Electronics Forum / Electronics / February 2005

I'm writing from a Gericom Webshox portable computer of 2001,
now the battery pack ( UN241S1 Rechargeable Li-Ion Battery Ratings:
14,4Vdc 3600mAh )
is broken son I decide to change the accumulators,

   I'm looking for a relay that could be used to switch off 2 pairs of
UTP (10baseT/100baseT) to protect an ethernet switch.
   The relay should disconnect at least 2 pairs (preferably 8-16) and
insert low loss in the lines. It could also be a, let's say,

As long as a Triac is run within specs, does it have a limited lifetime??
TIA
Ed Angell

I have an adapter with an output of 9V 1A DC adapter.
I need to convert this to 5V, 2A?
Any idea how I can make a little power supply circuit or something to
achieve this?

Is there an IC circuit I could use as a tank circuit? It is possible
to make resonnant circuit using resistors, and capacitors alone, so I
wonder if there is an IC chip I could wire somehow to make a tank
circuit...?

  Does anyone know how to get the svideo out from the card to work?
            Thanks

I have been looking at a new meter to measure current. I wanted another
method to measure instead of moving cables back and forth between
voltage/amps.
I was thinking that as a hobby builder I would want to measure between

in a simple electric circuit, in which you have a DC voltage
generator, an internal resistence and the resistence of the load, why
the maximum power that the generator is able to tranfer to load is
when load resistence is equal to internal resistence? I try to think

I'm hoping someone here can help with information about jamming satellite
TV reception on a particular dish.  My sister runs a small bar /
restaurant and we believe her satellite receiver has been jammed during
key sporting events by a competing business.  I am trying to discover 1)

I need an adapter with an output of 5V 2A DC. I cant seem to find it
anywhere, and even if I do it costs minimum $50. Well, thats a bit much for
my application.
Highest output current adapter I have is a 9V 1A DC adapter.

I have a digital recorder and I want to be able to download the audio
into my Dell laptop.  I can't find any info on either device concerning
the impedence of the inputs and outputs.
I would be going from the earphone jack on the recorder to the mic input

I own 5 snack vans and want to change fron petrol generators to power
invertors and 12/24v batteries to power my units!!
Anyone hepl!!

I've just moved to a country area in SA and I get virtually no mobile
signal. There is only one spot by a lounge room window that gives me 1
bar every now and then. I received the following suggestion to help
induct a signal "Some thing you can try for your Mobile. Stick a car

It's interesting to track the reliability of electronics from the
era of the TRF AM receiver up until now.  This spans about 75 years.  Many
significant gains have been made, but there is at least one big fly in the
ointment.  In my observation, the biggest fly is the electrolytic ...

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