My Thoughts on TMG So Far - CPU Needs Improvement

jazzie366

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Hi everyone! I've been dead for awhile and that's because work is that way sometimes. However, I currently had a second CPU failure, and I thought I'd make a thread on my thoughts of the sytem overall and some tweaks that should be made to improve it overall.

So, to start off, the filtering on the CPU is sub-par for a device that is so sensitive. What I mean by this is that if we look back at the pictures I posted of the inside of the CPU, it has one, 1000uF 25V capacitor to use to filter out transient noise. However, I'm pretty sure that's not going to do it for people who have vehicles like me. I have a custom sound system with an android radio and external amplifier, plus I have LED lights all over my vehicle. Also, I drive a diesel. Why does that matter? Common Rail (CR) diesel vehicles use a single high pressure fuel pump to provide around 1500-2000PSI (on passenger vehicles with smaller diesels) to the injectors. These injectors need exceptionally high current to open as they are fighting much higher pressures. This also means the voltage spike that comes off of these is going to be MUCH higher than a normal injector.

Now, as you guys might know, I drive a Volkswagen. Why is this an issue for this particular topic? The alternator goes through an electrical bus, through a fuse, to the battery. That means that the noise from the alternator will reach most of the electronics in the car before it can be buffered out by the battery. This is a major concern for those of us running jammers in VWAG vehicles, as most of them are like this.

Now, if we read the TMG manual, we see that they say to uncoil the wire when bench testing as the magnetic field can compromise the performance of the jammers. This is an issue for anyone who decides to route their cables through a body harness grommet in their vehicles. Lots of signals for many things flow through those wires, all of them generating a magnetic field. The TMG cables need to have a grounded sheath around the shielding they already have. Large electromagnetic fields can easily penetrate a shield, even if it's made top tier. An easy solution to this is having a ground connected at each end of the head wiring to fix this, or use a thicker shield that can dissipate through the CPU ground.

Another issue that I saw that other users had is with the volume buttons. While I never touch my CPU enough to warrant the volume being changed, I will note that the design is direct contact from the trim plates to the switch. A pressure limiting spring should be added in-between the switch to limit the pressure applied so it cannot damage the switches in a manner that will damage them beyond repair.

Also, the volume of the speaker is on the low side. If I am 100% blasting my radio, there's no way I'm going to hear my CPU over the radio. A more powerful amplifier should be used with a slightly larger speaker.

Now, I know a lot of users are going to say, "Hey, but this will make the CPU more expensive!"

In reality, it should have 0 effect on cost. The circuit board currently in use, in the same size can be used. The only difference is the switches would have to be moved back about 5/32nds of an inch, and the capacitor would have to be mounted straight, also moved about 5/32nds inwards. A small filtering choke can then be added to filter out high voltage ripple on the incoming supply, and springs can be added to the switches. A 5w speaker compared to a 3w speaker with a slightly larger amplifier IC shouldn't add much to cost. However, if for some reason it is necessary to raise the pricing, I would expect no more than $10 in an increase. Keep in mind, this is what I would assume considering TMG would be sourcing all parts and modifications necessary at extremely low cost due to them getting them at manufacturer pricing. I could be completely wrong, but in my experience with manufacturing, these parts shouldn't cost much at all.
 

SquirrelMaster

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Sorry you have to deal with these issues. Maybe you could add some sort of filtering on the power supply before it goes into the TMG to mitigate this.

Do you happen to know which component exactly is failing? IIRC you had your system apart and seemed knowledgeable so if you did any advanced troubleshooting of what exactly failed, we could come up with a fix for you!
 

jazzie366

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Sorry you have to deal with these issues. Maybe you could add some sort of filtering on the power supply before it goes into the TMG to mitigate this.

Do you happen to know which component exactly is failing? IIRC you had your system apart and seemed knowledgeable so if you did any advanced troubleshooting of what exactly failed, we could come up with a fix for you!
Last time was a diode failure. Can't trouble shoot this one as giving it power and checking the power rails shows no issues. I removed a volume button as well because it was making a volume up noise before it died. Still no power on. It seems like a CPU failure.

Sent from my Armor_2 using Tapatalk
 

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Last time was a diode failure. Can't trouble shoot this one as giving it power and checking the power rails shows no issues. I removed a volume button as well because it was making a volume up noise before it died. Still no power on. It seems like a CPU failure.

Sent from my Armor_2 using Tapatalk
If I'm correct, there's two cpus inside right? I wonder if a transient spike just fries one of them.
Hope you're still covered by warranty
 

jazzie366

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If I'm correct, there's two cpus inside right? I wonder if a transient spike just fries one of them.
Hope you're still covered by warranty
I am, thankfully.

