.0v, and total draw is 0.145mA (measured).
This means dropping 10.4 volts, which means using a 72 ohm resistor (180 &
120 in parallel). This resistance evaporates 6-plus watts which is ...

I need to replace a 3.6 MHz VCO which drives a uC.  Looking at xtals, TCO's and
OCXO's in DigiKey, you'd think that nobody ever used - or has use for - a 3.6
MHz clock.  There's some high speed, crazy freq. stuff but no 3.6 MHz.
OK, I'll bag accurate and stable and settle for a ...

This is probably a rare need these days -- but are there any rail-to-rail
op-amps (both input and output) that can handle +/-15V supplies?  My search
through Linear Technology, Analog Devices, ... hasn't turned up anything.
Failing that, are there any that have R-R outputs, again ...

What's the story with this chip?  It's backordered everywhere, even at
ti, and you have to buy 90 of them.  Avnet would sell them individually
if only they would get them in stock, but no such luck.

There used to be a company or perhaps "companies" who would advertise for pc
boards out of junked equipment. I don't recall if it was for any "gold"
content or maybe some components value. I have a couple boxes of PC boards
sitting here that I use to scrap parts from when I'm ...

I recently picked up a Sansui T-80 tuner (circa 1981)... it's got some flaky
performance, sometimes good, sometimes not so good.  I'm going to replace
all of the ancient electrolytic caps but there is one I cannot source:
0.15uF 100V polar electrolytic

I am trying to build my own wall-wart pwer supply, and was wondering
what those small d.c. power plugs on the ends of the power supply were
called?  I'm sure if I knew the correct name I could find dozens of them
on digi-key, but as it is I search for "power connector" and I get ...

Anybody have a good source for a standard off-the-shelf TRIPLEXED LCD
numeric display, something around 0.3-0.56" tall characters (8-13mm)
with 4-1/2 digits, maybe some annunciators?  It needs to have DIP
pins, not the zebra elastomer type connections or heat seal strip.

Hi Group,
I am interested to have the datasheets for the above chips.  I've
looked into the OKI websites but they seem not to have the datasheet.
Is the 8755 only made by intel or was it second courced by NEC or

    Can anybody suggest a reasonably priced (less than ?15) source
of 1 or 2-off TDA1024 chip.  It is a now obsolete thermostat
controller chip which drives a triac.
TIA

I have a kit that I bougfht from RAdio Shack , Here is a link of what I am
talking about. (
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=6019532542&indexURL=    
)

Does any onr know a similar chip as NJM2073D as I was not able to get
it locally.  It is a 8 pin PDIP dual audio amp.  And it runs on 3V
battery.
A simple circuit using 2 audio amps constructed on a small vero-board

Need both TA7805S  and   TA7805F. If you can provide these please email me.
Thanks and take care.