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Author Topic: X10 SC546A chime pitch control  (Read 125 times)


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X10 SC546A chime pitch control
« on: January 31, 2021, 09:00:49 PM »

I've found links to modify the old pitch on the original SC546 chime module.
What I can't find is anything on the newer SC546A module- note the "A" suffix.
the newer versions have 6 transistors and no separate "chime chip".
any leads/ideas anyone?

Brian H

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Re: X10 SC546A chime pitch control
« Reply #1 on: February 01, 2021, 09:23:39 AM »

Like you I have not found any information on the later version.
I will see if I can find some data even a schematic may help.
Yours probably has a output transformer driving the Piezo element. Like mine is.
X10WTI was trying to replace older hard to get parts with surface mounted parts. So you may find a completely different surface mounted controller in yours and powered by around 3 volts. As mine are not current Date Code units.
I have a feeling the Ding Dong tones are generated by the controller chips firmware and not easily modified.
The small power horn SH10A/PSH02 basically looks the same internally. Just responds differently to X10 commands. I did modify one of those to close a small relay when the Security Console sounded an alarm.
« Last Edit: February 01, 2021, 06:05:05 PM by Brian H »
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