Sent from my Armor_2 using Tapatalk
 

Jag42

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@jazzie366 Clearly we have an issue going on here. The last Cpu i sent was brand new,and tested by me. I would run your 12v plug for power,instead of your hardwire. The 12v plug can handle much more electrical abuse,it does not even blow with a bad diode on my testing. Tmg has been making laser jammers since 1997, they have not had an issue with installs along with other wiring harnesses. They install in BMW,than most brands. In fact my cabeling is right on top of a massive wire harness through a grommit on my car. I will pass all your recommendation to the Tmg engineers. I will test your heads and cpu when they arrive. I will replace the system.

Thanks
 
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Vancity23

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Hi everyone! I've been dead for awhile and that's because work is that way sometimes. However, I currently had a second CPU failure, and I thought I'd make a thread on my thoughts of the sytem overall and some tweaks that should be made to improve it overall.

So, to start off, the filtering on the CPU is sub-par for a device that is so sensitive. What I mean by this is that if we look back at the pictures I posted of the inside of the CPU, it has one, 1000uF 25V capacitor to use to filter out transient noise. However, I'm pretty sure that's not going to do it for people who have vehicles like me. I have a custom sound system with an android radio and external amplifier, plus I have LED lights all over my vehicle. Also, I drive a diesel. Why does that matter? Common Rail (CR) diesel vehicles use a single high pressure fuel pump to provide around 1500-2000PSI (on passenger vehicles with smaller diesels) to the injectors. These injectors need exceptionally high current to open as they are fighting much higher pressures. This also means the voltage spike that comes off of these is going to be MUCH higher than a normal injector.

Now, as you guys might know, I drive a Volkswagen. Why is this an issue for this particular topic? The alternator goes through an electrical bus, through a fuse, to the battery. That means that the noise from the alternator will reach most of the electronics in the car before it can be buffered out by the battery. This is a major concern for those of us running jammers in VWAG vehicles, as most of them are like this.

Now, if we read the TMG manual, we see that they say to uncoil the wire when bench testing as the magnetic field can compromise the performance of the jammers. This is an issue for anyone who decides to route their cables through a body harness grommet in their vehicles. Lots of signals for many things flow through those wires, all of them generating a magnetic field. The TMG cables need to have a grounded sheath around the shielding they already have. Large electromagnetic fields can easily penetrate a shield, even if it's made top tier. An easy solution to this is having a ground connected at each end of the head wiring to fix this, or use a thicker shield that can dissipate through the CPU ground.

Another issue that I saw that other users had is with the volume buttons. While I never touch my CPU enough to warrant the volume being changed, I will note that the design is direct contact from the trim plates to the switch. A pressure limiting spring should be added in-between the switch to limit the pressure applied so it cannot damage the switches in a manner that will damage them beyond repair.

Also, the volume of the speaker is on the low side. If I am 100% blasting my radio, there's no way I'm going to hear my CPU over the radio. A more powerful amplifier should be used with a slightly larger speaker.

Now, I know a lot of users are going to say, "Hey, but this will make the CPU more expensive!"

In reality, it should have 0 effect on cost. The circuit board currently in use, in the same size can be used. The only difference is the switches would have to be moved back about 5/32nds of an inch, and the capacitor would have to be mounted straight, also moved about 5/32nds inwards. A small filtering choke can then be added to filter out high voltage ripple on the incoming supply, and springs can be added to the switches. A 5w speaker compared to a 3w speaker with a slightly larger amplifier IC shouldn't add much to cost. However, if for some reason it is necessary to raise the pricing, I would expect no more than $10 in an increase. Keep in mind, this is what I would assume considering TMG would be sourcing all parts and modifications necessary at extremely low cost due to them getting them at manufacturer pricing. I could be completely wrong, but in my experience with manufacturing, these parts shouldn't cost much at all.
Wow impressive comments man what is background, some type if electrical engineer or something?

I have a Tmg 3 head system in my 2018 Bmw M2, and it has a ton of electronics with wireless apple car play and charging, and optional mperformance exhaust with BT remote to open the exhaust flaps, and I have had no issues.
 

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I would run your 12v plug for power,instead of your hardwire. The 12v plug can handle much more electrical abuse,it does not even blow with a bad diode on my testing.
Is there something in the 12V cigarette lighter adapter itself that would contribute to this effect? Maybe a power conditioner or something like that? I would think if it’s just a regular empty plug, you could cut the connector off and use the wires for a hardwire. Unless it’s actually changing voltage, that is, like stepping down to 6V or 5V for example, but I don’t think that’s the case right?
 

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Is there something in the 12V cigarette lighter adapter itself that would contribute to this effect? Maybe a power conditioner or something like that? I would think if it’s just a regular empty plug, you could cut the connector off and use the wires for a hardwire. Unless it’s actually changing voltage, that is, like stepping down to 6V or 5V for example, but I don’t think that’s the case right?
No there usually isn't anything there. It'll be the same line as any other 12v line for the most part
 

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