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Thread starter Willsonman Start date May 19, 2007 1 Joined Jun 11, 2005 Messages 1,195 Looking at a solution for my case mod issue and am looking at a part that requires 24 volts. is there any way to place a series circuit to get this? Any other way to get 24V? 2 Joined Aug 12, 2005 Messages 3,679 You could be very very lazy and do a probably bad for everything involved ganging together of two 12V sources from the PSU. Other than that, I believe there are voltage multiplying/doubling circuits rectifiers maybe, but I haven't gotten that far yet in my studies. One of the other guys who usually eat these questions alive will probably post a better answer. Mohonri, cpenna, the other EE/CEs/electric guys. 3 Joined Apr 23, 2002 Messages 4,363 ATX power-supplies output +12V and -12V... just take the diff between these AS long as the resultant object didn't need to be reference to 0V AND you don't exceed the current-rating of the relevant rail -12V seems to always have lower power capability 4 Joined Jun 11, 2005 Messages 1,195 well, It will be powering a linear actuator... so not in use all the time. I imagine it will operate off 12V but at a decrease in lifting capacity. How would you wire up the +12V and -12V to get 24V? 5 Joined Oct 29, 2005 Messages 715 There is 24 VDC between the blue -12V and yellow +12V PSU wires. Your circuit cannot rely on the 24VDC being referenced to Ground however, and is only good for amps maximum. 6 Joined Jan 10, 2001 Messages 168 You could be very very lazy and do a probably bad for everything involved ganging together of two 12V sources from the PSU. Putting two molex 0V & 12V pairs in series in an attempt to get 24V is guaranteed to cause a bang. What current do you need? As said, the -12V rail is a low rating, read the PSU label for your figure. 7 Joined Oct 29, 2005 Messages 715 Another option which I have sucessfully used is a 12V DC-DC converter with an isolated output, powered from PSU 12VDC. If you need 24VDC referenced to ground connect the negative voltage output to your PSU +12VDC, and your load between PSU ground and the DC-DC converter positive output. 8 Joined Jul 29, 2005 Messages 5,770 No offense intended, but what movax is suggesting is a very good way to at a minimum blow a fuse in your power supply. Using the -12V rail from an older PSU is also not recommended, because the current rating is very low for that rail. The -12V rail was only used for negative signals on things like serial ports, not for actually powering anything. IMO, your best bet is to actually get a real 24V power supply that can source the kind of current you need. 9 FLECOM Modderator & [H]ardest Folder Evar Joined Jun 27, 2001 Messages 15,773 No offense intended, but what movax is suggesting is a very good way to at a minimum blow a fuse in your power supply. Using the -12V rail from an older PSU is also not recommended, because the current rating is very low for that rail. The -12V rail was only used for negative signals on things like serial ports, not for actually powering anything. IMO, your best bet is to actually get a real 24V power supply that can source the kind of current you need. i agree, most -12v rails on powersupplies are an afterthought at best... i wouldent really recommend using it for anything that is actually going to draw any current... just get yourself a small 24v switching supply from an electronics surplus place and hide it away somewhere and you should be good to go 10 Joined Jun 10, 2005 Messages 25,068 Up convert with a DC to DC converter. IT's the only way if your actuator draws more then .25a or so... I wouldn't trust it otherwise. What movax suggested will cause a major problem... so steer clear. I tried this once with USB ports... wanted to get 10v... It only works with batteries, and seperate sources of power. Since almost all 12v lines come from the same place in the PSU and all grounds go back to common you will get a big spark, and a fire. 11 Joined Jun 11, 2005 Messages 1,195 alright, I'm fine with a dc-dc converter. Anyone know where to get one that I would need? 12 Joined Oct 29, 2005 Messages 715 and are good sources for DC-DC converters. You'll want one that