PSN-L Email List Message
Subject: Question and Calibration Note
From: "Geoff" gmvoeth@...........
Date: Sat, 8 Dec 2007 20:15:55 -0700
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You must be over 17 since they are rated M.
Contact me direct if anyone is interested.
user name is gmvoeth
address is hotmail(dot)com
***** CAL MARK TIMER BOARD NOTE *********
Im using a timer board to mix cal marks
with the EQ data And have found it handy to
use a hot glue gun to create trimmer caps
for adjusting the oscillator.
You take a length of 22Ga insulated wire
strip off half the insulation then make an
L bend about 1mm long then overlap the
two wires 1mm sections then coat the overlap
with the hot glue holding everything
in place till it cools ( 15 min ? )
The oscillator must be first adjusted slightly fast
maybe one second every two to four days
then add trimmer caps like (one pico farad) 1pf or below
directly across the crystal ( 12MHz ? ) till
the timer is good for 48 hours or so.
( Estimated Within 0.1 seconds in 48 hours )
You should have a good cap meter to build these.
You can not expect to get the exact freq.
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