I was checking the layout and I found an error sorry, R21 is 100R I can fix it is just silkscreen 🙂 ok here we go I apologize for the inconvenience
Regards
Juan
Regards
Juan
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You could also do with a re-annotation run.
I like my component numbering to go from left to right and down the pcb so they are easy to find.
on the numbering of the PCB I only identified the parts using this schematic if example we are going to locate example R49 from the schematic I can then easily see where is it 🙂 of course this is diy I do for my own service sort like a manual making sure all is connections are the way it suppose to be, it wasn't easy 😛 I think I spend a couple of day doing that also identified the transistor leads 🙂
I was also making a simulation and the circuit does respond really well I only found one thing I'm not sure if that is safe if I make this change but the THD was too high I think and I replace R21 and R22 to 65 ohms and the THD went down a lot here is the image of the simulation with 133 mVp sine to a 8 ohms load the THD is about 0.002% output 2.517W for easy listening soft music 🙂 I mean this are my finds I'm not an expert but I'm learning 😉
one question is it safe to change R21 and R22 to 65 ohms ? if not then I will just fallow the schematic as it is 🙂
Regards
Juan
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Apex's sch breaks the most usual "code" for labeling components on a sch.
But there are many "codes" and some don't adopt any logical pattern.
Nigel's code
And when transfered to the PCB layout, it all falls apart because component placement has nothing to do with the label attached to it.
But there are many "codes" and some don't adopt any logical pattern.
Nigel's code
is the most common. But it is not universal.
And when transfered to the PCB layout, it all falls apart because component placement has nothing to do with the label attached to it.
"can i replace output transitor with mosfet K134/J49 (circuit APEX HV23)?"
It would require a redesign for the different pin-outs, plus a different bias circuit.
It would require a redesign for the different pin-outs, plus a different bias circuit.
I think he has mention that only goes with IRFP250 and IRFP9240 on the Apex HV23 I wouldn't change them and I have really good results on the simulation besides they are cheaper than BJT about $2.19 for IRFP240PBF-ND and $2.67 for IRFP9240PBF-ND at the moment of this writing, 🙂 also one more note to add I think if I'm not wrong, I can change only the 2SC2240 for KSC1845 also the complement KSA992 because the 2SC2240 are hard to find and I really don't trust EBay that much 😛 lol and at least the 2SA1013 and 2SC2383 they are plenty of those 🙂
Regards
Juan
Regards
Juan
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Here is a good little circuit.
Based on a Hitachi lateral mosfet datasheet but converted to IRFP240/9240 vertical mosfets. Good for 300WRMS.
Based on a Hitachi lateral mosfet datasheet but converted to IRFP240/9240 vertical mosfets. Good for 300WRMS.
An externally hosted image should be here but it was not working when we last tested it.
just in case, I made an error 😕 the 100K is 100R not 100K my bad xD
Regards
Juan
Regards
Juan
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There is mistake... use this pcb with corect circuit.
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oh thank you now I can update the one I'm making I appreciate mister Mile 🙂
Regards
Juan
Hello,
a question for apexaudio.
I can use a switch like this Commutatore ceramico 2 VIE 2 POSIZIONI militare | eBay to have two entries in the amplifier? the GND of the inputs connected to go?
Thank You
a question for apexaudio.
I can use a switch like this Commutatore ceramico 2 VIE 2 POSIZIONI militare | eBay to have two entries in the amplifier? the GND of the inputs connected to go?
Thank You
Schematic for NE555 protect, I think its on Apex BA1200 thread.
Regards,
Sonal Kunal
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