carlsson
Veteran Member
This is the continuation of the thread I started here:
http://www.vintage-computer.com/vcforum/showthread.php?t=4101
Initially I only meant to post about the PC cluster, but turned out the little power supply was more interesting. Therefore I decided to start a new thread as the forum software doesn't have a function to let a user reply to a thread but put his answer in another group - that is exclusively a moderator privilege.
I have a complete Mac LC475. I could try to measure its power supply to see if it fluctuates as much or if this loose one is fishy.
I tried to record it as loud as possible, and then filter away all the other noise. The end result sounds like a bubbling aquarium, but anyone interested can clearly hear the rate of ticking.
http://www.anders.sfks.se/mp3/ticking.mp3
Oh, and .. after powering it off, it takes a long time before the ticking slows down and stops completely. At one point in the slow down, it starts ticking at double speed (!) and then slows down again from there.
http://www.vintage-computer.com/vcforum/showthread.php?t=4101
Initially I only meant to post about the PC cluster, but turned out the little power supply was more interesting. Therefore I decided to start a new thread as the forum software doesn't have a function to let a user reply to a thread but put his answer in another group - that is exclusively a moderator privilege.
What is the difference of rapid and random? The digital multimeter reads out values that don't follow a certain pattern. I compared with the original 1541-II PSU, which outputs perfectly stable voltages.When you check the DC output with your voltmeter, do the voltages vary rapidly, or is it kind of random?
I have a complete Mac LC475. I could try to measure its power supply to see if it fluctuates as much or if this loose one is fishy.
I tried to record it as loud as possible, and then filter away all the other noise. The end result sounds like a bubbling aquarium, but anyone interested can clearly hear the rate of ticking.
http://www.anders.sfks.se/mp3/ticking.mp3
Oh, and .. after powering it off, it takes a long time before the ticking slows down and stops completely. At one point in the slow down, it starts ticking at double speed (!) and then slows down again from there.
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