[Icom] Icom ps-125 schematic

Sat, 01 Jun 2002 10:43:49 -0700

Kevin,

Here is a modification by Matt, KK5DR, to reduce the fan speed full-time. The
fan is connected to the PSU board via a Molex-ended lead; Matt simply connected
a 50 ohm 5W resistor in series with the fan. You could connect a small
normally-open 30 or 35 deg.C thermostat across the resistor. You can mount the
thermostat on the internal heatsink.

The mod will not impact the PSU board; if you ever decide to sell the PS-125,
you will be able to restore it to "stock" easily.

http://www.qsl.net/kk5dr/PS-125.html

Best 73,
Adam, VA7OJ/AB4OJ
North Vancouver, BC, Canada
http://www.qsl.net/ab4oj/
Note new e-mail address:
mailto:[email protected]

-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of Kevin Schuchmann
Sent: Saturday, June 01, 2002 07:37
To: [email protected]
Subject: [Icom] icom ps-125 schematic

Hi All,
  has anyone run across a schematic of the ps-125?  I want to go inside and
modify the fan circuit so the fan will run all the time
at a very low and quiet setting, and then when it gets hot it will come up too
full speed like normal...  I find the fan switching
on and off  just receiving to be a little distracting...

Thanks
Kevin WA6FWF