tweeter ( Compression driver) protection circuit - Page 3 - diyAudio
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Old 26th July 2007, 06:29 PM   #21
jaya000 is offline jaya000  India
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burnedfingers
Quote:
The 1156 is a simple back up bulb in an automobile rated at 21 watts lamp power.
The specification shows that it is 2.1 amps.
So even we calculate safely 13.2V x2.1A = 27.72W. i.e. 28 Watts.
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Old 26th July 2007, 08:30 PM   #22
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The bulb draws more current at 13.2V, the spec is for 12.8V.
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Old 27th July 2007, 04:12 AM   #23
jaya000 is offline jaya000  India
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In the circuit posted by phase_accurate :
The input device BC 546 can be changed to 2N5551.
I am thinking of changing the output darlington pair to darlington TIP 127 of TIP 147. TIP 147 or TIP 127 will also not need heatsink?
waiting 4 suggestions :
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Old 27th July 2007, 07:54 PM   #24
jaya000 is offline jaya000  India
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phase_accurate,
I assembled ur circuit.
I just changed the output darlington pair with TIP 127.
I hv to add 100ufd condensor in parallel to relay coil to avoid chattering.
Otherwise circuit worked ok.
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Old 27th July 2007, 10:01 PM   #25
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Quote:
I hv to add 100ufd condensor in parallel to relay coil to avoid chattering.
Mine worked OK without cap but this might depend on the relay's properties. I am pleased that you got it working.

Regards

Charles
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Old 28th July 2007, 12:38 PM   #26
jaya000 is offline jaya000  India
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How to select the cutoff voltage of relay & how to set it?
I am thinking of using ac voltage ( 50hz) as input to the circuit as source.
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Old 29th July 2007, 08:53 PM   #27
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Of course one could simply use a limiter on the feed/amp that runs the compression drivers set up so that it never exceeds the power rating of the drivers, and never clips the amps...

Otoh, running the compression driver with highly compressed signal due to the limiter running hard all the time at or near the max level for a sufficient period of time will also tend to cook the VC...

So, don't do that.

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Old 30th July 2007, 03:36 AM   #28
jaya000 is offline jaya000  India
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Thanks bear.
But i am talking about setting the circuit. To give input to the circuit, can i use normal AC 50hz as voltage source?
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Old 30th July 2007, 07:12 AM   #29
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Quote:
But i am talking about setting the circuit. To give input to the circuit, can i use normal AC 50hz as voltage source?
Do you want to use the mains to set the cutoff-point ? If so, then keep in mind that you should do this with an isolated variac. do not even think of plugging it into the mains directly. But you would still encounter problems setting the point properly since this TWEETER protection circuit is not meant to be run at 50 Hz !

Why don't you use the amp that it is inteneded to be used with to set the cutoff-point ?

Regards

Charles
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Old 30th July 2007, 02:47 PM   #30
jaya000 is offline jaya000  India
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Thanks phase_accurate,
I will use variac ( auto transformer) plus a step down transformer. So the input will be isolated.
Then i will check the AC input with the meter & will set the trigger point accordingly. As this is to do with few component value changes, hence selecting this AC voltage 50hz source. The protection circuit is going to operate on DC so there is no question of any frequency.
I think this will be ok as per ur guidance.
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