As far as I know the bc5xx series of PNP & NPN transistors are all the same.
They are selected to pull out the low noise, 549 550 and 559 and 560.
They are selected to pull out the high voltage versions, 546 and 556.
They are selected to pull out the higher gain, b & c.
This is all speculation based on the datasheet info.
High voltage and high gain are not readily available. 546b, 556b and 550c, 560c are easily available.
They are selected to pull out the low noise, 549 550 and 559 and 560.
They are selected to pull out the high voltage versions, 546 and 556.
They are selected to pull out the higher gain, b & c.
This is all speculation based on the datasheet info.
High voltage and high gain are not readily available. 546b, 556b and 550c, 560c are easily available.
I would at least use proper complimentary pairs. The compliment of BC549 is the BC559, and the compliment of BC556 is BC546.
As was mentioned already, these are all incredibly inexpensive parts. It's probably worth it to just get the low noise versions we spec'd. Mouser has the Fairchild version for $0.06 each.
As was mentioned already, these are all incredibly inexpensive parts. It's probably worth it to just get the low noise versions we spec'd. Mouser has the Fairchild version for $0.06 each.
Hallo MrMajestic,
Can You describe the sound print of Diamante and what headphone you use?
Have You measured the performaces?
What kind of power supply You use?
Thank You a lot.
Semola
Can You describe the sound print of Diamante and what headphone you use?
Have You measured the performaces?
What kind of power supply You use?
Thank You a lot.
Semola
semola said:
The Diamante is very neutral sounding. It doesn't add any color to the music, at least that's what I think. It will be interesting to hear what the other builders have to say about it.
I don't have any means of measuring anything I'm afraid. Maybe others have the possibility to do that.
I use Twisted Pears bipolar supply for it. My balanced build will be dual mono just for the hell of it 🙂
semola said:
Hi !
Just have a look on Post #201, you'll find some answers.
I'm using a HD-650.
Build it with a little more gain than the original... and enjoy 😎
An externally hosted image should be here but it was not working when we last tested it.
the build is progressing
Nice job Adamus ! 😎
Only R26 are missing with their wired inductors (about 20 wires).
This time I'm planning to try differents values for the gain, in this view I'll use some "DIP adaptors" for the R without desoldering. (R3 and R4)
Only R26 are missing with their wired inductors (about 20 wires).
This time I'm planning to try differents values for the gain, in this view I'll use some "DIP adaptors" for the R without desoldering. (R3 and R4)
I set up little 'production line'. only took 2 hours to stuff them. Not the most interesting way of doig it, and if there is a systematic error then i am screwed.....
Ryssen said:
If you build it by the schematic then I would stay between 10V and 18V rails.
You could probably get it up to 20V but watch your temp.
I would stick with 15V rails.
AndrewT said:
Yes, as long as you keep the load and bias currents in a range to suit that voltage it will work great. In fact with those voltages if you used beefy output Qs and heat sinks you could easily make a power amp. 🙂