From: sleeper75se (sleeper75se_at_yahoo.se)
Date: 2002-03-26 16:29:52
--- In buildcheapeeg_at_yahoogroups.com, "Joerg Hansmann" <info_at_jhansmann.de> wrote:
> Hi all,
>
> here (in the attachment) is a (LTspice-simulated) circuit for
> temperature feedback.
Hi Joerg,
there seems to be a problem with the .asc file. It is almost empty...
Unfortunately, I can't comment on this - don't know anything about
thermistors.
> Does anyone know where to get very small NTC resistors ?
> (e.g. with B about 3940K, R_25=22k)
RS Components (and others I'm sure) has NTC resistors in 0805
packages. Small enough? :-) Time constant is 4 seconds, B=4100, R =
22k. They also sell bead-shaped resistance-temperature curve matched
NTC's that are easier to use, time constant is 10 seconds, 2.4mm in
diameter.
> The one I have bought has disk shape with diameter=4mm and depth=2mm
> and is fairly slow.
>
> BTW:
> The "modEEGamp1_15c_std.brd" is built now.
> Next thing to do is performance testing.
Good luck! :-)
Regards,
Andreas
This archive was generated by hypermail 2.1.4 : 2002-07-27 12:28:43 BST