Re: PDA for Scouters


"Stephen Rainsbury" <stephen@xxxxxxxxxxxxxxxxxxxxxx -> wrote in message
news:zGVTk.88344$E41.347@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
SNIP
Techie reason for why my Palm Pilot Died (feel free to skip!)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Early palm pilots to maintain the supply voltage to retain their memory
(its volatile) which means they need a small device (1F capacitor) to hold
the voltage while you change batteries and to smooth out any brief losses
of power due to impact and loose connections.

My particular one (M125) is 8 years old uses a pair of very small
capacitors which only seemed to have had a life of about 4 years before
dieing. This was a design fault and they were withdrawn shortly after the
M125 went of production and even if you could get them they wouldn't work.

The replacement was much bigger and won't fit on the circuit board and
even if I frigged it then the whole thing would be too big for the case
and there isn't enough spare room to even cram them in with extra wires.

Ironically it still works all the time the battery is full but it used dry
cells and as soon as you swap them it loses its contents.

You can synchronise it to a PC but that doesn't help in the middle of a
field at midnight :-(


Don't know physical sizes etc but would 2 or more adding up to 1F fit in the
case if they could be got at a small size and fit in any available space?

Or what about this
http://www.rhopointcomponents.com/products.asp?recnumber=308

DaveB
West Yorks


.

Relevant Pages

  • Re: audio amplifiers: +/- X VDC vs 0-X VDC
    ... output is generating 50% of the supply voltage. ... you'd need a COUPLING capacitor. ... contents of this started) is termed as Decoupling capacitor which is ... literature and proclaim to be experts are just ignorant to say the least. ...
    (sci.electronics.basics)
  • Re: audio amplifiers: +/- X VDC vs 0-X VDC
    ... output is generating 50% of the supply voltage. ... you'd need a COUPLING capacitor. ... Yes, that is true, It's also termed Decoupling capacitor because of the interaction of what it's used in. ...
    (sci.electronics.basics)
  • Re: LM386 Coupling Capacitor
    ... > capacitor of this size at the local Radio Shack), ... at about half way between its positive and negative supply rails. ... positive side of the capacitor goes to the amplifier. ... This puts half the supply voltage on the speaker. ...
    (sci.electronics.basics)
  • Re: audio amplifiers: +/- X VDC vs 0-X VDC
    ... have problems because the design would force you bias the IC so that the ... output is generating 50% of the supply voltage. ... you'd need a COUPLING capacitor. ...
    (sci.electronics.basics)
  • Re: Sony Bravia - annoying hum - needs soldering
    ... So whay are sony saying, they forgot to fit said capacitor or it just ...
    (uk.tech.digital-tv)