Do It Yourself
DC Power Supply
28V to 50V 15A DC Power Supply
The 50MHz magic band will be on peak propagation at the last and this years. I am now currently use the homemade dipole and FT-736 + homemade 100W linear amplifier for the DX. Because of my dipole antenna is no gain, I feel that I always can listen the DX stations but cannot call back them at the same time. In this cause, I think I need to build a new higher power linear amplifier. In this project, the 50V 15A DC power supply. I want to use it to drive my 50MHz 300W amp. And also the Phase 3D satellite is ready now. So I also need to increase my 430MHz TX power from 25W to 100W. That 430MHz linear amplifier use 28V DC operate. For the 50V 15A power supply, I am now make it from at least 28V to 50V. Please see the following information.
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| After assembly |
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| Regulator unit | Rectifier unit |
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| Regulator + Rectifier | Transformer |
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| Front panel | Power transistor |
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| Power up delay unit | Grounding |
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Schematic Diagram in PDF
format
PCB Layout in PDF format
Assembly Drawing
The accident happened
during the test
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Specifications and Details :
| a)
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Input
Voltage
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:
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220V
AC
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| b)
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Output
Voltage
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:
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28V
to 50V DC
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| c)
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Max.
Output Current
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:
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15A
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| d)
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Output
Voltage Adjust
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:
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With
a variable resistor from 3V to 50V any voltage adjust.
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| e)
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Output
Terminal
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:
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With
two pairs Red and Black output terminals.
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| f)
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Circuit
Protection
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:
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With
4 pcs of fuse at primary part and current limiter at 15A maximum output.
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| g)
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Filtering
Device
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:
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35V
4700uF x 20pcs Electrode Capacitor.
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| h)
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Regulated
Device
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:
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4 pcs of 120V 30A 250W darlington power transistors, 4 pcs of middle power transistors, 2 pcs of small signal transistors and 2 pcs of zener diodes.¡@ |
| i)
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Transformer
Device
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:
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With
2 pcs of 21V-0-21V 300VA power transformer.
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| j)
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Display
Unit
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:
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With
large size voltage, current meter and back lights.
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