Adding a 12volt trigger to B&O ICEPower modules

dimka100 · 21st May 2011, 02:42 AM

Hi guys,

I got an ICE Power 1000ASP module all hooked up and running but I do not understand how to connect a 3.5mm 12volt trigger to it. I’m trying to get the amplifier to go into a standby mode triggered by my HT Pre.

The ICE Power modules already have this feature implemented however I cannot understand how to connect the 3.5mm 12volt trigger to it.

I have attached a diagram from the B&O manual of how the 12volt trigger is supposed to be connected to the module, could someone please translate it to me into lamers terms and help me get it working.

Your help is very much appreciated, thank you.

thune · 21st May 2011, 04:58 AM

The circuit shown (whose external components I assume you have to add) will put the amp into shutdown when the "Control signal" has sufficient positive voltage applied. This would be the opposite of what you want in a 12v triggering setup (if i understand it correctly). To get a circuit that will default to shutdown/protect and then go active with a constant 12v applied, you could put another pull-down circuit in front of the one shown (that is, replicate R1,R2,BC546B,10k and put it in front of the circuit shown.) Such a circuit would *require* an applied voltage to get out of standby, so a switch might be needed to enable/disable the trigger circuit.

BTW, hooking your 12V trigger straight up to the standby/protect pin (without the pull-down circuit in the manual) might seem to work, but could potentially prevent the amp from activating the protection circuit (during power-up/down ,over-temperature, or over-current conditions).

Corrections to anything stated is appreciated.

dimka100 · 21st May 2011, 05:23 AM

When i measure the voltage across the standby and ground pin its constantly reading 12v when the amp is on.

my 12volt cable out of the HT Pre is also measuring 12volt when the Pre is on and 0 volts when its off.

I still don't understand how to get this working.

thune · 06:03 AM

If the voltage at the standby pin in 12V, that means that the external circuit shown in the manual is NOT there. You must construct an external circuit to drive the standby pin. (Now someone with more experience with the ICE POWER module might say something like "just connect the trigger to the standby pin through a 5k? ohm resistor, it works fine and won't break anything", but without a threshold voltage spec or knowledge of the detection circuit this is impossible for me to say.) The complexity is that you have to share this pin with the internal shutdown protection circuitry, so you must play nice with it.

thune · 21st May 2011, 07:12 AM

The basic circuit I described above would have this form:
icepower1000_trig_sm2.jpg

sofaspud · 21st May 2011, 07:48 AM

I have no hands-on with that particular equipment, but I think I understand the requirements. Without the external circuit, the shutdown pin is pulled high. The BC546B transistor is used as a switch to pull the pin low and enable standby mode. You want to enable standby mode via a trigger from your HT Pre. What trigger signal do you have coming from the HT Pre? Since the transistor is used only as a switch, other types can be used, so it seems to me it makes sense to match it with the signal sent from the HT Pre.
The buffer section is shown as simply an indicator. I don't think I'd bother with it.

dimka100 · 21st May 2011, 07:55 AM

Hi, thank you for this but I am not exactly sure how the Trig would enable the switch you got in your diagram?

The way i follow your diagram is as follows: the Trig would deliver a 12volt signal, the first resistor would reduce the current a lot, then the transistor would amplify the signal again? or switch the Vcc signal on? (Vcc signal is 12 volts as well btw). then the current would be reduced again by the next resistor and come to the next transistor where it would be applified and supplied to the Suspend pin?

dimka100 · 21st May 2011, 07:56 AM

The signal from the trigger is a constant 12Volts, ie when the Pre is on its constantly supplying 12Volts via the headphone type cable, when its off its 0 volts.

Quote:

Originally Posted by sofaspud

I have no hands-on with that particular equipment, but I think I understand the requirements. Without the external circuit, the shutdown pin is pulled high. The BC546B transistor is used as a switch to pull the pin low and enable standby mode. You want to enable standby mode via a trigger from your HT Pre. What trigger signal do you have coming from the HT Pre? Since the transistor is used only as a switch, other types can be used, so it seems to me it makes sense to match it with the signal sent from the HT Pre.
The buffer section is shown as simply an indicator. I don't think I'd bother with it.

sofaspud · 21st May 2011, 08:01 AM

Quote:

I’m trying to get the amplifier to go into a standby mode triggered by my HT Pre.

and

Quote:

The signal from the trigger is 12Volts, ie when the pre is on its 12Volts, when its off its 0 volts.

