Build Thread:MS76

[timpanic]

OKAY WE HAVE A WINNER HERE! After mounths of troubleshooting I soldered one bf245 out of a working mono G1176 and voila the problem is gone!!!!
So all the bf245 and 2n5457 I ordered from ebay or banzaimusic berlin have some leakage. So where can I get some working FETs right now ?

 

[Gustav]

OKAY WE HAVE A WINNER HERE! After mounths of troubleshooting I soldered one bf245 out of a working mono G1176 and voila the problem is gone!!!!
So all the bf245 and 2n5457 I ordered from ebay or banzaimusic berlin have some leakage. So where can I get some working FETs right now ?

2N5457 - available at Mouser.
Mouser No:
610-2N5457

 

[timpanic]

2N5457 - available at Mouser.
Mouser No:
610-2N5457

https://groupdiy.com/threads/releas...-r-pointer-any-help.81692/page-2#post-1092158

 

[samgraysound]

Hello,

Someone recently handed off a partially completed MS76 project to me without any documentation. Does anyone have any of the original documentation? It is not on the PCBgrinder website anymore.

Sam

 

[Gustav]

Hello,

Someone recently handed off a partially completed MS76 project to me without any documentation. Does anyone have any of the original documentation? It is not on the PCBgrinder website anymore.

Sam

I have been busy with other work, and left the few PCB orders coming in to my son to take care of as a learning experience. I also gave him free hands to play around with the website, so he can learn, how that works, and it looks like he deleted the reference to the google drive folder by mistake :/

Ill sit down with him and take care of it over the weekend.
I also see there's a message about the mailserver doing odd things up, but he did solve that one with the host, so needs an update in any case.

Note for the build. At the time of designing this, I had gotten the idea that I should be avoiding elcos whenever possible. I never had issues on a build, but its obvious from the thread and the troubleshooting feedback, that implementing the (standard) 10uF on the output of the regulators instead of he 1uF polyester I used in the design clears up about 99% of head-scratchers. With the 1uF, the supply is only marginally stable, causing ripple on some builds, and while I haven't looked into the variables, its probably things like cable lengths and cleaning up soldering.

In any case, its rock solid if you drop in a 10uF, and it will not sound different - was just pursuing a foolish aim

Gustav

 

[samgraysound]

Hi Gustav,

Thanks for the reply and the advice about the power supply cap. I'll look for the documents on the website next week.

Sam

I have been busy with other work, and left the few PCB orders coming in to my son to take care of as a learning experience. I also gave him free hands to play around with the website, so he can learn, how that works, and it looks like he deleted the reference to the google drive folder by mistake :/

Ill sit down with him and take care of it over the weekend.
I also see there's a message about the mailserver doing odd things up, but he did solve that one with the host, so needs an update in any case.

Note for the build. At the time of designing this, I had gotten the idea that I should be avoiding elcos whenever possible. I never had issues on a build, but its obvious from the thread and the troubleshooting feedback, that implementing the (standard) 10uF on the output of the regulators instead of he 1uF polyester I used in the design clears up about 99% of head-scratchers. With the 1uF, the supply is only marginally stable, causing ripple on some builds, and while I haven't looked into the variables, its probably things like cable lengths and cleaning up soldering.

In any case, its rock solid if you drop in a 10uF, and it will not sound different - was just pursuing a foolish aim

Gustav

 

[fragletrollet]

Noticed the docs still missing from the site. Here's my backup: Ms76 files

 

[Geert Samuel]

These were only sold as kits, and when I stopped those sales, I offered the spare boards. There were about 10, and I found a pile of another 20 when I cleared out the PCB storage. I dont think there is a huge need for a shared BOM based on that.

To try and help you.

1. 2 x 10K lin will do.
2. You are correct, it sets the SC HP. Its rather high "stock", but you can change as you wish.
3. They are just neutrik PCB mount XLRs.
4. Yes - 4003 is fine throughout.
5.You can use both.
6. No idea - youd have to try, but again, we dont really need a public BOM, so just find the 2n5457 for your build, and dont worry about universal availability.
7.Up the trimmer values a little - next step in line will be fine.
8. As long as the minimum voltage and amperage rating are fine, you will be fine. Your mentioned part is rated 800V, 1.5a, which is more than enough.
9.Lay board on bottom of case, punch markers, and drill, if you want to add support studs.

Gustav

Hi Gustav,

On question 4 he asked if 1n4004 is ok. And you answered, yes 4003 is fine throughout.

Now that I ordered the bom placed here, I have plenty of 1n4004…and used them.
Should I replace them with the 4003? Or are the 4004’s ok?

 

[Gustav]

Hi Gustav,

On question 4 he asked if 1n4004 is ok. And you answered, yes 4003 is fine throughout.

Now that I ordered the bom placed here, I have plenty of 1n4004…and used them.
Should I replace them with the 4003? Or are the 4004’s ok?

1N4004 are fine - its just a max voltage rating.

 

[c1184701]

Hi @Gustav, do you recall the model of VU meter that came with the MS76 kits? One of my LEDs has gone a bit dim and I need to replace it.

 

[Geert Samuel]

Hi @Gustav, do you recall the model of VU meter that came with the MS76 kits? One of my LEDs has gone a bit dim and I need to replace it.

If you open the unit, you should see the part number, right?

I believe the model nr is TR-57-S0346 but as I still need to order that part, I’m not 100% sure.

Can be found at electronic parts websites, amazon and even aliexpress.