Hi All
I have about 75 or so pcs left of Hitachi 2SC2547E transistors... please see swapmeet post for details/PM if you'd like some.
Cheers
Rob
I have about 75 or so pcs left of Hitachi 2SC2547E transistors... please see swapmeet post for details/PM if you'd like some.
Cheers
Rob
I'm not convinced the 2SC2547 would be better than the BC550C. The feedback shunt resistor is more than 2x larger than the Rbb of the BC550C. The benefit of a low-Rbb transistor will be almost nothing.
However a transistor with high Early voltage would probably reduce output distortion (assuming that matters).
However a transistor with high Early voltage would probably reduce output distortion (assuming that matters).
C16 could have too much leakage current for this circuit based on the datasheets. It could draw 1-2mA of current. This capacitor has a safe minimum leakage specified:
UKL1C102KHD Nichicon | Mouser
People have obviously been getting by with whatever, so maybe the datasheets are highly conservative. 2mA leakage current at 20C is far too much though.
UKL1C102KHD Nichicon | Mouser
People have obviously been getting by with whatever, so maybe the datasheets are highly conservative. 2mA leakage current at 20C is far too much though.
Here is a new one with KSC1845FTA & the low leakage 1kuf cap.
Again, input and output caps, 1uf, are personal choice. I did not list any. I'll probably use Jantzen Silvers, which are enormous compared to the via holes, but whatever.
Again, input and output caps, 1uf, are personal choice. I did not list any. I'll probably use Jantzen Silvers, which are enormous compared to the via holes, but whatever.
Does anybody know if a new batch of boards are available? I'm looking for a stereo pair or single if that is what it needs.
Hi,
I just noticed my inbox was overflowing - sorry for that!
@Freecrowder: sorry, no news yet regarding the new boards! They've been shipped and should arrive any day now!
I just noticed my inbox was overflowing - sorry for that!
@Freecrowder: sorry, no news yet regarding the new boards! They've been shipped and should arrive any day now!
Hi everyone!
Boards arrived and are ready for distribution 😛
In case you want a board, please send me a message!
Price is again the same:
Boards arrived and are ready for distribution 😛
In case you want a board, please send me a message!
Price is again the same:
Last edited:
Hi everyone,
recent orderes have been mailed today!
Happy building!
Looking forward to see some cool prototypes here!
recent orderes have been mailed today!
Happy building!
Looking forward to see some cool prototypes here!
Brad: Not batteries, but as and when* I get around to building mine I will be using one of Jan's silentswitchers to power it.
*On current run rate before 2020 but maybe not much before 🙂
*On current run rate before 2020 but maybe not much before 🙂
billshurv,
I did a search for the silentswitcher and not sure how that will work with the High Octane? From what I found it only puts out a max of +/-24VDC. Can you point me in the right direction for what you're planing on using.
Hannes,
Based on my limited ability to understand the High Octane power supply it appears that it provides the required stable power. What is needed for the 50-48VDC? Just a rectifier of the power transformer or should additional filtering with caps be applied?
Thanks,
Brad
I did a search for the silentswitcher and not sure how that will work with the High Octane? From what I found it only puts out a max of +/-24VDC. Can you point me in the right direction for what you're planing on using.
Hannes,
Based on my limited ability to understand the High Octane power supply it appears that it provides the required stable power. What is needed for the 50-48VDC? Just a rectifier of the power transformer or should additional filtering with caps be applied?
Thanks,
Brad
You can use it single ended, so in stock form instead of +/-15 you get 0,+30. If you get one of the of newer ones that are adjustable you can do 40V.
Billshurv,
Are you planning to bypass the High Octane power supply, because 40VDC is what the audio circuit needs. If you use the on board power supply there is not enough overhead from the silentswitcher.
Are you planning to bypass the High Octane power supply, because 40VDC is what the audio circuit needs. If you use the on board power supply there is not enough overhead from the silentswitcher.
I recommend a DC supply with a bit of filtering. I would not use a raw AC supply as the diodes rectifying the voltage generate quite some noise in the supply lines, so at least some filtering would be nice (so the noise stays close to the diodes-1st cap).
The onboard PSU is a very powerful shunt regulator and takes care of any ripple from the externally supplied voltage.
For those tinkering with the idea to build this little bugger - a few boards are still available!