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.
_-_-bear
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.
_-_-bear
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
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.
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.
In this case I would provisionally use a larger timing cap and set the working point with AC (the circuit is making "DC" out of it anyway).
Depending on the relay that you are using you'd have to change the emitter resistor of the darlington. Don't forget to calculate the losses in the darlington since it might need some cooling - depending on the current through the relay coil.
Regards
Charles
P.S. Here you can see one of my ringradiators packed into a small box (top right) together with the protection circuit and the crossover:http://www.diyaudio.com/forums/showthread.php?postid=1266503#post1266503
Depending on the relay that you are using you'd have to change the emitter resistor of the darlington. Don't forget to calculate the losses in the darlington since it might need some cooling - depending on the current through the relay coil.
Regards
Charles
P.S. Here you can see one of my ringradiators packed into a small box (top right) together with the protection circuit and the crossover:http://www.diyaudio.com/forums/showthread.php?postid=1266503#post1266503
regarding the cap: I'd place a 47 uF in parallel to the 1 uF while testing the thingie with 50 Hz.
Regading the Horns:
Woofer: EV Eliminator copy using a Fostex L467.
Midbass: My own (well almost !) using a Fane Studio 10M
Mid-High: Peavey. IIRC the horn was called FH-1 and the driver SP22 but I am not sure anymore.
Tweeter: Ringradiator PR130 by Audax (bloody expensive 25 years ago, one is lost unfortunately).
The system was used for disco in small to medium venues. In the latter case there were two additional TL4025 bass-bin copies used - stacked upon each other and placed inbetween the rest of the system.
Regards
Charles
Regading the Horns:
Woofer: EV Eliminator copy using a Fostex L467.
Midbass: My own (well almost !) using a Fane Studio 10M
Mid-High: Peavey. IIRC the horn was called FH-1 and the driver SP22 but I am not sure anymore.
Tweeter: Ringradiator PR130 by Audax (bloody expensive 25 years ago, one is lost unfortunately).
The system was used for disco in small to medium venues. In the latter case there were two additional TL4025 bass-bin copies used - stacked upon each other and placed inbetween the rest of the system.
Regards
Charles
bear:
The circuit consumes lot of current after conduction. The heatsink becomes hot. So i was thinking of using current limiter in the circuit so that it will not consume high current & load the amplifier. Most important is if the output transistor fails then the purpose of circuit becomes useless. This means the circuit will current controlled one.
Suggestions in the matter r highly appreciated.
I saw one speaker power, volts & current calculator at edaboard.com.
It might be useful.
Link :
http://www.edaboard.com/ftopic266410.html
But u hv to register to download it.
The circuit consumes lot of current after conduction. The heatsink becomes hot. So i was thinking of using current limiter in the circuit so that it will not consume high current & load the amplifier. Most important is if the output transistor fails then the purpose of circuit becomes useless. This means the circuit will current controlled one.
Suggestions in the matter r highly appreciated.
I saw one speaker power, volts & current calculator at edaboard.com.
It might be useful.
Link :
http://www.edaboard.com/ftopic266410.html
But u hv to register to download it.
bear:
On the diyspeakers.net forum today i read the following about tweeter protection :
The person for whom i am going to make is expert in blowing tweeters. I think that this problem is everywhere. Hence I thought for more development.
The circuit consumes lot of current after conduction. The heatsink becomes hot. So i was thinking of using current limiter in the circuit so that it will not consume high current & load the amplifier. Most important is if the output transistor fails due to high current, then the purpose of circuit becomes useless. This means the circuit will be current controlled one. Reading on this topic today
Suggestions in the matter r highly appreciated.
On the diyspeakers.net forum today i read the following about tweeter protection :
The person for whom i am going to make is expert in blowing tweeters. I think that this problem is everywhere. Hence I thought for more development.
The circuit consumes lot of current after conduction. The heatsink becomes hot. So i was thinking of using current limiter in the circuit so that it will not consume high current & load the amplifier. Most important is if the output transistor fails due to high current, then the purpose of circuit becomes useless. This means the circuit will be current controlled one. Reading on this topic today
Suggestions in the matter r highly appreciated.
Do you mean the protection circuit is consuming a lot of power and the amp's heatsink is getting hot ? I don't think so except you use some humunguous relay.
I think you are suffering from what I already hinted at: Don't fully disconnect the load from the crossover !!!!!!!!!! An LC crossover without load is a series resonant circuit. Driven at its resonant frequency it acts almost like a short circuit !!! Some amps do not like that !
Which doesn't matter at all since it is not needed anymore as soon as the amp gets unable to send output power to a load.
Active limiter circuits that the input of power amps (usually integrated into active controllers) are of course the most elegant solution.
Regards
Charles
Phase accurate,
I am sorry. I forgot to add the schematic of the another circuit i was working on.
I am now working on one more circuit after ur circuit became successful.
I am working on 2nd circuit of the attached page with darlington circuit.
But i am going to change it to pnp -npn combination.
The problem mentioned was of this circuit.
I am sorry. I forgot to add the schematic of the another circuit i was working on.
I am now working on one more circuit after ur circuit became successful.
I am working on 2nd circuit of the attached page with darlington circuit.
But i am going to change it to pnp -npn combination.
The problem mentioned was of this circuit.
Aahh a Zener - diode emulation. Looks like Elektor ?! Quite clever - but you will burn quite some power if you want to protect a high-power tweeter. You will not get around a large heat-sink. And you may use it only after a voltage divider otherwise you risk cooking your amp.
Regards
Charles
Regards
Charles
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