Thank you for your quick response and you help.  It is greatly appreciated.


Max

-----Original Message-----
From: Peter L. Peres <plp@ACTCOM.CO.IL>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: Tuesday, September 15, 1998 3:03 PM
Subject: Re: Electrolytic Capacitors and Heat [OT]


>> RC timing, capacitor C changes with rising temp
>
>The only option is to use a thermistor (ptc) together with the original
>timing resistor (in series).
>
>I don't know how accurate your timing must be but using an 85 C cap at 80
>C is not such a good idea imho. A 105 C rated one is a better choice imho.
>This will also likely be more accurate and have less problems with
>temperature changes (different electrolyte etc).
>
>BTW does the mains voltage not affect your design ? It can vary by +5/-5%
>usually, f.ex. due to increased load in a longer house feed line.
>
>hope this helps,
>
>Peter