has an input voltage range that your PC can supply typically rated 9V-18V, and has an output current rating suitable for what you are going to power it's best to have some headroom... it you need 1 amp, buy one that has amp output, and MOST IMPORTANT... isolated output. As I touched on earlier, you would connect it like this for 24VDC referenced to PC power supply ground DC-DC converter + input to PSU +12V DC-DC converter - input to PSU Ground DC-DC converter + output to whatever you are powering DC-DC converter - output to PSU +12V Ground for whatever you are powering to PSU ground That will give you 24VDC to whatever you are powering. You'll want some filtering too or the output tends to oscillate. Put a 10uF capacitor across the input and across the output. 13 Joined Jan 24, 2006 Messages 1,171 What exactly prevents the OP from putting two 12V molex connectors into a series and then hookup to the load? 14 Joined Oct 29, 2005 Messages 715 You mean two 12V molex from a standard ATX power supply? The problem would be connecting yellow on one to black on the other, thus shorting out the power supply. 15 Joined Jan 24, 2006 Messages 1,171 You mean two 12V molex from a standard ATX power supply? The problem would be connecting yellow on one to black on the other, thus shorting out the power supply. Yeah I guess it wouldn't work because they have a common ground unlike a battery for example. But what about mains inside your house? You know how you have 220v for your appliances? IIRC they take two 120v lines and combine it into one so I guess it could work that way. 16 Joined Jul 29, 2005 Messages 5,770 Yeah I guess it wouldn't work because they have a common ground unlike a battery for example. But what about mains inside your house? You know how you have 220v for your appliances? IIRC they take two 120v lines and combine it into one so I guess it could work that way. There's a world of difference here between your computer PSU and your house mains. As in Westinghouse vs. Edison difference-the power in your computer is DC, while the mains is AC. You're right about how they get 240VAC in your house-there's typically actually two 120VAC lines and a neutral coming into your house. The two AC lines are 180 degrees out of phase, so the voltage difference between the two is 240V. But that's completely unrelated to what we're working with here. Except that we're still pushing electrons through metal wires.... 17 Joined Jan 24, 2006 Messages 1,171 There's a world of difference here between your computer PSU and your house mains. As in Westinghouse vs. Edison difference-the power in your computer is DC, while the mains is AC. You're right about how they get 240VAC in your house-there's typically actually two 120VAC lines and a neutral coming into your house. The two AC lines are 180 degrees out of phase, so the voltage difference between the two is 240V. But that's completely unrelated to what we're working with here. Except that we're still pushing electrons through metal wires.... Yes I know house mains are are AC while computers are DC but that doesn't mean you can't add up electrical sources in order to increase amperage or voltage. 18 Joined Jul 29, 2005 Messages 5,770 Yes I know house mains are are AC while computers are DC but that doesn't mean you can't add up electrical sources in order to increase amperage or voltage. It depends on how the electrical sources are built. Batteries and depending on phase AC power, yes. Wall-connected DC power supplies...it depends on how their wired. If they're properly isolated, then yes. But I wouldn't count on that being the case for a computer PSU, since the ground on the PSU is often connected to the case ground. It *might* be possible to get 24V using two PSUs, but I wouldn't count on it. I guess you could get a couple of el-cheapo PSUs and try it out. Just wear safety glasses . 19 Joined Oct 29, 2005 Messages 715 It *might* be possible to get 24V using two PSUs, but I wouldn't count on it. I have tried it... you get sparks. The DC-DC converter idea works though. I used a few when I needed -12V at amps for some computers at work. 20 Joined Jan 24, 2006 Messages 1,171 I have tried it... you get sparks. The DC-DC converter idea works though. I used a few when I needed -12V at amps for some computers at work. Yeah because they share a common ground. My idea would be to emulate that of house wiring where they have 1 common ground and 2 "hot". So I guess you'd hook up the two 12v molex connectors and then finish the circuit out to the ground. 