Electronics Forum / Basics / October 2007

I have a keyboard controller that I'm going to re-purpose (not a Mame
controller).  The membranes from the original keyboard were friction
fitted to some traces of black conductive stuff on the card.  Will solder
stick to this stuff.

I need to ask some basic questions which I am not able to find good
answers for.
When I look at filter programs and other information regarding filter
responses I see phase and gain plots. Could someone tell me how phase

On Oct 2, 2:29 am, Richard Dobson <richarddob...@blueyonder.co.uk> wrote
in http://groups.google.com/group/comp.dsp/msg/11f383f778ac9539 :

Any recommendations for a device to make the conversion mentioned in the
Subject line? I think I need a converter and plug (round prongs). At most I
would expect to be charging batteries for camera equipment. Now that I think
about it *maybe* a small solar panel (available at ...

I was recently reading the book "Write Great code by ryndall Hyde" in
this in chapter 8 the following are given.
given n input variables there are two raised to two raised to n
unique  Boolean functions ex:- for 2 i/p variables there are 16

This circuit was designed for me a couple of years ago to detect an
interruption in a static laser beam by a photocell.
+5>---+-------------+
     |             |

I have some 7 segment displays with the letter H stamped on them and
some with G, what does the H and G mean?
ta

Point 1:
I wanted to build a simple device to tell if a single leg of a 240Vac
3-phase machine is dropping out momentarily. My first thought is a simple
voltage divider (1/4watt resistors in series) across any two legs, pulling a

I already own the books "How to Use Oscilloscopes and Other Test
Equipment" by R. Penfold, "The XYZ's of Oscilloscopes" by Tektronix,
and "101 Ways to use your ... Oscilloscope" by R. Middleton.
How do I get something to show up on my scope?

i am search for job

hi, i am in the uk, and need a 0.5 rpm ,low voltage (3v to 12v)motor
no real torque needed its just to rotatae a disc slowly.....anyone
know what might do ?
dave

I've been stuck on this for awhile.  I've got a MOSFET that is not
behaving the way I expect.
I was hoping it would act similar to the following animation where
source to drain is controlled by the gate:

Can anyone recommend a SMT equivalent or better to the 2n3904? Either
they don't make 2n3904 in SMT or Digikey doesn't stock it. I've been
looking through Digikeys SMT BJT's and it seems that the 2n3904 has
superior switching characteristics (storage, rise and fall) then the

I accidently bridged the 11v power input and ground on my dvd drive, and fried something. Is there something obvious that this could be?
I mean is directly connecting the power and ground going to cause an obvious problem???
Cheers in advance

I recently came across the data sheet for the MJL21193/4
series of transistors for linear amplifier applications,
http://www.onsemi.com/pub/Collateral/MJL21193-D.PDF
and see that they describe them as being made with