Hi
I have a Thule Audio PA350B. The amp has a network port (JR45) that is used to control the amp from the Thule Audio preamp. The port may be used to turn the amp on/off and to select between 2-channel or multichannel mode.
I need to control the amp. My idea is to make an simple aurdino bord with a JR45 jack and software that controls the amp. For example based on a 12v trigger from my prosessor (not Thule Audio).
My problem is that I do not know how to wire the JR45 to the Aurdino (what wire to ground and so on) and I do not know the commands.
Anyone that has some knowledge, or even ideas about how to move on to make this work?
I have the service manual for the amp (attached). Thule Audio is gone long time ago, so no help there.
PS: I have aurdiono boards and anything needed to start testing.
I have a Thule Audio PA350B. The amp has a network port (JR45) that is used to control the amp from the Thule Audio preamp. The port may be used to turn the amp on/off and to select between 2-channel or multichannel mode.
I need to control the amp. My idea is to make an simple aurdino bord with a JR45 jack and software that controls the amp. For example based on a 12v trigger from my prosessor (not Thule Audio).
My problem is that I do not know how to wire the JR45 to the Aurdino (what wire to ground and so on) and I do not know the commands.
Anyone that has some knowledge, or even ideas about how to move on to make this work?
I have the service manual for the amp (attached). Thule Audio is gone long time ago, so no help there.
PS: I have aurdiono boards and anything needed to start testing.
I see P20 connector is used to interface LM1972 & 74HC595 .
Internet is bloated by arduino 595 libraries, and I sure you can find one for LM1972 as well.
I'd connect arduino to P20 with resistors in series to be safe, as interface likely be slow speed.
Anyway, use multimeter to check voltages, before do any connections. Better get HC595 to experiment and get familiar with controlling it.
Than anything else looks easy, since bit-map is hardwired on schematics.
Internet is bloated by arduino 595 libraries, and I sure you can find one for LM1972 as well.
I'd connect arduino to P20 with resistors in series to be safe, as interface likely be slow speed.
Anyway, use multimeter to check voltages, before do any connections. Better get HC595 to experiment and get familiar with controlling it.
Than anything else looks easy, since bit-map is hardwired on schematics.
Thanks for the input.
I’m hopening on connecting the aurdino using the dara IO port on the amp.
I’m not quite sure if the suggestion was to connect directly to the P20 connector, or if it was refered to as bacground info for where the data io port is connected.
Seems like a jr45 cabel normally has 8 connectors.
I’m currently not able to track what wire on the jr45 cnnector is connected to what pin on the p20. Is there a way to get that from the schematics?
Or how to figure it out.
I’m hopening on connecting the aurdino using the dara IO port on the amp.
I’m not quite sure if the suggestion was to connect directly to the P20 connector, or if it was refered to as bacground info for where the data io port is connected.
Seems like a jr45 cabel normally has 8 connectors.
I’m currently not able to track what wire on the jr45 cnnector is connected to what pin on the p20. Is there a way to get that from the schematics?
Or how to figure it out.
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Right, connector P20 is internal to control module. So service manual is not complete, page where uCPU + likely remote IR receiver + indicator (red digit) absent.front panel
Since its ~20 years, used uCPU probably out of production. It 'd make sense to replace control unit by arduino. I see just two buttons, indicator and H595 +lm1972. All quite easy to get running with arduino.
Since its ~20 years, used uCPU probably out of production. It 'd make sense to replace control unit by arduino. I see just two buttons, indicator and H595 +lm1972. All quite easy to get running with arduino.
I actually found a user manual I have not found before, and with that a technical specification and much simpler solution.
Especially this part:
So, I just need to rig a 5-12v trigger signal (from my av-processor) to a jr45 jack plug and that will archive my goal.
As the amp then is in standby mode (instead of fully powered off) it will remember the channel mode.
Especially this part:
So, I just need to rig a 5-12v trigger signal (from my av-processor) to a jr45 jack plug and that will archive my goal.
As the amp then is in standby mode (instead of fully powered off) it will remember the channel mode.
Been testing this today, but with no luck.
I’m getting the 12v trigger from my Marantz processor to the jr45 IO data on the 350B, but it does not wake up or give any indication that there is a signal.
I have an old Thule Audio AV100. Connecting that to the control port works, but it seems to control it using data (I see from the spec that the output is data/clock, and measuring the voltage shows that it output 3.27V over the two pins both when standby and powered up).
At first I looked at the spec for a AV350, and that had 12V output on pin5 and a 5V output on pin6, so I just assumed that was the same for my AV100, and thought I could check that output and recreate, but as there is only data/ lock on the AV100 that did not work.
I’m wondering if I need both the 5V standby output and the 12V operator input to be able to control the standby mode of the PA350B😳?
Not sure - only sure that I’m so fare is not able to make it work. And its quite annoying😵💫
I’m getting the 12v trigger from my Marantz processor to the jr45 IO data on the 350B, but it does not wake up or give any indication that there is a signal.
I have an old Thule Audio AV100. Connecting that to the control port works, but it seems to control it using data (I see from the spec that the output is data/clock, and measuring the voltage shows that it output 3.27V over the two pins both when standby and powered up).
At first I looked at the spec for a AV350, and that had 12V output on pin5 and a 5V output on pin6, so I just assumed that was the same for my AV100, and thought I could check that output and recreate, but as there is only data/ lock on the AV100 that did not work.
I’m wondering if I need both the 5V standby output and the 12V operator input to be able to control the standby mode of the PA350B😳?
Not sure - only sure that I’m so fare is not able to make it work. And its quite annoying😵💫
Can you open it and trace wiring? There is a chance, that control module has labels. At least +12 +5 and Gnd must have
If you have a scope (DSO type) you could capture the data/clock sequence and mimic it with the arduino. I fear that the only way the amp is controllable is via the data/clock method due to the "for communication with other Thule Audio Equipment" statement.
I also suspect that it’s only via the data/clock the amp is controllable. I have for sure tested 12v on pin8/pin3, and that is for sure not working (but it is controllable from the AV100, so at least I know it is possible).
Found this in the service manual.
Service manual the drawing is from:
https://1drv.ms/b/c/db1e11b2cf05fb28/EYEDfJWGCRJOtKkXLGkJKjABjbR4u0c3Hw2jw0ADBS9YRw
Found this in the service manual.
Service manual the drawing is from:
https://1drv.ms/b/c/db1e11b2cf05fb28/EYEDfJWGCRJOtKkXLGkJKjABjbR4u0c3Hw2jw0ADBS9YRw