21 Joined Jul 29, 2005 Messages 5,770 My idea would be to emulate that of house wiring where they have 1 common ground and 2 "hot". So I guess you'd hook up the two 12v molex connectors and then finish the circuit out to the ground. The reason you can "stack" the two circuits in your house is that one is the opposite voltage of the other. For AC, that's the same as being 180 degrees out of phase. The difference sinx - -1*sinx = 2sinxgives you twice the voltage difference. We don't have that same luxury with a DC PSU. If the second rail were -12V, then sure, we could connect the two grounds together and get 24VDC out. But both of the rails are +12V with respect to the same ground. If I'm understanding you correctly, you're suggesting that you could tie the 12V line from one molex connector to the GND line of another molex connector, and that the "12V" line on the second connector would then be at 24V relative to the GND of the first connector. Is that what you're suggesting? If so, please don't try it. Since the 12V lines from both molex connectors come from the same solder pad inside the PSU, and the GND lines also come from a common solder pad, if you connect one 12V line to a different GND line, you're shorting out the PSU. 22 Joined Jan 24, 2006 Messages 1,171 The reason you can "stack" the two circuits in your house is that one is the opposite voltage of the other. For AC, that's the same as being 180 degrees out of phase. The difference sinx - -1*sinx = 2sinxgives you twice the voltage difference. We don't have that same luxury with a DC PSU. If the second rail were -12V, then sure, we could connect the two grounds together and get 24VDC out. But both of the rails are +12V with respect to the same ground. If I'm understanding you correctly, you're suggesting that you could tie the 12V line from one molex connector to the GND line of another molex connector, and that the "12V" line on the second connector would then be at 24V relative to the GND of the first connector. Is that what you're suggesting? If so, please don't try it. Since the 12V lines from both molex connectors come from the same solder pad inside the PSU, and the GND lines also come from a common solder pad, if you connect one 12V line to a different GND line, you're shorting out the PSU. You say that you can do that with AC because they're 180* out of phase, but wouldn't they be perfectly within phase if they both come from the same panel? My electrician says you take two 10gauge lines, combine the hot and then you'd have 220v. But since they both come from the same panel, I don't see how they'd be out of phase like you're saying. 23 Joined Jul 29, 2005 Messages 5,770 You say that you can do that with AC because they're 180* out of phase, but wouldn't they be perfectly within phase if they both come from the same panel? My electrician says you take two 10gauge lines, combine the hot and then you'd have 220v. But since they both come from the same panel, I don't see how they'd be out of phase like you're saying. They may come from the same panel, but they're not the same source. In order to get both 120V and 240V, you have to run three wires into the house a common neutral and two AC lines, which are 180 degrees out of phase with one another. Those two 120V lines then feed different circuits for most things in your house. Around half the circuits will be on one and half on the other, all of them connected to 120VAC on one end and the common neutral at the other. Where there is a need for 240V, the plug is wired to one 120VAC line on one side and the other 120VAC line on the other. The difference between those two lines gives you 240VAC. I don't know exactly what words your electrician said, but you might be misunderstanding them. In a way, yes, you're combining the two "hot" wires, I guess. 