Modifying the pcb board: The next s

Modifying the pcb board: The next step is to isolate the red +5 volt pad by cutting the pcp trace between the toroid core and the +5 Volt pad. Therefore you can apply a sharp screw driver in order to scratch away the copper surface. However never cut the thin pcb trace between the +5 volt pad and the input of the +5 volt voltage regulator.

How to insert the two resistors for the voltage devider on the pcb board:

AT power supply: Solder 18 ohms / 3 Watt between the yellow (+12 volts) and the red (disconnected +5 volts) pad. Solder 7,8 ohms / 3 Watt between the red (disconnected +5 volts) and the black (ground) pad.

ATX power supply: Solder 36 ohms / 2 Watt between the yellow (+12 volts) and the red (disconnected +5 volts) pad. Solder 18 ohms / 2 Watt between the red (disconnected +5 volts) and the black (ground) pad.

Of course you can adjust the output voltage by minor changes of the resistor values with the help of shunts.

Reversing the two rectifiers: In AT power supplies on the output side are placed two rectifier pairs of diodes. The bigger one is for +5 V and the smaller one is for +12 Volt. You can reverse both so that the bigger one can cope with the 20 ore more amps.

Another solution for ATX-PSUs: A different voltage divider serves as well and needs less current.

1. Between “red (5 volts)” and “black (ground)” I placed two 100 Ohm resistors in a parallel configuration.
2. Between “red (5 volts)” and “yellow (12 volts)” I placed one 2k2 and one 100 Ohm resistor in a parallel configuration.

The result was an output voltage of about 14.2 volts. See next picture. More details and pictures here.

Reducing the fan speed: Normally you don´t need the full speed of the fan. Therefore you can reduce the fan speed. I run the fan with 5 volts you get from the -5 volts power supply. A drop of of motor oil on the fan bearing reduces also the fan noise.

Cleaning the power supply: Used power pc power supplies are full of ugly dust and dirt. Take apart the power supply and wash it in a dishwasher before you modify it. After this treatment the power supply looks like a new one. I am not kidding. It works.

How to insert the two resistors for the voltage devider on the pcb board:

AT power supply: Solder 18 ohms / 3 Watt between the yellow (+12 volts) and the red (disconnected +5 volts) pad. Solder 7,8 ohms / 3 Watt between the red (disconnected +5 volts) and the black (ground) pad.

ATX power supply: Solder 36 ohms / 2 Watt between the yellow (+12 volts) and the red (disconnected +5 volts) pad. Solder 18 ohms / 2 Watt between the red (disconnected +5 volts) and the black (ground) pad.

Of course you can adjust the output voltage by minor changes of the resistor values with the help of shunts.

Reversing the two rectifiers: In AT power supplies on the output side are placed two rectifier pairs of diodes. The bigger one is for +5 V and the smaller one is for +12 Volt. You can reverse both so that the bigger one can cope with the 20 ore more amps.

Another solution for ATX-PSUs: A different voltage divider serves as well and needs less current.

1. Between “red (5 volts)” and “black (ground)” I placed two 100 Ohm resistors in a parallel configuration.
2. Between “red (5 volts)” and “yellow (12 volts)” I placed one 2k2 and one 100 Ohm resistor in a parallel configuration.

The result was an output voltage of about 14.2 volts. See next picture. More details and pictures here.

Reducing the fan speed: Normally you don´t need the full speed of the fan. Therefore you can reduce the fan speed. I run the fan with 5 volts you get from the -5 volts power supply. A drop of of motor oil on the fan bearing reduces also the fan noise.

Cleaning the power supply: Used power pc power supplies are full of ugly dust and dirt. Take apart the power supply and wash it in a dishwasher before you modify it. After this treatment the power supply looks like a new one. I am not kidding. It works.

