Hi,
I got this woofer Dell (Zylux) A525 from a friend without the satellite speakers.
It has for connecting the speakers a DB-9 Connector, which is also used to turn the unit on/off.
here is the pinout of the DB-9 connector
i know how to put speakers on it and connect input source. But i dont have any idea how to turn it off. It has something todo with Pin 6 (ST-BY standby ?) and Pin 7 VC (Vcc ?)
it uses the IC
TDA8947J
i have taken some screen shots of the board will post them tonight.
here are my questions.
1. how to turn on the woofer. Should i ground the Pin6 or should i short it with Pin 7 (vcc)
2. The circuit has two ground types
pin 1 is G
Pin 4 and 9 are PG
which ones are used for what purpose ? audio input with pin 1 G and output with PG 4 and 9 ?
i dont want to burn the amp/woofer so did not try to short them.
any help will be appreciated
I got this woofer Dell (Zylux) A525 from a friend without the satellite speakers.
It has for connecting the speakers a DB-9 Connector, which is also used to turn the unit on/off.
here is the pinout of the DB-9 connector
Code:
Pin 1-G
pin 2-R in
pin 3-L in
pin 4-PG
pin 5-R out
pin 6-ST BY
pin 7-VC
pin 8-L out
pin 9-PGi know how to put speakers on it and connect input source. But i dont have any idea how to turn it off. It has something todo with Pin 6 (ST-BY standby ?) and Pin 7 VC (Vcc ?)
it uses the IC
TDA8947J
i have taken some screen shots of the board will post them tonight.
here are my questions.
1. how to turn on the woofer. Should i ground the Pin6 or should i short it with Pin 7 (vcc)
2. The circuit has two ground types
pin 1 is G
Pin 4 and 9 are PG
which ones are used for what purpose ? audio input with pin 1 G and output with PG 4 and 9 ?
i dont want to burn the amp/woofer so did not try to short them.
any help will be appreciated
You can find the DS for TDA8947 online and it'll tell you what you need to know about how to mute/unmute the various channels. The chip has three ground pins as far as I recall - signal ground and two for power ground. 'G' is presumably going to signal ground and PG = power ground.
Hi,
I am not that big of expert, can just solder things, dont understand what they do and how they work. I already took a look at Datasheet and here is the relevent portion.
cant paste the table in the right way.
i will post pics of the pcb as it has some components connected to the mode select pins.
the Mode1 and Mode2 pins 5 and 10 are already connected (shorted) on PCB i will post the pics and will try to track the paths and will identify the components along with way.
I am not that big of expert, can just solder things, dont understand what they do and how they work. I already took a look at Datasheet and here is the relevent portion.
Code:
Mode selection
The TDA8947J has three functional modes which can be selected by applying the proper DC voltage to pin MODE1.
Standby — The current consumption is very low and the outputs are floating. The device is in the standby mode when VMODE1 < 0.8 V, or when the MODE1 pin is grounded. In the standby mode, the function of pin MODE2 has been disabled
Mute — The amplifier is DC-biased, but not operational (no audio output). This allows the input coupling capacitors to be charged to avoid pop-noise. The device is in the mute mode when 4.5 V < VMODE1 < (VCC - 3.5 V).
On — The amplifier is operating normally. The on mode is activated at VMODE1 > (VCC - 2.0 V). The output of channels 3 and 4 can be set to mute or on mode.
The output channels 3 and 4 can be switched on/off by applying a proper DC voltage to pin MODE2, under the condition that the output channels 1 and 2 are in the on mode
Voltage on pin Channel 1 and 2 Channel 3 and 4
MODE1 MODE2 (sub woofer)
0 to 0.8 V 0 to VCC standby standby
4.5 to (VCC - 3.5 V) 0 to VCC mute mute
(VCC - 2.0 V) to VCC 0 to (VCC - 3.5 V) on mute
(VCC - 2 V) to VCC on oncant paste the table in the right way.
i will post pics of the pcb as it has some components connected to the mode select pins.
the Mode1 and Mode2 pins 5 and 10 are already connected (shorted) on PCB i will post the pics and will try to track the paths and will identify the components along with way.
Here are the pics of PCB
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An externally hosted image should be here but it was not working when we last tested it.
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An externally hosted image should be here but it was not working when we last tested it.
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An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Connecting pins 6-7 should turn on the amp.
Pins 2-3 come from a preamp/volume control in the satellite speaker, with pin 1 as ground for preamp and signal.
Pins 4-9 are most likely speaker return grounds.
Pins 5-8 are + speaker output to the satellite speakers.
Pins 2-3 come from a preamp/volume control in the satellite speaker, with pin 1 as ground for preamp and signal.
Pins 4-9 are most likely speaker return grounds.
Pins 5-8 are + speaker output to the satellite speakers.
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