Cooling needed?
I have built one SR200 and have it running on +/- 70V.
I can set bias for it to be at 100mA (10Ohm resistors do not go up in flames).
However, the MJE 340/350 all get very hot. During short up-times I did some measuring and it seems that each of these MJE's has approx 67V between E-C and runs some 10mA. Should these T's get warm with these numbers? Should I heatsink them (I see heatsinks on them in some builds.
Or does this mean that there is an error in my build?
I have built one SR200 and have it running on +/- 70V.
I can set bias for it to be at 100mA (10Ohm resistors do not go up in flames).
However, the MJE 340/350 all get very hot. During short up-times I did some measuring and it seems that each of these MJE's has approx 67V between E-C and runs some 10mA. Should these T's get warm with these numbers? Should I heatsink them (I see heatsinks on them in some builds.
Or does this mean that there is an error in my build?
Attachments
sir apex i want to make a pcb for your buffer but it seems that 2n5462 symbol is not meant for transistor and also symbol for fet i dont know which one is source and which one is drain.symbol for fet is not clear.please can you give us the correct schematic.thank you..🙂
sir mile
can you please show to us how to implement triple darlington topology...so we can try to feed the amp with +/-110v for 750w max output...
thanks
regards
ees...
it would be best if you fitted heat sink tab's for the mje340/50's to aid there cooling...
apex regulator
apex i make car smps and connect to your regulator.i want to use+-65v,what suitable voltage should i produce from smps and than regulate using your regulator?or have calculation.because i confuse which better input 90v regulate to 65v or input 75v regulate to 65v.
apex i make car smps and connect to your regulator.i want to use+-65v,what suitable voltage should i produce from smps and than regulate using your regulator?or have calculation.because i confuse which better input 90v regulate to 65v or input 75v regulate to 65v.
Cooling needed?
Anyone else done this too?
I run SR200 on +/- 70V and found that 5 transistors get pretty hot. It all works just fine, however, I made some cooling on the MJE transistors and the 2 BC550's that connect to the + via the 100ohm resistors (see picture).
Isn't it strange that the 2 BC550's on the '-' side do not get as hot as the ones on the + side?
Anyone else done this too?
I run SR200 on +/- 70V and found that 5 transistors get pretty hot. It all works just fine, however, I made some cooling on the MJE transistors and the 2 BC550's that connect to the + via the 100ohm resistors (see picture).
Isn't it strange that the 2 BC550's on the '-' side do not get as hot as the ones on the + side?
Attachments
Hi Apex, did you ever make a pcb for the regulator in post 14 with 4 output transistors?
It's strange that the 2 BC550 get hot. MJEs must be hot and BCs must be cold in cascode VAS...
why is resistor r9 and r10 is before the r11.how can you get the ideal 4ma when your voltage is only 15volts?
anyone?can you please help me on r9 and r10.is it before r11 or after?check me if im wrong r9, r10,d2, and c5 are used to regulate the supply of ic1. im making new foil pattern for this one. thank you for your time.