Re: Old analog Power Supply needs your advice
it looks like an unfinished home project. But there is quite a lot of room for a transformer and there is already a potentiometer to adjust something. i'll see what i can do anyway it doesn't looks bad. But the top cover is missing. one question: can anyone tell what those blue components are ?
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Re: Old analog Power Supply needs your advice
I'd guess a 20 to 25VAC transformer is missing, would connect to the purple wires.
The regulator is no good - there is no heatsink for the power transistors which will get really hot. I don't know why there are mica insulators under them. There is no short-circuit protection aside from the second fuse. The filter cap is dated 1978 so it might be no good. I would not salvage the board.
The panel meters are really nice, I used to sell Kyoritsu KM-66 by the bushel.
I would find a power transformer and put in a chinese "0-30V 0-2mA" regulator board to make something modern and get adjustable current.Leave a comment:
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Re: Old analog Power Supply needs your advice
2 bridge ones go to the missing transformerLeave a comment:
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Re: Old analog Power Supply needs your advice
The transformer is missing.Leave a comment:
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Old analog Power Supply needs your advice
Found this old ruined power supply that I've been tinkering with but there are three wires that I don't know their location. Your help is greatly appreciated. 2 wires coming from the bridge rectifier and the third blue one should be power carrying+ as I also don't know where to place itAttached Files -
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Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
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I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump
One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy... -
I have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails
I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time... -
The sub developed a constant popping every couple seconds from woofer and power LED flickering with nothing but wall AC connected. Connecting an audio cable didn't change anything. It doesn't play but a second or two of audio in between the pops.
Opened it up and discovered the power supply is making a faint clicking or ticking sound.
I measured the amp's output to the woofer and it pulses up to 50mv DC to be driver. The pulses coincide with the power supply ticking/clicking.
I measured the power supply output going to the amp board and it too has this pulsing. Voltage cycles... -
I have a 15 - inch Retina MacBook Pro from the mid - 2014 model. Here is the link: https://www.badcaps.net/forum/showth...light=820-3662 . The battery broke some time ago. After I removed the battery and plugged in the original power adapter, the MBP could boot up normally. However, when I checked with IntelPowerGadget, I found that the CPU speed was limited to 0.8 GHz, and it ran very slowly. Later, I found a solution on GitHub. There is an open - source project called cputune that can set the CPU running speed. So I can now run the MBP at full speed. But another problem...
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