It's at position C109...C110...on the extended version schematic...and I assume the package hasen't arrived yet...ARRR...it's taking too long...but I guess I'm too impatient...
Hi Jan,
Did sajti made his own pcb? Or did he got it from you?
Always nice to hear that other guys have success in building it. I guess it's time to give it another try!
JojoD
Did sajti made his own pcb? Or did he got it from you?
Always nice to hear that other guys have success in building it. I guess it's time to give it another try!
JojoD
li_gangyi,
Sorry but I can't seem to find sajti's post that he did his own pcb. Anyway, I'm still caught up in finishing another amp, but as soon as I do, I'll try the Lynx again.
JojoD
Sorry but I can't seem to find sajti's post that he did his own pcb. Anyway, I'm still caught up in finishing another amp, but as soon as I do, I'll try the Lynx again.
JojoD
Just for your information:
Nobody on diyaudio has got PCB's from me yet, as the PCB's (v.2.1) are being made at the moment
Nobody on diyaudio has got PCB's from me yet, as the PCB's (v.2.1) are being made at the moment
I made my own PCB, which contained the drivers, the output stage, and the PSU capacitors too
Sajti
Sajti
Jan, have you non-polarized caps there? Why? You only need those if you have pure AC or uncertain DC polarity. I think you have _very_ certain DC-level at all times.li_gangyi said:
It's just a precaution due to the charge/discharge time over the two resistors in the current limiter circuit. However the reverse voltage never gets higher than 1.2V 😉
Indeed, but why choose bipolar caps? Do you get reverse voltage at all (I talk about the emitter resistors only)? Don't think so.ACD said:
The voltage across the emitter resistors will always be "right" with reference to the cap polarity, however the cap is charges/discharges by 100R resistors R124/126 and R125/127.
A rapid change in output signal could cause a small reversed voltage over the caps, as they have to discharge through the 100R resistors.
Many uses normal caps in this circuit, however if you look at the proff studio amplifiers, many chooses to use NP-caps for secure and long living. Remember this amp is intended to be driven to it's limits over longer periods😉
A rapid change in output signal could cause a small reversed voltage over the caps, as they have to discharge through the 100R resistors.
Many uses normal caps in this circuit, however if you look at the proff studio amplifiers, many chooses to use NP-caps for secure and long living. Remember this amp is intended to be driven to it's limits over longer periods😉
Interesting, can you explain? Did any observations, measurements etc? What are we talking about in numbers?ACD said:
As I stated earlier, the maximum reversed voltage can be 1.6V.
I haven't yet made concrete measurements, but better safe that sorry 😉 1.6V reversed are not much, however in an amp rated for 24 hours/7 days a week heavy duty, I think this absolutely prolongs the life time of the caps if they are NP-caps
By the way
Complete 2 channel PCB layout with Silk Screen, Bottom, Paste and Resist layers has been uploaded on my website
I haven't yet made concrete measurements, but better safe that sorry 😉 1.6V reversed are not much, however in an amp rated for 24 hours/7 days a week heavy duty, I think this absolutely prolongs the life time of the caps if they are NP-caps
By the way
Complete 2 channel PCB layout with Silk Screen, Bottom, Paste and Resist layers has been uploaded on my website
You get reverse voltage in total due to currents flowing in the shunts but no current is flowing actually backwards => no reverse voltage at the cap.ACD said:
Note also that the two diodes are probably unnecessary beacuse the base-emitter junction act like a diode and can take rather much current. One diode in the transistor in parallel with diodes => the single diode wins.
Nice CAD job Jan but I wonder one thing: Why don't you place the part names so you can see them when all parts are soldered in? Much easier when you want to troubleshoot or just test.
Peranders
I will have to come back to this, because all the calcs I do at the moments shows that you are right 😉 . However I will have to look at my old notes and the circuit design manuals again, and then return to you
I will have to come back to this, because all the calcs I do at the moments shows that you are right 😉 . However I will have to look at my old notes and the circuit design manuals again, and then return to you
And yesh...thanks for the NP caps JAN...I will try out some standand 22uFs...serie connected 44uFs and the NP caps and do a few measurements and test runs...should tell you guys the result and sounding...to me...
li_gangyi
Your welcome... 😉
But I do not think you will be able to notice or measure any difference at all....🙂
Your welcome... 😉
But I do not think you will be able to notice or measure any difference at all....🙂
Perhaps then we can try out "burning" and stressing the amps seperately to see which ones fail first~!...lolx...I'm currently waiting for the PCBs...got all the parts laid out on my table...waiting sux...I use MJL3281As and MJL1302As though...as outputs...other parts are the same...'cept for the NP cap...lolx
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