24 FLECOM Modderator & [H]ardest Folder Evar Joined Jun 27, 2001 Messages 15,773 You say that you can do that with AC because they're 180* out of phase, but wouldn't they be perfectly within phase if they both come from the same panel? My electrician says you take two 10gauge lines, combine the hot and then you'd have 220v. But since they both come from the same panel, I don't see how they'd be out of phase like you're saying. if you look at your panel you will see that there are two hots, and the "dual" breakers for your 240v lines are taking one from each hot... you cant take two lines from the same hot and get 240... you would get 0 between them actually, since they are in phase... 25 Joined Oct 29, 2005 Messages 715 Can we back this thread up to about post 14? 26 Joined Jun 11, 2005 Messages 1,195 I agree... but I figured out another way to do what I want to do and it no longer involves trying to get 24V. Shall I just close the thread? 27 Joined Jul 29, 2005 Messages 5,770 I agree... but I figured out another way to do what I want to do and it no longer involves trying to get 24V. Shall I just close the thread? Care to share what you did to make it work? no need to close the thread, just let it die on its own 28 Joined Jun 11, 2005 Messages 1,195 Well, I was trying to make the doors in my Delorean worklog to open by themselves and hit a dead end as to what I should do. I found some linear actuators on ebay for cheap that ran off 24V. I was not liking the option just because it was too bulky and complicated not to mention pricey for what I was planning on doing. I found another way to lift the doors, hopefully. I just wanted to know if I could have made those linear actuators work before I bought them. Glad I did not actually. 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Dipasaran tersedia berbagi macam power supply variabel mulai dari versi analog hingga digital namun tentunya dengan harga yang lumayan cukup mengurus isi kantong heheh 😁.Pada artikel sebelumnya saya telah membuat beberapa rangkaian yang boleh dibilang bisa sebagai power supply variabel analog karena memang memiliki kemampuan yang dapat mengatur tegangan keluaran secara variabel dan telah saya gunakan sejak lama untuk menemani kegiatan eksperimen proyek-proyek elektronika ringan sebelumnya dengan arus yang cukup sedang yaitu maksimal 3A dengan pengaturan tegangan melalui potensiometer maksimal 15V. Baca juga Membuat Power Supply Variable PSUKIT 0 - 30V Karena dirumah saya mempunyai beberapa koleksi atx psu atau power supply komputer dan sudah lama tidak digunakan maka saya akan mencoba memodifikasinya menjadi power supply variabel mengingat sudah banyak artikel diluaran sana yang sudah memodifikasi power supply komputer ini menjadi dapat diatur keluarannya tidak ada salahnya saya pun mencobanya. Dari beberapa power supply komputer yang saya milik ada dua buah yang memakai ic pwm tl494 atau ka7500. Kenapa harus yang memakai ic tl494? Ya alasan utamanya adalah karena sangat mudah untuk dilakukan modifikasi sebab ic tl494 memilih dua buah error amplifier didalamnya yang akan digunakan sebagai pengatur tegangan dan arus keluarannya. Skema ATX-300P4-PFCModifikasi yang dilakukan hanya pada kedua pin error amplifier tersebut yaitu pin 1 dan pin 2 serta pin 15 dan pin 16. Pin 1 dan pin 2 digunakan sebagai pengaturan tegangan dimana pin 1 digunakan sebagai limit dan pin 2 digunakan sebagai set tegangan sementara pin 15 dan pin 16 digunakan sebagai pengaturan batas arus dimana pin 15 digunakan sebagai set arus dan pin 16 digunakan sebagai limit arus. Satu lagi agar psu atx tidak protek saat tegangan keluaran lebih dari 12 V maka pin 4 Dead Time harus dimatikan atau diputus dari rangkaian proteknya, jadi pin 4 harus 0V. Dengan mematikan pin 4 maka keluaran dari psu atx ini mampu diatur sampai 25 V dengan demikian elko bagian sekunder harus diganti karena memiliki rating tegang maksimal hanya 16V, diganti dengan elko yang mempunyai rating tegang maksimal 50V. Kemudian rangkaian protek dan komponen lainnya pada bagian sekunder harus dilepas agar tidak pusing dalam melakukan modifikasi. Dibawah ini saya tampilkan skema mana saja yang perlu dimodifikasi dan komponen mana saja yang bisa dibuang. Modifikasi ATXPSU IC TL494 Jika akan melakukan modifikasi sederhana, yaitu hanya menambah dua potensio untuk