BD241C/242C don't need heatsink, and can be replaced with TIP31C/32C if it's not available in your area.
Regards
Triac MAC224 shorted amp output and GND to protect speakers if DC voltage on amp out is over 30V.
Yes, that is better than use separate heatsinks for drivers and use wire for BIAS transistor.
My favorite
I listen SR50 last month without C10, C11 (100pF), and everyone who heard this amp like it at first sound.Regards
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Good design , apex. Mind if I make a voltage board out of it ??
hawksford cascode meets hitachi topology ....
A few comments/questions.
1 . why 47k for r22/23? , mje340/350 are low hfe , might need more current for stable cascode reference. also , why do you reference cascode to ground.
2.why no CCS for input pair , this might make for better sonics at the expense of PSRR.
3.very small Vbe decoupling.. - .22uF ???
4. C10/11 ... are there OPS stability issues ?? I have only needed this on my prototype triple EF's.
Still , nice in general... might need a 100 x 100mm voltage board layout to do it.(lots of trannies) But I will , as well as simulate the heck out of it.
OS
Hi OS,Good design , apex. Mind if I make a voltage board out of it ??
hawksford cascode meets hitachi topology ....
A few comments/questions.
1 . why 47k for r22/23? , mje340/350 are low hfe , might need more current for stable cascode reference. also , why do you reference cascode to ground.
2.why no CCS for input pair , this might make for better sonics at the expense of PSRR.
3.very small Vbe decoupling.. - .22uF ???
4. C10/11 ... are there OPS stability issues ?? I have only needed this on my prototype triple EF's.
Still , nice in general... might need a 100 x 100mm voltage board layout to do it.(lots of trannies) But I will , as well as simulate the heck out of it.
OS
1. I always use 1N4148 with 1-1,5mA reff to gnd for CCS or cascode and it's stable with half of this current.
2. I considering to use CCS with FET instead 15k resistor.
3. I usualy don't use Vbe decoupling or very small value 22nF.
4. I don't use C10/11 for my home amp, it's add only for DIY version.
Regards
ok I make it non polar ecap
hi coolet...
i notice you make really nice pcb designs...
would you mind telling us what software you use???...
tnx...
ees