I'm confused. What you want is a "remote start", where the amp standby mode is disabled when the HT Pre is turned on. Is that correct?

dimka100 · 21st May 2011, 08:08 AM

Sorry i might have confused people a bit

What I'm trying to do is remote start the amp via the Pre. So essentially when i turn the Pre ON I want the Amp to turn ON and when I turn my Pre to Standby, I want my Amp to go into Standby mode as well

When the Pre is ON it outputs a 12volt signal via a trigger cable, its a constant 12volt signal, when the Pre is OFF the signal is 0 volts.

Quote:

Originally Posted by sofaspud

and

I'm confused. What you want is a "remote start", where the amp standby mode is disabled when the HT Pre is turned on. Is that correct?

21st May 2011, 05:56 AM	#4
thune diyAudio Member Join Date: Sep 2010	If the voltage at the standby pin in 12V, that means that the external circuit shown in the manual is NOT there. You must construct an external circuit to drive the standby pin. (Now someone with more experience with the ICE POWER module might say something like "just connect the trigger to the standby pin through a 5k? ohm resistor, it works fine and won't break anything", but without a threshold voltage spec or knowledge of the detection circuit this is impossible for me to say.) The complexity is that you have to share this pin with the internal shutdown protection circuitry, so you must play nice with it. Last edited by thune; 21st May 2011 at 06:03 AM.

21st May 2011, 07:48 AM	#6
sofaspud diyAudio Member Join Date: Nov 2005 Location: San Antonio TX	I have no hands-on with that particular equipment, but I think I understand the requirements. Without the external circuit, the shutdown pin is pulled high. The BC546B transistor is used as a switch to pull the pin low and enable standby mode. You want to enable standby mode via a trigger from your HT Pre. What trigger signal do you have coming from the HT Pre? Since the transistor is used only as a switch, other types can be used, so it seems to me it makes sense to match it with the signal sent from the HT Pre. The buffer section is shown as simply an indicator. I don't think I'd bother with it. __________________ It is error only, and not truth, that shrinks from enquiry. - Thomas Paine

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21st May 2011, 04:58 AM	#2
thune diyAudio Member Join Date: Sep 2010	The circuit shown (whose external components I assume you have to add) will put the amp into shutdown when the "Control signal" has sufficient positive voltage applied. This would be the opposite of what you want in a 12v triggering setup (if i understand it correctly). To get a circuit that will default to shutdown/protect and then go active with a constant 12v applied, you could put another pull-down circuit in front of the one shown (that is, replicate R1,R2,BC546B,10k and put it in front of the circuit shown.) Such a circuit would require an applied voltage to get out of standby, so a switch might be needed to enable/disable the trigger circuit. BTW, hooking your 12V trigger straight up to the standby/protect pin (without the pull-down circuit in the manual) might seem to work, but could potentially prevent the amp from activating the protection circuit (during power-up/down ,over-temperature, or over-current conditions). Corrections to anything stated is appreciated.

21st May 2011, 05:23 AM	#3
dimka100 diyAudio Member Join Date: May 2008	When i measure the voltage across the standby and ground pin its constantly reading 12v when the amp is on. my 12volt cable out of the HT Pre is also measuring 12volt when the Pre is on and 0 volts when its off. I still don't understand how to get this working.

21st May 2011, 07:12 AM	#5
thune diyAudio Member Join Date: Sep 2010	The basic circuit I described above would have this form: icepower1000_trig_sm2.jpg

21st May 2011, 07:55 AM	#7
dimka100 diyAudio Member Join Date: May 2008	Hi, thank you for this but I am not exactly sure how the Trig would enable the switch you got in your diagram? The way i follow your diagram is as follows: the Trig would deliver a 12volt signal, the first resistor would reduce the current a lot, then the transistor would amplify the signal again? or switch the Vcc signal on? (Vcc signal is 12 volts as well btw). then the current would be reduced again by the next resistor and come to the next transistor where it would be applified and supplied to the Suspend pin?

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