pengaturan tegangan dan arus maka skemanya akan saya tampilkan seperti berikut ini. Modifikasi ATXPSU adjustable Namun saya tertarik membuat modifikasi dengan tampilan lcd 16x2 dan rotary Encoder sebagai pengatur tegangan dan arusnya setelah saya melihat sebuah video di youtube. Dibawah ini adalah sebuah rangkaian kontrol untuk mengatur pin dari error amplifier ic tl494 atx psu. Skema kontroler ATXPSU adjustable Skema diatas saya rancang menjadi sebuah layout yang menarik namun saya rancang dalam dual layer karena saya tidak akan membuat PCB sendiri seperti sebelumnya karena saat ini sudah ada pabrik pembuatan pcb profesional yang dapat membuat PCB dengan kualitas premium namun dengan harga yang terjangkau yakni hanya $5 saja sudah bisa mendapatkan 10 lembar pcb ukuran 10cm x 10cm dengan proses yang cepat dan berbagai pilihan warna menarik, saya mencetak pcb di situs PCBWay. Oh iya jika kamu belum pernah pesan pcb di PCBWay maka apabila kamu mendaftar akun PCBWay untuk pertama kalinya dan melakukan pemesanan maka kamu akan diberikan kredit gratis sebesar $5 untuk pembayarannya jadi pesanan pcb pertamamu di PCBWay adalah Gratis! Jadi tunggu apa lagi segera daftar akun PCBWay sekarang juga. Daftar akun PCBWay Klik join untuk daftar akun PCBWay Nah inilah layout kontroler ATXPSU adjustable yang telah saya rancang. Dibawah ini adalah pcb kontroler ATXPSU cetakan dari PCBWay. Kontroler ATXPSU adjustable bagian ATXPSU adjustable bagian saya rakit dan dimasukan kedalam Cashing maka tampilan nya lebih menarik. DIY Lab Bench Power Supply from Old ATX PSUPenasaran kan melihat hasilnya, untuk itu mari kita simak video pembuatan, kalibrasi hingga tesnya yang menampilkan tegangan secara akurat. PSU atau Power Supply Unit merupakan salah satu komponen penting dalam sebuah komputer. PSU berfungsi untuk mengubah arus listrik AC menjadi DC yang dibutuhkan oleh komponen-komponen dalam komputer. Namun, terkadang kita membutuhkan arus listrik DC dengan voltase yang lebih tinggi dari 12 volt yang biasanya disediakan oleh PSU standar. Pada artikel kali ini, kita akan membahas cara modifikasi PSU komputer menjadi 24 volt. Peringatan Sebelum melakukan modifikasi PSU komputer, ada beberapa hal yang perlu diperhatikan. Pertama, modifikasi ini harus dilakukan dengan hati-hati dan oleh orang yang berpengalaman dalam bidang elektronik. Kedua, PSU yang dimodifikasi hanya boleh digunakan untuk keperluan yang sesuai dengan kemampuannya dan tidak boleh digunakan untuk keperluan lain yang dapat membahayakan keselamatan dan keamanan. Bahan-Bahan yang Dibutuhkan Sebelum memulai modifikasi, pastikan Anda sudah menyiapkan bahan-bahan yang dibutuhkan. Berikut adalah beberapa bahan yang biasanya dibutuhkan PSU komputer Transformator step-up Diode bridge Kapasitor elektrolitik Resistor Terminal blok Kabel listrik Heat sink Langkah-Langkah Modifikasi Berikut adalah langkah-langkah untuk melakukan modifikasi PSU komputer menjadi 24 volt Buka casing PSU komputer dan keluarkan PCB PSU dari casing. Identifikasi komponen-komponen pada PCB PSU. Cari tempat yang cocok untuk memasang transformator step-up. Solder transformator step-up pada tempat yang telah Anda tentukan. Solder diode bridge pada PCB PSU. Solder kapasitor elektrolitik pada diode bridge. Solder resistor pada diode bridge. Solder terminal blok pada PCB PSU. Solder kabel listrik pada terminal blok. Pasang heat sink pada komponen-komponen yang memerlukan pendinginan ekstra. Keuntungan Menggunakan PSU Komputer yang Sudah Dimodifikasi Ada beberapa keuntungan yang dapat Anda peroleh dengan menggunakan PSU komputer yang sudah dimodifikasi menjadi 24 volt Anda dapat menghemat biaya karena tidak perlu membeli PSU baru yang sudah mendukung voltase 24 volt. Anda dapat menghemat ruang karena tidak perlu menambahkan PSU baru pada sistem Anda. Anda dapat meningkatkan performa sistem Anda dengan menggunakan voltase yang lebih tinggi. Kesimpulan Modifikasi PSU komputer menjadi 24 volt dapat dilakukan dengan hati-hati dan oleh orang yang berpengalaman dalam bidang elektronik. Modifikasi ini dapat memberikan beberapa keuntungan seperti menghemat biaya dan meningkatkan performa sistem. 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modif psu komputer jadi 24 volt