Mosfet power amplifier 2SJ162/2SK1058

djuke · 16th October 2010, 09:19 AM

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

djuke · 5th November 2010, 09:49 AM

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%!

HermanB3 · 3rd January 2011, 12:09 PM

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

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

djuke · 4th January 2011, 02:21 PM

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

lineup · 8th July 2011, 02:09 PM

Nice MOSFET Kit

djuke · 11th July 2011, 06:21 AM

Thank you lineup, pcb's and kits are still in stock!

akira · 11th July 2011, 12:09 PM

Hi djuke,

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

Thanks

djuke · 11th July 2011, 12:28 PM

Quote:

Originally Posted by akira

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

radio · 17th August 2011, 02:52 PM

Quote:

Originally Posted by djuke

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 !

djuke · 18th August 2011, 09:59 AM

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.

8th July 2011, 02:09 PM	#5
lineup diyAudio Member Join Date: Dec 2005 Location: the north	Nice MOSFET Kit __________________ lineup

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5th November 2010, 09:49 AM	#2
djuke diyAudio Member Join Date: Jan 2007 Location: Amersfoort	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%!

4th January 2011, 02:21 PM	#4
djuke diyAudio Member Join Date: Jan 2007 Location: Amersfoort	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

11th July 2011, 06:21 AM	#6
djuke diyAudio Member Join Date: Jan 2007 Location: Amersfoort	Thank you lineup, pcb's and kits are still in stock!

11th July 2011, 12:09 PM	#7
akira diyAudio Member Join Date: Jan 2002 Location: Paris France	Hi djuke, What is the recommended rail voltage ? And the transformer VA ? Thanks

18th August 2011, 09:59 AM	#10
djuke diyAudio Member Join Date: Jan 2007 Location: Amersfoort	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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