F6 with a diamond BJT input buffer
That there is only 1 dB difference is probably due to the resistance of the
primary winding.
Nearly there - F6 using cree SiC fets
Nearly there, Just a bit of chassis work and testing to go.
Twitchy to set the bias/offset. Wish I'd used multi turn trimpots now! currently biased up to about 1.6A, and the heatsinks are apparently at about 55C
Once I have it roughly set up I'll try an run it through a basic pc THD test.
Nearly there, Just a bit of chassis work and testing to go.
Twitchy to set the bias/offset. Wish I'd used multi turn trimpots now! currently biased up to about 1.6A, and the heatsinks are apparently at about 55C
Once I have it roughly set up I'll try an run it through a basic pc THD test.
Attachments
I just noticed after many months of use of my F6, that it has the tendency for the output to swing little bit on offset, making my full ranger to go back in terms of cone movement and then settle back. Is it normal for F6 to behave like this, or did my power supply alter it's behavior off-late. Don't know what it is because, I did not notice before.
Thanks in advance.
Thanks in advance.
What ZM said is best, but what you suggest will work, start with one channel at a time (Disconnect PSU from one channel), have a meter across a source resistor and don't be surprised if you need to turn it down quickly.
Bit it also depends on the Vgs of your specific Mosfet and the Zener voltage... I used 5.1V in the beginning and couldn't get enough bias, and then replaced them with 9.1V zener, and had tons. YMMV.
Bit it also depends on the Vgs of your specific Mosfet and the Zener voltage... I used 5.1V in the beginning and couldn't get enough bias, and then replaced them with 9.1V zener, and had tons. YMMV.
Hey!
Im going to make a factory order of my PCB!
Has also the possibility to use the Diamond Buffer in it.
Cost depends on the quantity but I am aiming to below 10$/pc.
Lets not pollute this thread, so better throw a private message if interested!
Thanks!
Where is this schematic with diamond buffer ?
Where is this schematic with diamond buffer ?
You find the original diyAudio F6 circuit from http://www.diyaudio.com/forums/pass-labs/258613-diyaudio-firstwatt-f6.html thread.
On my PCB you have the option to replace the JFET buffer with a simple diamond buffer.
I used these components in my prototype (because that was what I had on hand), but feel free to experiment...
C3 was 1uF 50V X7R MLCC in the proto...
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A preview of the diyAudio F6 build guide can be found here -- http://www.diyaudio.com/forums/pass-labs/258613-diyaudio-firstwatt-f6-10.html#post4341419
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