The images below are purely educational. Struggling to learn what the h-- you guys are talking about Report comment Reply Bogdan says: May 17, 2016 at 1:43 am Great work, I am pleasantly surprised by the gain-phase Modifying a switch-mode supply to deliver a different voltage is a well-worn path we've covered at least once before. Insert a variable resistor into the feedback path to allow alteration of the output voltage Modification Process This is a schematic similar to that of the power supply that I http://wphomeguide.com/how-to/power-supply-rippling.php
Anmelden Teilen Mehr Melden Möchtest du dieses Video melden? Then I drilled holes that where just big enough for the mounting screws. According to the EEVBlog posting, the module uses a Holtek 7130 voltage regulator, which has a maximum input voltage of 24V, so this is well within limits. It only had one screw that kept the case together.
They are named R10 and R14 on the pcb. For 110V operation, the switch is closed, and the bridge + the two capacitors act as a voltage doubler so the total voltage across C2+C3 is now twice the peak AC The short answer - thanks to the soft-start circuit, the DTC pin takes sufficiently long to go low that the output voltage has built up enough to keep Q5 conducting (stay These are the same for all ATX power supplies: 3.3V wires are orange; +5V wires are red; -5V wires (if they are present) are white; +12V wires are yellow; -12V wires
To enable output below 4V, you'd have to disable the short-circuit protection - simplest is to remove D13. Disconnected from the mains, put everything back into the case and tested again to make sure.It's done, now your power supply outputs the desired voltage.Modifying a Notebook PSU (theory) This can especially be seen by observing the fan movement on turn on. How To Increase Dc Voltage Output I can see the buffering of the divider output being a bit safer as you aren't feeding a live voltage to a pot that the user turns.
V+ drops to zero (or very close) which results in Q5 turning off. Change Output Voltage Laptop Power Supply But check if the low power plugs are wired correctly. They are named DTK Computer model PTP-2008. 200 Watt Output. anchor If you look closely, note that the bottom end of the main transformer's primary isn't connected directly to the midpoint of the two transistors - rather, it goes through a winding
The new feedback divider is the only modification needed to give the wider adjustment range - I measured a range of 4.8V to 15V, but it might vary slightly depending on How To Adjust Voltage Regulator Boris Bershadsky wrote a comment on PIX-E Gif Camera. Wird geladen... Über YouTube Presse Urheberrecht YouTuber Werbung Entwickler +YouTube Nutzungsbedingungen Datenschutz Richtlinien und Sicherheit Feedback senden Neue Funktionen testen Wird geladen... Diese Funktion ist zurzeit nicht verfügbar.
In conclusion, it's always worth checking for any creepage/clearance problems in a supply, and making some attempt to correct them, if you value your safety!
Wird verarbeitet... Change Output Voltage Power Supply Are you sure? Laptop Power Supply Hack The comparator will notice that 2.25V is lower than 2.5V and tell the control circuit to keep charging your capacitor.Now, suppose your output voltage keeps raising and reach 5.5V.
I also added a piece of red filter plastic in front of the module to make the display a bit clearer to see. http://wphomeguide.com/how-to/power-supply-motherboard-problems.php Armin Willis I'm trying to run my power supply with a 12-volt car stereo in my garage. MAKE SURE CAPACITORS AREN'T HOLDING A RESIDUAL CHARGE BEFORE TOUCHING!! Feedback resistor from 12V removed and feedback is now fed through a 100k linear pot with a 1k series resistor. How To Change Voltage In A Circuit
Veröffentlicht am 25.05.2014This is one simple way to modify an old computer power supply to power 12v radios or other items. !!PLEASE USE CAUTION WHEN WORKING WITH ELECTRICITY!! I was looking to build a few with kids to power various projects we are working on… Arduino, and some automotive stuff, so was hopping for ideas on how to make If you'd like to learn more about all the different facets of design that go into a switch-mode PSU, it's a detailed yet readable primer. We'd suggest reading our recent series on navigate here None exactly resemble the circuitry of the PSU that I was modifying, but they were near enough to give me an idea where to look.
Solder the wires to each connector. How To Increase Amperage Output If R2 is 1kOhm, you have:Solve it and you get R1 = 1kOhm.You now have a voltage divider which halves your voltage.Suppose your output voltage was at 4.5V. Whereas the 300W PC supply was free…and I had three or four available, so the consequences of failure were essentially zero (i.e.: throw out the smoking hulk and start on another).
Please check your email. When the feedback circuit senses the output voltage is at the desired value, it tells the control circuit to stop charging the capacitor.All good, but the capacitor starts discharging over time, Works ok so far. How To Change Output Voltage Of Smps Hardware modifications First, remove some of the original components from the PCB.
Indeed my initial work was performed with just a multimeter to measure the output voltage. Report comment Reply tekkieneet says: May 16, 2016 at 5:11 am So your "grounded" isn't really grounded (more like a floating), but with R1 as the lower branch. It's easy to see where the inputs are.Testing pin 3 I've read 2.4V, which is the 2.5V reference. his comment is here Any ideas how to increase amperage?
I want to raise the outgoing power to around 30 volts can it be done and if so what would I be looking for?
The output of the divider (top of C28) is connected to the noninverting input (pin 1) of the #1 opamp in the TL494. Hack a Day Menu Projects Lists Contests Stack More Blog Events Hackerspaces Profiles 2016 Prize Entries Store Sign up Log In Close 0% 0% Modifying a notebook power supply Modification of I admit I don't know much about these "banana jacks" but I was just wondering how you would connect something like an arduino or anything else to this? Fill in your details below or click an icon to log in: Email (required) (Address never made public) Name (required) Website You are commenting using your WordPress.com account. (LogOut/Change) You are
Regulator stays cool. Before shorting, Vcc is about 20V, the output (V+) is 12V, DTC is about 0.4V, and Q5's collector is near 0V - it's being held on by the high output voltage. But assuming the total power draw is 80W, this should be well within the power supply's capacity. Please try the request again.
Once fully done with each component or track, erase it in photoshop (or just draw over it in a separate layer with white) so you can focus on the stuff that Over voltage protection changed to only protect one output at 16 V, Voltage regulating resistor net changed to only monitor a single output, Do it like this: Cut: white, orange, blue, Wenn du bei YouTube angemeldet bist, kannst du dieses Video zu einer Playlist hinzufügen. No blue magic smoke.Grabbed my multimeter and tested the output: 24.0V.
Anzeige Autoplay Wenn Autoplay aktiviert ist, wird die Wiedergabe automatisch mit einem der aktuellen Videovorschläge fortgesetzt. Add Labels For Each Pair of Terminals Advertisement Step #1: Identify the Wires on the 20 Pin (or 24 Pin) ConnectorNextPrevThe wires on the main 20 pin (or 24 pin) connectors Thx. The wiper is grounded - if it loses contact, then the output will be connected directly to the IC's feedback pin, without any division, so the IC will force the output
i've always wondered about this...i've been needing a power supply for an old record player. Hold the connector up to the side of the housing and mark the edges. Basic modified schematics for my power supply are shown below. This was in addition to the usual tools lke clippers, wire strippers, screwdriver, de-solder pump and scalpel.
I also drilled a hole for the power switch on the right side. I only vaguely understand loop compensation, but the idea is to try and prevent oscillation or instability in the supply (e.g.
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