Hello everybody.
This discussion is to replace - discrete, solid state, medium power and transistor based power amp module. I already have +/-33V, 200VA PS with output protection relay and chassis in place. Dimension of PCB < 80mm * 80mm
Since many years I was using power amplifier designed with HEXFET. It was running with 100mA quotient current and used for moderate power levels ~20W/ch. This was sounding very nice but somehow I could not avoid problem of thermal runaway. International Rectifier (Manufacturer of HEXFET) does not recommend using these devices for audio power output device. Same thing mentioned at DIYAudio discussions and Rod-Elliot website. MOSFET/HEXFET have positive thermal coefficient against normal negative thermal coefficient of BJT/semiconductors in general.
ref - International Rectifier - HEXFET Power MOSFET Product Information
ref - Using HEXFETs in High Fidelity Audio
Eventually right channel of my power amp died couple of days back and I am now using standby t-amp with limited power of 10W/ch. I can add temp compensation to existing kit but now thinking to go away from HEXFET. That why looking at low quotient current (30-50mA) and no cross over distortion.
After looking into many designs, I came across this Destroyer x Amplifier...Dx amp...my amplifier - diyAudio - designed by forum member Carlos and few suggestions on forum.
Schematic and original work here -
Greg's Web Site
One ebay clone (search DX-AMP in consumer electronics section) TOSHIBA A1943/C5200 DX-AMP Power amplifier Kit 2-CH | eBay
My plan is to buy ready-made kit or ebay clone and upgrade components if not satisfied.
If anybody has experience or thought with this particular kit then please narrate here.
Thanking in advance,
This discussion is to replace - discrete, solid state, medium power and transistor based power amp module. I already have +/-33V, 200VA PS with output protection relay and chassis in place. Dimension of PCB < 80mm * 80mm
Since many years I was using power amplifier designed with HEXFET. It was running with 100mA quotient current and used for moderate power levels ~20W/ch. This was sounding very nice but somehow I could not avoid problem of thermal runaway. International Rectifier (Manufacturer of HEXFET) does not recommend using these devices for audio power output device. Same thing mentioned at DIYAudio discussions and Rod-Elliot website. MOSFET/HEXFET have positive thermal coefficient against normal negative thermal coefficient of BJT/semiconductors in general.
ref - International Rectifier - HEXFET Power MOSFET Product Information
ref - Using HEXFETs in High Fidelity Audio
Eventually right channel of my power amp died couple of days back and I am now using standby t-amp with limited power of 10W/ch. I can add temp compensation to existing kit but now thinking to go away from HEXFET. That why looking at low quotient current (30-50mA) and no cross over distortion.
After looking into many designs, I came across this Destroyer x Amplifier...Dx amp...my amplifier - diyAudio - designed by forum member Carlos and few suggestions on forum.
Schematic and original work here -
Greg's Web Site
One ebay clone (search DX-AMP in consumer electronics section) TOSHIBA A1943/C5200 DX-AMP Power amplifier Kit 2-CH | eBay
My plan is to buy ready-made kit or ebay clone and upgrade components if not satisfied.
If anybody has experience or thought with this particular kit then please narrate here.
Thanking in advance,