Hey!
Here's my latest build. 2SJ162 / 2SK1058 mosfet power amplifier.
I built one like this 20 years ago, but now I decided to build it again and little powerful.
I used four pairs fet's in parallel and the voltage is +/- 60V
I found new old stock, original hitachi J162 / K1058 fet's, and they are same production batch
And second amp board.
And casing
In the background is a protective circuit and a soft starter.
The front panel has a 12v power switch. Next to the back panel is a 12v relay that switches the main voltages to transformers.
Transformer is 2x 42V 1000va which makes + - 60 volts rectified, and 40000uf/ rail.
The quiescent current is 800mA / channel
Sound nice.
Sorry my bad english. I use google translator
Here's my latest build. 2SJ162 / 2SK1058 mosfet power amplifier.
I built one like this 20 years ago, but now I decided to build it again and little powerful.
I used four pairs fet's in parallel and the voltage is +/- 60V
I found new old stock, original hitachi J162 / K1058 fet's, and they are same production batch
And second amp board.
And casing
In the background is a protective circuit and a soft starter.
The front panel has a 12v power switch. Next to the back panel is a 12v relay that switches the main voltages to transformers.
Transformer is 2x 42V 1000va which makes + - 60 volts rectified, and 40000uf/ rail.
The quiescent current is 800mA / channel
Sound nice.
Sorry my bad english. I use google translator
Last edited:
Nice build!
Power Output? (i guess something between 125-150W RMS/8Ω with 60v rails)
42V AC is under 60VDC, aprox.56v
Last edited by a moderator:
2SC5200 / 2SA1943 build from Chinese kits
After many a hurdle, I have finally finished (99%) my first major amp project.
Using parts from Taobao, with a total cost probably around $150, I don't think it turned out bad, but, hope to get some feedback for future projects so if anyone has any pointers on where I went wrong, feel free...
Cant see it in any of the photos, but a 120mm PC fan is screwed to the lid.
I was recommended to drill a few holes in the bottom for airflow, so I chopped a 120mm square out and screwed in a cheap PC fan grill. Botched the IR receiver to the bottom as I disnt want to make any holes in the front panel.
The actual PCB. I eneded up buying 5(!), breaking 3 in various ways along the journey
After many a hurdle, I have finally finished (99%) my first major amp project.
Using parts from Taobao, with a total cost probably around $150, I don't think it turned out bad, but, hope to get some feedback for future projects so if anyone has any pointers on where I went wrong, feel free...
Cant see it in any of the photos, but a 120mm PC fan is screwed to the lid.
I was recommended to drill a few holes in the bottom for airflow, so I chopped a 120mm square out and screwed in a cheap PC fan grill. Botched the IR receiver to the bottom as I disnt want to make any holes in the front panel.
The actual PCB. I eneded up buying 5(!), breaking 3 in various ways along the journey
Last edited:
The spec output is 150watt.
the fan and additional HS weren't part of the original master plan, I (foolishly) thought that my case choice was way overkill for those 8 little chips, but I quickly found out that was not the case when I burned one out on the first power up (not seated to the heatsink fully)
Following advice from this glorious board I reduced the power of the amp by about 7/8ths, which reduced the amount of heat, but it was still too much for me to explain to the wife, so I put the fan in. This was probably enough to be honest but a friend suggested that the fan wasn't very efficient as the heat sinks are on the outside and the fan is on the inside, so I set about trying to squeeze some on the inside too.
I'd do the whole build very differently if I were to do it again, but I enjoyed this learning process and it gave me a good excuse to buy more tools
Help keep your forum clean and clutter free. Do not quote the entire post just above yours. See the RULES section. Clutter removed.