tweeter ( Compression driver) protection circuit - diyAudio
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Old 19th July 2007, 10:30 AM   #1
jaya000 is offline jaya000  India
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Default tweeter ( Compression driver) protection circuit

To protect tweeter ( Compression driver) of 50~60W from blowing, some transistor circuit is used. can u suggest some?
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Old 20th July 2007, 04:38 AM   #2
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You need a semiconductor called a PolySwitch, an RXE110 is abought right. It goes in series with the hot lead to the compression driver. You will also need a 2R2 15W resistor, wire this in series with an 1156 automotive lamp. Wire this combination in parallel with the PolySwitch.

You can buy this ready made from Peavey for $30, or make it
yourself for less than $5.

http://www.partsexpress.com/pe/showd...number=071-262

http://www.madisound.com/catalog/pro...oducts_id=1015
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Old 20th July 2007, 10:26 AM   #3
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http://www.peavey.com/products/brows...on+Circuit.cfm

Click the image to open in full size.
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Old 21st July 2007, 12:14 PM   #4
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DJK,

You put me on to this a few years back. I've used it in several instances when diaphram replacement was extremely time consuming and dangerous. It works great and protects the drivers. In one church that I used it I haven't been back since to replace any of the drivers.
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Old 22nd July 2007, 04:55 PM   #5
jaya000 is offline jaya000  India
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Here is a circuit suggested by my friend. But it is very old & for small tweeter. I want to use it for 40~60W compression driver. So it need to be modified & more reliable.
Waiting for suggestion & modifications required.
Attached Files
File Type: pdf loudspeaker protector r.pdf (98.1 KB, 1076 views)
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Old 23rd July 2007, 01:39 AM   #6
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A lot of un-needed fuss.

http://archives.telex.com/archives/E.../STR%20EDS.pdf

http://archives.telex.com/archives/E...%20Service.pdf

I would use Schottky diodes for lower noise.

There is another note I can't find that showed adding a lightbulb across the relay contacts. Changing the series resistance higher will allow for a 2" coil, the original was for a 1" coil driver.

I recommend a 211-2 bulb for 1" coils, and an 1156 bulb for 1-1/2"~2" coils.
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Old 23rd July 2007, 02:47 AM   #7
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The relay listed is of course no longer available.

The manufacturer was American Zettler, and their current lineup contains:

9V (nominal) 18.0V (max) 405 (ohms) 6.3V (must pull-in)
pn AZ5X-1C-9DSE or AZ5Y-1C-9DSE

You can cross that to another brand if you like.

While it is only a 1A relay, it can handle 5A with a lightbulb across itself. For midrange use a 15V~18V zener should go across the coil to prevent overvoltage.
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Old 23rd July 2007, 03:38 AM   #8
jaya000 is offline jaya000  India
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Thanks djk.
This circuits hv same principle. So better to study during development.
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Old 23rd July 2007, 05:15 AM   #9
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Try an automobile parking light in series with the load.

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Old 23rd July 2007, 09:58 AM   #10
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Yep, that's what is in the Peavey gizmo, an 1156 backup lamp.
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