Actually, its worse! There are two class A amps in the bedroom. They dont run at the same time. If for some reason I want to run TV in there on hi fi, Wayne's 2018 line stage and Original F5 (right now) to speakers. TV on far side. Other side has streamer, turntable, DAC to Iron Pre and right now, F5m has taken M2 place, which has speaker leads to same pair of speakers...just plug in set needed! Its a sickness. We havent got to livingroom, where yup, two systems again, one at each opposing side of living room. More room so they each have their own speaker set.
Russellc
Hello i 'm very beginer i have make the build only with the picture that you have made can you tell me if all is ok?
i have not start it can you tell where i have to make the first mesurement to settle it?
thanks in advance
i have not start it can you tell where i have to make the first mesurement to settle it?
thanks in advance
Best to read the attachments by Mr Pass in the first post. It appears that you have multi-turn pots installed, so perhaps others can advise on the initial settings for these.
I see that I've messed-up my reply but anyways...
I see that I've messed-up my reply but anyways...
It is OK to be a beginner.
I see a few things that cause me some concern, but it could be my difficulty following the wiring. I would not worry about setting up the amplifier boards yet.
You must confirm that you have the proper DC voltages coming from your power supply.
I would disconnect the amplifier boards from the power supply and check this first.
If you can say with 100% certainty that you have already done this, and that it is correct, please tell us.
That's the name of the album. I forget who suggested it, but excellent recording of string instruments of all sorts.
This is the album/CD:
Attachments
I'm a beginner also, but the two things I see that could be real show stoppers are:
1) You have your mains AC wires routed through the 4mm holes on the base plate, which have no grommets to protect them from the sharp edges of those holes. You need to remove any possibility of the insulation on those wires getting cut, other wise one day you may have a live chassis, and that will be a very bad day. As much as it will be a massive pain at this point, I would be detaching those wires, drilling out the relevant holes to 8mm or so, and inserting a rubber grommet.
2) As @Logic800 has mentioned, the trim pots you have are not the BOM ones (neither are mine), and so they may turn opposite to the build instructions. You want them to start at 0 ohms, but if they turn up counter clockwise, you'll find following the 'turn the trimmers full CCW" instruction will actually set them to 1k Ohm and immediately fry your amp. If you scroll back a page or so there are some posts detailing how to check this.
Other things are less critical (like twisting wires), but if you do disconnect the amp boards from the power supply to test the power supply voltage as mentioned above, just realise that the power supply board will hold a charge without a load connected. You may need to a) wait a long while, or b) use a discharge device, before reconnecting it. Either way use a multimeter (carefully) to check it's discharged before you reconnect it.
That's my understanding of what I see, anyway. Probably wait for the more knowledgeable to confirm. I also wouldn't take what I've said to be the only issues, just what I've seen. 🙂
@Pierrick59 : Please review the comments from members twofires, ItsAllInMyHead and Logic800.
I didn't see standoffs used so please check very carefully there aren't any shorts. This is for both the amp boards and the power supply PCB.
Post #2533 (https://www.diyaudio.com/community/threads/f5m-kit.408290/page-127#post-7902597) should help you verify that the trimmers are set at the desired initial 'low' positions.
I didn't see standoffs used so please check very carefully there aren't any shorts. This is for both the amp boards and the power supply PCB.
Post #2533 (https://www.diyaudio.com/community/threads/f5m-kit.408290/page-127#post-7902597) should help you verify that the trimmers are set at the desired initial 'low' positions.
As mentioned above check the grounding situation first, with better pictures to ensure wires will not be cut.
You did not mention if you have already tested PSU by itself without connecting them to the amp boards.
If you haven’t, using your soldering iron, apply it to the v+\v- and GND and remove the wires from amp boards.
Next you will need to test PSU first. I would go in depth here but there are a few series of test you must complete before powering amp boards for first time, best to complete those steps before hand, and prevent the magic smoke.
During my build I also tested the voltage on the rectifier before connecting to PSU.
Long story short, several steps before even considering powering your amps boards.
Although the guide is meant for the AJZM, the psu is similar to the F5M…
https://guides.diyaudio.com/Guide/Aleph+Jzm+Amplifier/25?lang=en
Follow after step 53, and of course if unsure, don’t hesitate to ask.
Best,
Jose
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@Pierrick59 - I am back at a computer, and I had a few minutes to review some posts above. Everyone is providing excellent advice, but I would first disconnect your amplifier boards and ensure that your PSU is working properly. As mentioned, I see a few things of concern. Do you have a dim bulb tester and/or a variable transformer?
