Forums
New posts
Search forums
What's new
New posts
Latest activity
Members
Registered members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
DIY & Tutorials
DIY For Audio
The ultimate speaker protection system
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support AVForums:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="Rick" data-source="post: 578501" data-attributes="member: 17143"><p>Run the protection relay in the inverse (unpowered is closed contact), and use a strong AC pulse to the relay coil to break contact. The electromagnet is far stronger than the release spring. Run a DC current test and a 500ms AC pulse on the coil at around 1.5X rated voltage and you will see the contacts will always pull loose with the AC vibration and electromagnetic force. (take a relay and try stop it closing with your fingers, you will be surprised at how strong those coils are)</p><p></p><p>Use a second relay in series for the normal switch-on/off muting function and power the protection circuit with its own transformer.</p></blockquote><p></p>
[QUOTE="Rick, post: 578501, member: 17143"] Run the protection relay in the inverse (unpowered is closed contact), and use a strong AC pulse to the relay coil to break contact. The electromagnet is far stronger than the release spring. Run a DC current test and a 500ms AC pulse on the coil at around 1.5X rated voltage and you will see the contacts will always pull loose with the AC vibration and electromagnetic force. (take a relay and try stop it closing with your fingers, you will be surprised at how strong those coils are) Use a second relay in series for the normal switch-on/off muting function and power the protection circuit with its own transformer. [/QUOTE]
Insert quotes…
Verification
Post reply
DIY & Tutorials
DIY For Audio
The ultimate speaker protection system
Top