Electronics Forum / Basics / November 2007

so i have a  **DM7496**  (DIP16) that is fried (obsolete), and i
need compatible replacement
datasheet says  5-Bit shift register,  R-S master slave flip
flops , parallel in/out, serial in/out

To make a model rocket ignitor which works with AC current I connected
a piece of nichrome wire ~4cms (the heating element u'll find in old
electric stoves) . When I switced on fuse blown out in my home.  The
total length of wire is 50cms and was rated 1500W. So as if the length

here are the specs for the one i think i need....8-function, 20-range
multimeter offers true RMS readings for accurate voltage, current and
temperature. CAT III-600V rating. Audible and visual warnings to help
improper test lead input. this one does everything the following one

I have a question about multimeters and was wondering if ne one could
answer a question for me.
I was curious if it was more important if the meter has an autoranging
function or a true RMS function. I need to purchase one and I don't

i have a couple of mystery transformer pulls {microwave, vcr,
clock radio, etc}
i try to google codes on trans with no proper hits ...
how to id these transformers ?  is there a way  ? do the numbers

Not too sure if this is the right place to ask but I need a panel
mount fuse holder for 250 volt AC, the only ones I can find is plastic
one rated for 500 volts DC.  Are these safe for using on DC? A pretty
stupid question I know.

I'm very inexperienced and am looking for advise on how best to solve my
problem:
I need to illuminate a small area with white LEDs during daylight, and IR
LEDs during the night. The intensity of the white LEDs should go down as the

Dear Group,
I currently have a 120/220VAC SCR DC motor controller to power a 90VDC
motor which is connected to a milling machine spindle.
It uses a varible resister / pot to ajust motor RPM.

I have been searching all over for a simple photo led circuit that can
act as a counter. Counts one every time the beam is broken. Can
anybody direct me to such a simple circuit on the internet?
Thanks,

I have a device requiring 9v AC 2.5 Amp.
So do I get a 240v-9v transformer from the electronics shop and put it in a
case,  attach the correct leads and I'm done.
I suppose an inline fuse might be a safety precaution.

Hi - I need a 10.7 Mhz signal to debug an FM receiver kit I am putting
together. I have a Z8 Encore microcontroller eval board I bought
sometime ago so I might be able to use the pwm signal from it, but
otherwise I'll probably need to use some sort of crystal oscillator.

Two units both powered by 6 volt wal warts; the portable end can also
use a 9 volt battery. Two channels. The portable unit has the number
71565; apart from that appears complete absence of any numbers, model
or otherwise!

hello sir,
I really need the DAA solution complete .
please send me at ankur.1987@yahoo.co.in

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a silly question that google can't seem to answer... are any LDRs
available that will _reduce_ resistance as light _increases_?... or is
this a circuit type that i should learn to build?... i bought a few
radio shack and have tested them, but they all decrease resistance as