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Old 16th October 2010, 09:19 AM   #1
djuke is offline djuke  Netherlands
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Default Mosfet power amplifier 2SJ162/2SK1058

Many mosfet power amplifiers based on 2SJ162/2SK1058 lateral mosfets are made. This one is particularly suitable for home-use, being small, having moderate power with very low distortion:
  • Max output power: 100W@8ohm, 150W@4ohm
  • THD+N (1kHz): < 0.005% (measured!)
  • PCB dimensions: 100x60mm
  • Input sensitivity: 1.2V rms
  • Input impedance: 22kohm
  • Bandwidth: 80kHz
  • Voltage gain: 27dB
Available as complete kit or pcb-only, so you can select components yourself. Mosfets/components are also available separately.

More info:
Mosfet Power Amplifier
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File Type: jpg Mosfetamp_assembled.JPG (345.3 KB, 1673 views)
File Type: jpg Mosfetamp_side.JPG (191.4 KB, 1531 views)
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Old 5th November 2010, 09:49 AM   #2
djuke is offline djuke  Netherlands
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There appeared to be a ground loop in the measurement setup, so I removed it and repeated the measurements. THD and noise characteristics were even better, with measured A-weighted THD+N @ 1kHz using 8 ohm load 0.0021%!
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Old 3rd January 2011, 12:09 PM   #3
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Default Mosfet Amplifier

Hi, I am interested in buying kits for this amplifier. Please let me know if they are available and what the price is. I will be using it with a 100V line output transformer and a six channel mixer for our church.

Regards
Herman
hermanb3@absamail.co.za

Quote:
Originally Posted by djuke View Post
Many mosfet power amplifiers based on 2SJ162/2SK1058 lateral mosfets are made. This one is particularly suitable for home-use, being small, having moderate power with very low distortion:
  • Max output power: 100W@8ohm, 150W@4ohm
  • THD+N (1kHz): < 0.005% (measured!)
  • PCB dimensions: 100x60mm
  • Input sensitivity: 1.2V rms
  • Input impedance: 22kohm
  • Bandwidth: 80kHz
  • Voltage gain: 27dB
Available as complete kit or pcb-only, so you can select components yourself. Mosfets/components are also available separately.

More info:
Mosfet Power Amplifier
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Old 4th January 2011, 02:21 PM   #4
djuke is offline djuke  Netherlands
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Hi Herman, kits are in stock: 50 euro for a single kit (pcb+components), decreases to 40 euro/kit if you buy 5 or more.

Menno
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Old 8th July 2011, 02:09 PM   #5
lineup is offline lineup  Sweden
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Nice MOSFET Kit

Click the image to open in full size.
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Old 11th July 2011, 06:21 AM   #6
djuke is offline djuke  Netherlands
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Thank you lineup, pcb's and kits are still in stock!
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Old 11th July 2011, 12:09 PM   #7
akira is offline akira  France
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Hi djuke,

What is the recommended rail voltage ? And the transformer VA ?

Thanks
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Old 11th July 2011, 12:28 PM   #8
djuke is offline djuke  Netherlands
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Quote:
Originally Posted by akira View Post
What is the recommended rail voltage ? And the transformer VA ?
Assuming one channel, 100W @ 8 ohm, you need about 48V rail voltage, which is also perfect for the output relay. Minimum transformer VA of 125VA would then be required.

150VA are commonly available, and 35-0-35 transformer will give you 48V rail, which is about ideal.

More info, including transformer computations for other cases: Mosfet Power Amplifier
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Old 17th August 2011, 02:52 PM   #9
radio is offline radio  Macedonia
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Quote:
Originally Posted by djuke View Post
Assuming one channel, 100W @ 8 ohm, you need about 48V rail voltage, which is also perfect for the output relay. Minimum transformer VA of 125VA would then be required.

150VA are commonly available, and 35-0-35 transformer will give you 48V rail, which is about ideal.

More info, including transformer computations for other cases: Mosfet Power Amplifier
Hi djuke!
Where is the PCB and part list?
Otherwise the amplifier is very good!
thenks and cheers !
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Old 18th August 2011, 09:59 AM   #10
djuke is offline djuke  Netherlands
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PCB's can be bought in my webshop. When you buy a pcb or kit, you will receive the part list with all suggested values with it.
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