New Leco modules 650W/8R-1200W/4R

[DjLeco]

Some improvements compared to the previous version:

6 output devices per rail.

Triple deep darlington configuration, full simmetrical from in to out.

Offset adjustment.

Faster transistors on differential and VAS stages, with lower Cob capacitance.

Double feedback pre-post L-R out filter.

Improved output shortcircuit protection with faster transistors and lower Vce saturation.

Improved randament regarding passing from AB class to B class above 60 celsius degrees, with dinamic bias.

Some specifications:

Supply from +/- 70 to +/- 115Vdc, output power 650 watts 8 ohms and 1200 watts 4 ohm at +/- 115Vdc.

Damping factor >1000/8ohms/100Hz.

Rise rime/fall time 2,5uSec, tipically 2,18uSec measured at 10Khz/8 ohms.

Freq response 15Hz-20Khz -1db at extremes, 5Hz-30Khz -3 db at extremes internally limited.

Some pictures:









Some movies and tests:

Presentation:

https://www.youtube.com/watch?v=STP1g9luils

Classical bias class AB:

https://www.youtube.com/watch?v=eyx1gNlNC0Y

dinamyc bias passing from AB class to B class when temperature rises:

https://www.youtube.com/watch?v=CysVsbNnvGM

Rise and fall times:

https://www.youtube.com/watch?v=40tmueYkMqo

Max out 8 ohm:

https://www.youtube.com/watch?v=tJkwmLvt5UI

Max out 4 ohm:

https://www.youtube.com/watch?v=Lcl-gFMOFkw

Maximum RMS current preset for 4 ohms during 2 ohms load:

https://www.youtube.com/watch?v=KfW4R9Pr5v0

Some sparks for new year:

https://www.youtube.com/watch?v=9m1sVXeFgck


Happy new year!