Product Notes, Corrections and Updates
Replacement for Obsolete MM5369 IC
Used
for Sync Generator on Page 7-7 of AC Power Interference Handbook
By
Marv Loftness, KB7KK
The scope controller on page 7-6 of AC Power
Interference Handbook
By Marv Loftness, KB7KK uses a MM 5369 time base
generator chip to give him a stable 60Hz external sync signal for the scope. Unfortunately,
that chip is now obsolete.
Below are two possible options for a different chip
or a different schematic to furnish a stable 60Hz oscillator sync signal:
Option 1
http://www.elmelectronics.com/
This circuit generates both 60Hz and 1Hz from a
common 3.58MHz NTSC TV crystal. A synchronizing input is also provided for
locking the output to a 60Hz line frequency signal if available (recommended
for long-term stability). Switching between sync-lock and free-running is
automatic. Handy for battery-backed clock circuits.
Available in: 8-pin PDIP $8.00 CDN, 8-pin SOIC $9.50
CDN
Option 2
http://www.pacificsites.com/~brooke/PClock.shtml#5369
This page mentions that the
author has designed a replacement around a Programmable interface chip.
Page last modified: 10:25 AM, 19 Aug 2005 ET
Page author: epubs@arrl.org
Copyright © 2005, American Radio Relay League, Inc. All Rights Reserved.
