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(1)

You can find the GND (center POS/NEG) by probing with a multimeter. Probe around the capacitors on the PCB, as they all have a negative pin on the GND side and most likely no direct connection to the POS input.

You could also identify a component pin directly soldered to the GND-fill on the PCB visually.

(2)

By connecting a variable voltage-source to the POS pin and ramping it slowely from 1V8/3V3/5V0 until the circuit starts operating. I would personally guess either 3V3 or 5VO, as i cant see a pre-reg.

(3)

You could also write a email to the company or call them.

If you don't speak italian: Don't worry - englisch is fine most times.

If you didn't buy the component first-hand: Don't worry - most likely they will help.

Edit As i could not find a Codice-Fiscale: The company is most likely "gonski".

(4)

According to this spec-sheet - which uses the same ISDN interface APC5568-5V - i would say with some confidence: The circuit operates from 5V DC.

According to this memory datasheet i would strongly suggest, that the circuit operates from 5V0, as i can't see a DC/DC or pre-reg on the board.

(5)

Please see @TomCarpenter's answer - just excellent.

(1)

You can find the GND (center POS/NEG) by probing with a multimeter. Probe around the capacitors on the PCB, as they all have a negative pin on the GND side and most likely no direct connection to the POS input.

You could also identify a component pin directly soldered to the GND-fill on the PCB visually.

(2)

By connecting a variable voltage-source to the POS pin and ramping it slowely from 1V8/3V3/5V0 until the circuit starts operating. I would personally guess either 3V3 or 5VO, as i cant see a pre-reg.

(3)

You could also write a email to the company or call them.

If you don't speak italian: Don't worry - englisch is fine most times.

If you didn't buy the component first-hand: Don't worry - most likely they will help.

Edit As i could not find a Codice-Fiscale: The company is most likely "gonski".

(4)

According to this spec-sheet - which uses the same ISDN interface APC5568-5V - i would say with some confidence: The circuit operates from 5V DC.

According to this memory datasheet i would strongly suggest, that the circuit operates from 5V0, as i can't see a DC/DC or pre-reg on the board.

(1)

You can find the GND (center POS/NEG) by probing with a multimeter. Probe around the capacitors on the PCB, as they all have a negative pin on the GND side and most likely no direct connection to the POS input.

You could also identify a component pin directly soldered to the GND-fill on the PCB visually.

(2)

By connecting a variable voltage-source to the POS pin and ramping it slowely from 1V8/3V3/5V0 until the circuit starts operating. I would personally guess either 3V3 or 5VO, as i cant see a pre-reg.

(3)

You could also write a email to the company or call them.

If you don't speak italian: Don't worry - englisch is fine most times.

If you didn't buy the component first-hand: Don't worry - most likely they will help.

Edit As i could not find a Codice-Fiscale: The company is most likely "gonski".

(4)

According to this spec-sheet - which uses the same ISDN interface APC5568-5V - i would say with some confidence: The circuit operates from 5V DC.

According to this memory datasheet i would strongly suggest, that the circuit operates from 5V0, as i can't see a DC/DC or pre-reg on the board.

(5)

Please see @TomCarpenter's answer - just excellent.

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(1)

You can find the GND (center POS/NEG) by probing with a multimeter. Probe around the capacitors on the PCB, as they all have a negative pin on the GND side and most likely no direct connection to the POS input.

You could also identify a component pin directly soldered to the GND-fill on the PCB visually.

(2)

By connecting a variable voltage-source to the POS pin and ramping it slowely from 1V8/3V3/5V0 until the circuit starts operating. I would personally guess either 3V3 or 5VO, as i cant see a pre-reg.

(3)

You could also write a email to the company or call them.

If you don't speak italian: Don't worry - englisch is fine most times.

If you didn't buy the component first-hand: Don't worry - most likely they will help.

Edit As i could not find a Codice-Fiscale: The company is most likely "gonski".

(4)

According to this spec-sheet - which uses the same ISDN interface APC5568-5V - i would say with some confidence: The circuit operates from 5V DC.