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Modifying the pcb board: The next step is to isolate the red +5 volt pad by cutting the pcp trace between the toroid core and the +5 Volt pad. Therefore you can apply a sharp screw driver in order to scratch away the copper surface. However never cut the thin pcb trace between the +5 volt pad and the input of the +5 volt voltage regulator.How to insert the two resistors for the voltage devider on the pcb board:AT power supply: Solder 18 ohms / 3 Watt between the yellow (+12 volts) and the red (disconnected +5 volts) pad. Solder 7,8 ohms / 3 Watt between the red (disconnected +5 volts) and the black (ground) pad.ATX power supply: Solder 36 ohms / 2 Watt between the yellow (+12 volts) and the red (disconnected +5 volts) pad. Solder 18 ohms / 2 Watt between the red (disconnected +5 volts) and the black (ground) pad.Of course you can adjust the output voltage by minor changes of the resistor values with the help of shunts.Reversing the two rectifiers: In AT power supplies on the output side are placed two rectifier pairs of diodes. The bigger one is for +5 V and the smaller one is for +12 Volt. You can reverse both so that the bigger one can cope with the 20 ore more amps.Another solution for ATX-PSUs: A different voltage divider serves as well and needs less current.1. Between “red (5 volts)” and “black (ground)” I placed two 100 Ohm resistors in a parallel configuration.2. Between “red (5 volts)” and “yellow (12 volts)” I placed one 2k2 and one 100 Ohm resistor in a parallel configuration.The result was an output voltage of about 14.2 volts. See next picture. More details and pictures here.Reducing the fan speed: Normally you don´t need the full speed of the fan. Therefore you can reduce the fan speed. I run the fan with 5 volts you get from the -5 volts power supply. A drop of of motor oil on the fan bearing reduces also the fan noise.Cleaning the power supply: Used power pc power supplies are full of ugly dust and dirt. Take apart the power supply and wash it in a dishwasher before you modify it. After this treatment the power supply looks like a new one. I am not kidding. It works.

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Memodifikasi papan PCB: Langkah berikutnya adalah untuk mengisolasi merah 5 volt pad dengan memotong jejak PCP antara toroida inti dan pad 5 Volt. Oleh karena itu Anda dapat menerapkan obeng tajam untuk menggaruk pergi permukaan tembaga. Namun tidak pernah memotong jejak PCB tipis antara 5 volt pad dan masukan dari regulator tegangan 5 volt.

Cara memasukkan dua resistor untuk pembagi tegangan pada papan PCB:

AT power supply: Solder 18 ohm / 3 Watt antara kuning (12 volt) dan merah (terputus 5 volt) pad. Solder 7,8 ohm / 3 Watt antara merah (terputus 5 volt) dan hitam (ground) pad.

ATX power supply: Solder 36 ohm / 2 Watt antara kuning (12 volt) dan merah (terputus 5 volt) pad. Solder 18 ohm / 2 Watt antara merah (terputus 5 volt) dan hitam (ground) pad.

Tentu saja Anda dapat mengatur tegangan output dengan perubahan kecil dari nilai-nilai resistor dengan bantuan pirau.

Membalikkan dua rectifier: Dalam AT pasokan listrik pada sisi output ditempatkan dua pasang penyearah dioda. Yang lebih besar adalah untuk 5 V dan satu yang lebih kecil untuk 12 Volt. Anda dapat membalikkan kedua sehingga satu lebih besar dapat mengatasi 20 bijih lebih amp.

Solusi lain untuk ATX-PSU: A pembagi tegangan yang berbeda berfungsi sebagai baik dan kebutuhan kurang saat ini.

1. Antara "merah (5 volt)" dan "hitam (ground)" Saya menempatkan dua 100 resistor Ohm dalam konfigurasi paralel.
2. Antara "merah (5 volt)" dan "kuning (12 volt)" Aku ditempatkan satu 2k2 dan satu 100 resistor Ohm dalam konfigurasi paralel.

Hasilnya adalah tegangan output dari sekitar 14,2 volt. Lihat foto selanjutnya. Rincian lebih lanjut dan gambar di sini.

Mengurangi kecepatan kipas: Biasanya Anda jangan perlu kecepatan penuh kipas angin. Oleh karena itu Anda dapat mengurangi kecepatan kipas. Saya menjalankan kipas dengan 5 volt Anda dapatkan dari -5 volt power supply. Setetes minyak motor di bantalan kipas mengurangi juga kebisingan kipas.

Membersihkan power supply: Digunakan daya pc pasokan listrik penuh debu jelek dan kotoran. Membongkar power supply dan mencucinya dalam mesin cuci piring sebelum Anda memodifikasinya. Setelah pengobatan ini listrik terlihat seperti baru. Aku tidak bercanda. Berhasil.

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