One concern (if my vision is not fooling me or the photo) is captured below in red.
Note below from the upcoming F5m build guide. It will be out .... soon.... maybe before the end of this week. Note the bold underline text and the markings on the rectifiers. I cannot tell with certainty, but I think your transformer secondaries are not connected to the rectifiers properly. It could be the photo, but that's why I asked you to confirm if you had checked your power supply before connecting your amplifier boards.
One concern (if my vision is not fooling me or the photo) is captured below in red.
Note below from the upcoming F5m build guide. It will be out .... soon.... maybe before the end of this week. Note the bold underline text and the markings on the rectifiers. I cannot tell with certainty, but I think your transformer secondaries are not connected to the rectifiers properly. It could be the photo, but that's why I asked you to confirm if you had checked your power supply before connecting your amplifier boards.
Patrick, I think you're right. Now I that looked at the expanded photo on a computer, the rectifier connections do look suspect.
@Pierrick59 : Please disconnect the amp boards and thoroughly check the power supply board connections as suggested.
@Pierrick59 : Please disconnect the amp boards and thoroughly check the power supply board connections as suggested.
thanks to all for your help
nice shitty afternoon...
@ItsAllInMyHead i have not refresh my page i not see your message before.
first of all i have unweld amp cards and supply board they are safe
1 the fuse in the power supply burn
i check all and plug in a second time
2 the CL60 smoke...
i have change the branchement method and
3 the rectifiers were not correctly connected and have start smoke.... i think i have to order back
nice shitty afternoon...
@ItsAllInMyHead i have not refresh my page i not see your message before.
first of all i have unweld amp cards and supply board they are safe
1 the fuse in the power supply burn
i check all and plug in a second time
2 the CL60 smoke...
i have change the branchement method and
3 the rectifiers were not correctly connected and have start smoke.... i think i have to order back
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^ I'm sorry to hear that. Pause and do not apply power again until we are able to help.
I was hoping that you had a variable transformer and/or a dim bulb tester to use. That would have allowed us to go through your build in a step-by-step manner and apply power "gracefully" to ensure a safe power up sequence.
I will try to get back on this evening, but in the interim, I am sure the wise members here can tell you what to look for. They have already called out some specifics (like standoffs) that could contribute to your issues.
Please do this -
With the amplifier boards still disconnected, please take a few more pictures trying to show your PSU from all angles.
I was hoping that you had a variable transformer and/or a dim bulb tester to use. That would have allowed us to go through your build in a step-by-step manner and apply power "gracefully" to ensure a safe power up sequence.
I will try to get back on this evening, but in the interim, I am sure the wise members here can tell you what to look for. They have already called out some specifics (like standoffs) that could contribute to your issues.
Please do this -
With the amplifier boards still disconnected, please take a few more pictures trying to show your PSU from all angles.
Double check, triple check, then check again. Electronics doesn't work at all unless it's 100% correct.
One rule that I have always followed: verify proper operation of the power supply in stages throughout the build.
First, AC inlet wiring (to fuse as applicable; and to chassis earth); then through any conditioning such as surge protectors and EM filters; then to switches and thermal breakers; transformer out; then rectifiers, then each stage of c and r or l. Then finally to where power is distributed to the applicable audio and control circuitries.
Of course, that does not fundamentally deal with mistakes such as not using standoffs for PCBs.
First, AC inlet wiring (to fuse as applicable; and to chassis earth); then through any conditioning such as surge protectors and EM filters; then to switches and thermal breakers; transformer out; then rectifiers, then each stage of c and r or l. Then finally to where power is distributed to the applicable audio and control circuitries.
Of course, that does not fundamentally deal with mistakes such as not using standoffs for PCBs.
First - Do not be discouraged. These things can happen. I am happy you were not hurt. Parts can be replaced. You cannot.
May we frankly ask - Is this your first project using a linear supply and connected directly to mains power?
I can tell from your photo that you took pride in your project. To me that means you made a lot of effort and were careful. You likely have some small, but important error(s) that we can fix with a small effort.
Take some photos of the project as it exists now. It should only be the power supply with amplifier boards removed.
Take photos at angles that show all sides of the PSU clearly. Is there a reason you did not use the little "Mains hookup board" that came with the PSU?
PM me, and I will give you 'early access' to the build guide. It is always wonderful to have a new builder read things and share what they may find confusing. Also, you can help me if my English does not translate well for you. This is always a concern with an international audience for build guides. We can work together as a group to get your amplifier working properly.