tweeter ( Compression driver) protection circuit - Page 2 - diyAudio
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Old 23rd July 2007, 09:16 AM   #11
AndrewT is offline AndrewT  Scotland
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Quote:
I recommend a 211-2 bulb for 1" coils, and an 1156 bulb for 1-1/2"~2" coils.
tell us the spec of the bulbs, so we can buy an equivalent.
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Old 23rd July 2007, 10:41 AM   #12
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http://autorepair.about.com/od/elect.../aa010502b.htm

The 1156 is a simple back up bulb in an automobile rated at 21 watts lamp power.

The 211 is an interior bulb.

I have used both per instructions from Mr. DJK in the past. The 1156 works great on the large drivers. When they are being pushed very hard the light starts to light and acts like a limiter.
Using the light only there is no interruption like there would be with a relay or poly switch.

This is perfect for any setup requiring protection and un interrupted service.
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Old 23rd July 2007, 10:44 AM   #13
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12673 GE MINIATURE LAMPS 12 volt - bulb No. 211-2BP GE LIGHTING
12673 GE MINIATURE LAMPS 12 volt - bulb No. 211-2BP GE LIGHTING "GE" MINIATURE LAMPS 12 ... ge miniature lamp, general electric miniature lamp, auto dome bulb.

I would assume that you have the same or similar across the pond.
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Old 23rd July 2007, 11:44 AM   #14
djk is offline djk
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"I recommend a 211-2 bulb for 1" coils, and an 1156 bulb for 1-1/2"~2" coils.
tell us the spec of the bulbs, so we can buy an equivalent."

Standard bulb numbers, consult a catalog.

http://www.1000bulbs.com/product.php?product=1835

http://www.1000bulbs.com/product.php?product=1647

The local Gas-n-Go sells the #1156 two for $0.99, the 211-2 are a bit more at $1.29 a pair.
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Old 23rd July 2007, 11:46 AM   #15
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I used something like the circuit in post 26 for years.
It was protecting a quite expensive Audax ring-radiator in a four-way horn-system. It worked quite well but one has to take care to not fully disconnect the load from the output of a passive high-pass crossover filter because it might damage the amplifier.
I can try to undig the circuit and maybe the layout as well (though a very unsexy one done with tape).

Regards

Charles
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Old 23rd July 2007, 04:07 PM   #16
jaya000 is offline jaya000  India
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waiting 4 ur circuit phase_accurate!
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Old 24th July 2007, 06:02 AM   #17
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You'll have to wait for another 24 hours if this is OK for U. IIRC the original idea was from Elektor magazine but slightly changed.

Regards

Charles
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Old 24th July 2007, 07:10 AM   #18
jaya000 is offline jaya000  India
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Iam ready to wait. Thanks in advance phase_accurate.
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Old 26th July 2007, 06:22 AM   #19
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I finally found it.

Some hints:

The reaction time is determined by the cap and the series resistor (2.2 k in this case) and the relay time constant.
The indicator LED and its parallel resistor can be left away if not needed.
For the rectifier bridge I would use some soft recovery diodes nowadays.
The small-signal PNP is of course a BD 556 and not a 546.
The sensitivity can be set with the 22k pot.
Do not switch off the load completely (as I did ) in the overload case - since a crossover highpass without load is the same as series resonant circuit - which some amps might not like.
You might want to use transistors with higher Vce capability (those were scarce 25 years ago !) than the ones I used.
Depending on what output voltage is expected from the amp in a speaker overload case - cooling of the "power" tranny might be necessary.

I also enclosed the layout (crossover & tweeter protection) but you might be faster doing a new design since I didn't properly note the component placement back then.

Regards

Charles
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Old 26th July 2007, 06:26 PM   #20
jaya000 is offline jaya000  India
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Thank u very much phase accurate.

I will only make for high pass filter. i will remove midband filter.

i will design the pcb new.
I will like to hv ur suggestions 4 good soft recovery diodes, & transistors 4 more reliability.
I will incorporate any other suggestion also.
I will add one resistor in the signal path parallel to relay for more option. This will be useful to get attenuated output after relay is on.
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