According to this memory datasheet i would strongly suggest, that the circuit operates from 5V0, as i can't see a DC/DC or pre-reg on the board.

(1)

You can find the GND (center POS/NEG) by probing with a multimeter. Probe around the capacitors on the PCB, as they all have a negative pin on the GND side and most likely no direct connection to the POS input.

You could also identify a component pin directly soldered to the GND-fill on the PCB visually.

(2)

By connecting a variable voltage-source to the POS pin and ramping it slowely from 1V8/3V3/5V0 until the circuit starts operating. I would personally guess either 3V3 or 5VO, as i cant see a pre-reg.

(3)

You could also write a email to the company or call them.

If you don't speak italian: Don't worry - englisch is fine most times.

If you didn't buy the component first-hand: Don't worry - most likely they will help.

Edit As i could not find a Codice-Fiscale: The company is most likely "gonski".

(1)

You can find the GND (center POS/NEG) by probing with a multimeter. Probe around the capacitors on the PCB, as they all have a negative pin on the GND side and most likely no direct connection to the POS input.

You could also identify a component pin directly soldered to the GND-fill on the PCB visually.

(2)

By connecting a variable voltage-source to the POS pin and ramping it slowely from 1V8/3V3/5V0 until the circuit starts operating. I would personally guess either 3V3 or 5VO, as i cant see a pre-reg.

(3)

You could also write a email to the company or call them.

If you don't speak italian: Don't worry - englisch is fine most times.

If you didn't buy the component first-hand: Don't worry - most likely they will help.

Edit As i could not find a Codice-Fiscale: The company is most likely "gonski".

(4)

According to this spec-sheet - which uses the same ISDN interface APC5568-5V - i would say with some confidence: The circuit operates from 5V DC.

According to this memory datasheet i would strongly suggest, that the circuit operates from 5V0, as i can't see a DC/DC or pre-reg on the board.

added 87 characters in body
Source Link

(1)

You can find the GND (center POS/NEG) by probing with a multimeter. Probe around the capacitors on the PCB, as they all have a negative pin on the GND side and most likely no direct connection to the POS input.

You could also identify a component pin directly soldered to the GND-fill on the PCB visually.

(2)

By connecting a variable voltage-source to the POS pin and ramping it slowely from 1V8/3V3/5V0 until the circuit starts operating. I would personally guess either 3V3 or 5VO, as i cant see a pre-reg.

(3)

You could also write a email to the company or call them.

If you don't speak italian: Don't worry - englisch is fine most times.

If you didn't buy the component first-hand: Don't worry - most likely they will help.

Edit As i could not find a Codice-Fiscale: The company is most likely "gonski".

(1)

You can find the GND (center POS/NEG) by probing with a multimeter. Probe around the capacitors on the PCB, as they all have a negative pin on the GND side and most likely no direct connection to the POS input.

You could also identify a component pin directly soldered to the GND-fill on the PCB visually.

(2)

By connecting a variable voltage-source to the POS pin and ramping it slowely from 1V8/3V3/5V0 until the circuit starts operating. I would personally guess either 3V3 or 5VO, as i cant see a pre-reg.

(3)

You could also write a email to the company or call them.

If you don't speak italian: Don't worry - englisch is fine most times.

If you didn't buy the component first-hand: Don't worry - most likely they will help.

(1)

You can find the GND (center POS/NEG) by probing with a multimeter. Probe around the capacitors on the PCB, as they all have a negative pin on the GND side and most likely no direct connection to the POS input.

You could also identify a component pin directly soldered to the GND-fill on the PCB visually.

(2)

By connecting a variable voltage-source to the POS pin and ramping it slowely from 1V8/3V3/5V0 until the circuit starts operating. I would personally guess either 3V3 or 5VO, as i cant see a pre-reg.

(3)

You could also write a email to the company or call them.

If you don't speak italian: Don't worry - englisch is fine most times.

If you didn't buy the component first-hand: Don't worry - most likely they will help.

Edit As i could not find a Codice-Fiscale: The company is most likely "gonski".

Source Link
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