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power transistor for PS. what to uses?
Hi everyone I have made a power supply for my rigs
The schematic is the typical regulator with power transistor wrapped around it for the extra juice. I need 40 amps continues .. I tried 4 mj2955 which are rather nice for foot warming in the winter . I also tried nte-180 which are very good. is there anything better at a logical price I would like to keep the number of transistors down to 1 or 2. Can someone advise my on what to use for power? -- http://www.qsl.net/sv1hao |
"Deos" wrote in message ... Hi everyone I have made a power supply for my rigs The schematic is the typical regulator with power transistor wrapped around it for the extra juice. I need 40 amps continues .. I tried 4 mj2955 which are rather nice for foot warming in the winter . The function of the pass transistor is to dissipate as heat the difference between input and output. Sounds like you need a bigger heat sink...or build a switching supply. Ray |
"Deos" wrote in message ... Hi everyone I have made a power supply for my rigs The schematic is the typical regulator with power transistor wrapped around it for the extra juice. I need 40 amps continues .. I tried 4 mj2955 which are rather nice for foot warming in the winter . The function of the pass transistor is to dissipate as heat the difference between input and output. Sounds like you need a bigger heat sink...or build a switching supply. Ray |
Hi, check this link and see what you need to do,
one or two pass trans. will not do the job for you, easier to use 6-10 pass trans to share the load. http://www.mitedu.freeserve.co.uk/Ci...er/1230psu.htm Is your transformer able to supply necessary power to this supply ? regards, clarke Deos wrote: Hi everyone I have made a power supply for my rigs The schematic is the typical regulator with power transistor wrapped around it for the extra juice. I need 40 amps continues .. I tried 4 mj2955 which are rather nice for foot warming in the winter . I also tried nte-180 which are very good. is there anything better at a logical price I would like to keep the number of transistors down to 1 or 2. Can someone advise my on what to use for power? -- http://www.qsl.net/sv1hao |
Hi, check this link and see what you need to do,
one or two pass trans. will not do the job for you, easier to use 6-10 pass trans to share the load. http://www.mitedu.freeserve.co.uk/Ci...er/1230psu.htm Is your transformer able to supply necessary power to this supply ? regards, clarke Deos wrote: Hi everyone I have made a power supply for my rigs The schematic is the typical regulator with power transistor wrapped around it for the extra juice. I need 40 amps continues .. I tried 4 mj2955 which are rather nice for foot warming in the winter . I also tried nte-180 which are very good. is there anything better at a logical price I would like to keep the number of transistors down to 1 or 2. Can someone advise my on what to use for power? -- http://www.qsl.net/sv1hao |
clarke wrote:
Hi, check this link and see what you need to do, one or two pass trans. will not do the job for you, easier to use 6-10 pass trans to share the load. http://www.mitedu.freeserve.co.uk/Ci...er/1230psu.htm Is your transformer able to supply necessary power to this supply ? regards, clarke Deos wrote: Hi everyone I have made a power supply for my rigs The schematic is the typical regulator with power transistor wrapped around it for the extra juice. I need 40 amps continues .. I tried 4 mj2955 which are rather nice for foot warming in the winter . I also tried nte-180 which are very good. is there anything better at a logical price I would like to keep the number of transistors down to 1 or 2. Can someone advise my on what to use for power? -- http://www.qsl.net/sv1hao If you want to keep it to a couple transistors they would be expensive. You are better off using either more NTE-180 or more mj2955, but I would cut the voltage down to around 18 volts instead of 24 volts as this higher voltage leads to more heat for the transistors. Rob |
clarke wrote:
Hi, check this link and see what you need to do, one or two pass trans. will not do the job for you, easier to use 6-10 pass trans to share the load. http://www.mitedu.freeserve.co.uk/Ci...er/1230psu.htm Is your transformer able to supply necessary power to this supply ? regards, clarke Deos wrote: Hi everyone I have made a power supply for my rigs The schematic is the typical regulator with power transistor wrapped around it for the extra juice. I need 40 amps continues .. I tried 4 mj2955 which are rather nice for foot warming in the winter . I also tried nte-180 which are very good. is there anything better at a logical price I would like to keep the number of transistors down to 1 or 2. Can someone advise my on what to use for power? -- http://www.qsl.net/sv1hao If you want to keep it to a couple transistors they would be expensive. You are better off using either more NTE-180 or more mj2955, but I would cut the voltage down to around 18 volts instead of 24 volts as this higher voltage leads to more heat for the transistors. Rob |
Hi everyone I have made a power supply for my rigs
The schematic is the typical regulator with power transistor wrapped around it for the extra juice. I need 40 amps continues .. I tried 4 mj2955 which are rather nice for foot warming in the winter . I also tried nte-180 which are very good. is there anything better at a logical price I would like to keep the number of transistors down to 1 or 2. Can someone advise my on what to use for power? ======== Assuming that so far you have only considered bi-polar transistors ,perhaps it would be beneficial to look into the application of Power MOSFETs. In the 'on' state they have a very low resistance ,hence at high currents they dissipate less heat . Consequently you would need smaller heat sinks. Frank GM0CSZ / KN6WH |
Hi everyone I have made a power supply for my rigs
The schematic is the typical regulator with power transistor wrapped around it for the extra juice. I need 40 amps continues .. I tried 4 mj2955 which are rather nice for foot warming in the winter . I also tried nte-180 which are very good. is there anything better at a logical price I would like to keep the number of transistors down to 1 or 2. Can someone advise my on what to use for power? ======== Assuming that so far you have only considered bi-polar transistors ,perhaps it would be beneficial to look into the application of Power MOSFETs. In the 'on' state they have a very low resistance ,hence at high currents they dissipate less heat . Consequently you would need smaller heat sinks. Frank GM0CSZ / KN6WH |
On Mon, 20 Oct 2003 11:20:20 -0400, rob34 wrote:
If you want to keep it to a couple transistors they would be expensive. You are better off using either more NTE-180 or more mj2955, but I would cut the voltage down to around 18 volts instead of 24 volts as this higher voltage leads to more heat for the transistors. Rob How come no one's yet recommeded that great old PSU war-horse, the 2N3055? Six of them on a decent heat sink and you're sorted! -- "Windows [n.], A thirty-two bit extension and GUI shell to a sixteen bit patch to an eight bit operating system originally coded for a four bit microprocessor and produced by a two bit company." |
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