Reply to "How do you install a zener diode in a ZW Transformer"

Tracker John posted:

Why would you use a Zener to generate DC to trigger a whistle?  They are used for over-voltage protection, current would be rectified only when the instantaneous voltage is < 12v.

Because it works great across the board with old and modern horns and whistles. Air whistles may be a bit softer sounding. I've done this to my 5 ZW's.

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