Sure there has to be single active component in an
amp in order to get the gain to be called an AMPLIFIER. That's a simple amplifier as a single end tube amplifier. A single end vacuum tube Amp need a resistor or two and an output transformer. So I design a FET amp
around the same simplicity of design. One audio grade MOSFET, a couple of
resistors and capacitors and a heavy duty well filtered power supply. The
schematic for the amplifier section is shown in Figure 1.
The amplifier is built around the Hitachi 2SK1058 N-Channel MOSFET. A schematic and pin
diagram for the 2SK1058 is shown in Figure 2. I used Sprague capacitors for the
input coupling and a large electrolytic on the output with a 10µF polyester
bypass capacitor. The four 10W non-inductive wire wound resistors act as the
load. The four resistors are 15ohm and 10W each which I wired two in series for
30 ohms and then the two sets of 30 ohms are wired in parallel to give a total
resistance of 15 ohms. These get extremely hot and burn about 30W at idle. Yes,
Class-A amplification is very inefficient. I burn over 20 Watts to get only
about 4.8 audio Watts per channel! The heatsink I used is rated at 0.784 °C/W.
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| 2SK1058 Pin Out |
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| Schematic 2SK1058 Amplifier | | |
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| Power Supply of 2SK1058 Amplifier |
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| Stereo 2SK1058 Amplifier Module |
1 comment:
Hi sir the BCB design send my id gopalsankar8@mail.com
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