Thanks TA!
Yup, if I thought a little bit further, you can add a jumper at R4 and use the J2 source pad for the Austin IPS output(pin4). That will enable you to leave C4 on the main board and not populate C1 on the Austin IPS.
Easy peazy, all connections happen at the unpopulated M2 Jfet pads😉
Time expired to edit picture from Post#98
Yup, if I thought a little bit further, you can add a jumper at R4 and use the J2 source pad for the Austin IPS output(pin4). That will enable you to leave C4 on the main board and not populate C1 on the Austin IPS.
Easy peazy, all connections happen at the unpopulated M2 Jfet pads😉
Time expired to edit picture from Post#98
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Just a thought, but if you use sockets on the jfet pads (as I do, although for different reasons) then different daughter boards could easily be plugged and unplugged.
Exactly!
Like rolling an opamps 😉
I will have Cedarburg IPS boards available, should receive them next week.
Like rolling an opamps 😉
I will have Cedarburg IPS boards available, should receive them next week.
Prasi,
Great looking boards! As always, you provide nice gifts for all of us to build upon!
Cheers,
Greg
Great looking boards! As always, you provide nice gifts for all of us to build upon!
Cheers,
Greg
You are welcome Greg 
..
Vunce, njepitt, Anand ... all the best for your builds and experimentation.
..Vunce, njepitt, Anand ... all the best for your builds and experimentation.
Hi Prasi,
This is a very cool board. I don’t want to creat work for you bit perhaps in the future you can maybe have the board include the M2X format bolt holes as an option? While at it, add a 5th hole for ground and you can use the M2X boards that have gain which use a ground connection as well.
Mid that’s too disruptive, a simple 5pin 0.10in pitch header for optional ribbon cable to an external IPS can work too. Minimally invasive mod to an existing layout.
This is a very cool board. I don’t want to creat work for you bit perhaps in the future you can maybe have the board include the M2X format bolt holes as an option? While at it, add a 5th hole for ground and you can use the M2X boards that have gain which use a ground connection as well.
Mid that’s too disruptive, a simple 5pin 0.10in pitch header for optional ribbon cable to an external IPS can work too. Minimally invasive mod to an existing layout.
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Up and running!
Hi Everyone,
So after a few interruptions the amps are done, at least in provisional form. (Tweaks come later...) They sound great! Here are a few photos.
PSU is built in an old Apple case, as previously mentioned. I've set things out a little differently from the F3 version I posted about elsewhere, with the inductors hanging from the hard drive drawers. Seems to work nicely.
The amps themselves are in old heatsinks/supports that I uses years ago for an old F5 build. As was the case before, the heatsinks may turn out to be slightly small, but the jury is still out on that.
So far I'm very pleased; they sound great. Thanks again to Prasi for the board design, and of course to Nelson for the amp design.
Best
Nigel
Hi Everyone,
So after a few interruptions the amps are done, at least in provisional form. (Tweaks come later...) They sound great! Here are a few photos.
PSU is built in an old Apple case, as previously mentioned. I've set things out a little differently from the F3 version I posted about elsewhere, with the inductors hanging from the hard drive drawers. Seems to work nicely.
The amps themselves are in old heatsinks/supports that I uses years ago for an old F5 build. As was the case before, the heatsinks may turn out to be slightly small, but the jury is still out on that.
So far I'm very pleased; they sound great. Thanks again to Prasi for the board design, and of course to Nelson for the amp design.
Best
Nigel
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Nice work Nigel! It’s amazing how compact the amplifier can be with the power supply in a different zip code 😉
I made some progress on my M2 today, I’m going to install sockets in J1/J2 also. This will make future tweaking a breeze.
I made some progress on my M2 today, I’m going to install sockets in J1/J2 also. This will make future tweaking a breeze.
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I can't hear any hum, although I'm using the amps for the tweeters in a bi-amped system, and my transformer is far away. At some point I'll test it out more thoroughly, and I'll post any interesting results.
However I can certainly say that the TEKO covers look good, didn't cost much and arrived quickly, so why not use them? Is there some fancier alternative?
Best
Nigel
More M2 progress 🙂
Both M2 amp boards were powered up from my bench power supply and seem healthy. There is a lengthy delay and slow ramp up before the amp modules reach their working bias current.
Both amps were built exactly the same, but amp #1 draws 1.5A and amp #2 draws 1.32A??
Very close for music to flow.....
Both M2 amp boards were powered up from my bench power supply and seem healthy. There is a lengthy delay and slow ramp up before the amp modules reach their working bias current.
Both amps were built exactly the same, but amp #1 draws 1.5A and amp #2 draws 1.32A??
Very close for music to flow.....
Attachments
Looks good, Vunce! Nice chassis. 😉 It’s always exciting to get very close to completing an amp build.
I see you added a little fan to the SMPS. Are you targeting a specific component?
My similarly powered F5’s SMPS has been smooth and trouble-free since I first powered it on.
I see you added a little fan to the SMPS. Are you targeting a specific component?
My similarly powered F5’s SMPS has been smooth and trouble-free since I first powered it on.
Unique build Nigel, Glad to know you are happy with it.
and good progress Vunce..
You are welcome Extreme_Boky
and good progress Vunce..
You are welcome Extreme_Boky
Thanks von Ah and Prasi 🙂
Actually, Sami (MicroAudio) installed the fan. The hottest part of the SMPS is right where the fan is, so it’s well placed. My early impression is that it won’t be necessary powering the M2. But, with higher current applications the fan is nice to have.
Btw, the chassis is perfect for this project, thanks!
I left a huge open area towards the rear of the chassis to play around with added capacitance. I usually build my amps with dual mono PSU’s, since this is a single SMPS I’ll try adding two CRC filters between the output and each amp board. Lots of options here 😉
Actually, Sami (MicroAudio) installed the fan. The hottest part of the SMPS is right where the fan is, so it’s well placed. My early impression is that it won’t be necessary powering the M2. But, with higher current applications the fan is nice to have.
Btw, the chassis is perfect for this project, thanks!
I left a huge open area towards the rear of the chassis to play around with added capacitance. I usually build my amps with dual mono PSU’s, since this is a single SMPS I’ll try adding two CRC filters between the output and each amp board. Lots of options here 😉
meanie’s F6 build clearly shows the connection of extra filter caps as an example.
F6 Illustrated Build Guide
I did something similar with my F5. I may move up to dual mono filter banks, possibly stacked.
Pictures of your diy Pass amplifier
F6 Illustrated Build Guide
I did something similar with my F5. I may move up to dual mono filter banks, possibly stacked.
Pictures of your diy Pass amplifier