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Old 14th April 2010, 07:06 AM   #21
col is offline col  Australia
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Default LED VU/clip meter based on LM3915

Hi Cristi,

To my knowledge, none of the ConnexElectronic amp modules have built in clip lights. They are not essential but are very useful. Can you make available a cheap module/accessory perhaps based on the LM3915 chip for this purpose? It doesn't need to be big and bright and could even use those multiple colour LEDs.

cheers,

col.
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Old 14th April 2010, 04:00 PM   #22
fb is offline fb  Australia
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Quote:
Originally Posted by Cristi View Post
sorry for late reply, i just came back after Easter Holiday, i had no internet where i was....
to use the speaker protection circuit for a BTL connected amplifier, the reference voltage (the floating GND which can be disconnected from the backside of the board) must be biased with a DC voltage equal to the output voltage with no input signal. if the amplifier is supplied at 30V DC, the outputs will have about 15V at idle. the GND reference of the speaker protection must be connected with a resistor divider between 30V and GND, and the amplifier supply voltage must be isolated from the speaker protection module supply voltage, with a small transformer or a separate transformer winding. i can provide you the transformer as well.
Cristi, I have your speaker protection modules with another vendors amp modules. Some modules for eg. are 2xBTL, TAS5630, with integrated SMPS on the module. I think supply voltage is 50vDC.

I think I understand your instructions that I have quoted. Is there a way to get the bias voltage without me having to intercept the supply voltage somewhere on the module's pcb?

Also, is it correct that the 'jumper' on back of board must be desoldered/disconnected to use with BTL amp?

Thanks
 
Old 15th April 2010, 01:19 AM   #23
Cristi is offline Cristi  Europe
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fb,
you must supply the speaker protection board with 12V which has no common GND with the amplifier. then connect the GND reference to a voltage divider which will provide half of the supply voltage, 25V. you can get this with a resistor divider which has a 47uF capacitor in parallel with each resistor. the resistor can be 2.2-4.7K at least 0.5W
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Old 20th May 2010, 11:13 PM   #24
alkasar is offline alkasar  France
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Hello,
I have finished my TDA8920BTH amp in BTL mode, with SMPS250 power.

To use the speaker protection module, is the cabling in this picture correct ?
Click the image to open in full size.
thanks,
 
Old 30th June 2010, 12:11 AM   #25
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Cristi I have the Soft Start module. I do not want to add a 12v switch, I would prefer to use just a switch from the mains. Can I just JUMPER connections 1 and 2 on the Soft Start instead of a switch?
 
Old 30th June 2010, 03:43 AM   #26
Cristi is offline Cristi  Europe
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Yes. But in this case must use a proper current rated main switch, who can withstand the current required by the mains transformer. Then the soft-start module will power on the relays automatically when will get mains voltage, one after another.
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Old 30th June 2010, 05:37 AM   #27
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Quote:
Originally Posted by Cristi View Post
Yes. But in this case must use a proper current rated main switch, who can withstand the current required by the mains transformer. Then the soft-start module will power on the relays automatically when will get mains voltage, one after another.
Great. Thanks Cristi.
 
Old 21st July 2010, 03:15 AM   #28
fb is offline fb  Australia
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Cristi, how fast do the relays disconnect on the protection modules when power is disconnected?
Does the same apply to the amps (V3c, V4) with protection built in? Is there a ‘loss of AC detector’?
 
Old 21st July 2010, 03:42 AM   #29
Cristi is offline Cristi  Europe
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If the speaker protection circuit is powered with AC voltage, it will disconnect in about 100-150ms after the AC voltage is lost. if the speaker protection module is powered from a DC voltage source such as SMPS, the AC detector should be connected at the 12V supply pin. then the relays will disconnect after the voltage will drop below threshold, about 8-9V. if need to disconnect faster, then a Zenner diode can be connected between the main voltage and speaker protection circuit, AC detect, for example +-50V supply. the diode should be connected with cathode at +50V and anode at AC detect. i used a 33 - 39V diode, so when the voltage will drop below 3x + threshold, will disconnect.
the TA3020v3c have this function, and the speaker protection disconnect the speaker relay imediatly after AC voltage is lost for the v3c AC power version or as soon as the voltage drop below 40-43V for the DC version. this might take 500ms to 1.5 seconds, depending on the capacitors size and supply voltage.
the TA3020v4 have the function as well, and disconnect the relay in about 300 - 500mS after power off.
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Old 19th January 2011, 11:24 PM   #30
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Hi Cristi,
is the speaker protection circuit for one channel or two ?
Thanks
fs
 

 


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