I’m giving away fully assembled ready to run diamond buffer boards designed by Jhofland, while supplies last (1 pair per member and you pay shipping). You can sign up in this thread here:
https://www.diyaudio.com/community/threads/jhoflands-diamond-buffer-gb.401244/
These boards are great for driving line level signals, and can even be used as a headphone amp as is, or with some tweaks to enable low impedance 32ohm cans. These Xmas Diamond Buffers have a small error (red vs green LED which you can easily swap) but they still work great for most uses. If you are handy with SMT soldering, changing a single LED is no problem.
The red LED can be seen glowing here:
Test case driving 2.83vrms into 2k2ohms gives 0.00035% THD:
https://www.diyaudio.com/community/threads/jhoflands-diamond-buffer-gb.401244/
These boards are great for driving line level signals, and can even be used as a headphone amp as is, or with some tweaks to enable low impedance 32ohm cans. These Xmas Diamond Buffers have a small error (red vs green LED which you can easily swap) but they still work great for most uses. If you are handy with SMT soldering, changing a single LED is no problem.
The red LED can be seen glowing here:
Test case driving 2.83vrms into 2k2ohms gives 0.00035% THD:
is it possible to purchase these boards if we couldn't get into the giveaway? They seem nice for buffering an R2R dac
Yes. I was waiting for folks to get some feedback on any changes. But they boards might just be fine as is.
The UK boards arrived today X. I'll get them distributed to the other chaps as soon as I feel better - currently on my sick bed.
I haven't tried mine out yet, though I am sure they work fine. Been tentatively waiting for some people to post their uses to spur some ideas for myself. I'd like to use them in a preamp / head amp, just not entirely sure what would be good to pair them with.
Great for driving F6. For headphone amp you need to change emitter resistors to get more bias current.
DAC output buffer is also great use case.
The harmonic profile is excellent while maintaining low distortion.
DAC output buffer is also great use case.
The harmonic profile is excellent while maintaining low distortion.
Thanks X. A DAC is something I would definitely be interested in, I will have to start looking to see if I can find something suitable. On my desktop I use a Topping D10s, it's nice but I'd rather DIY something.
Hi X,
Received mine late last week, thank you very much.
I have to try changing D1 for a green one. I’m blown away how small D1 is, no clue how I will do it.
I’ll use your buffer for an headphone amp. Is it ok for you to share more about the changes of the emitter resistors ?
Change to 4.7R. If you go for 2.2R you will need to clamp a silicone heatsink pad and heatsink to the outputs or maybe screw the boards to a flat sink with silicone pad on bottom.
If you want headphone duties the Pocket Diamond Buffer has already been optimized for high bias current with tweaks on the input stage for higher current (7mA) as well:
Outputs are actually FZT953/853:
Implemented with opamp for voltage gain:
Here’s the postage stamp one - about 1mA in the front:
If you want headphone duties the Pocket Diamond Buffer has already been optimized for high bias current with tweaks on the input stage for higher current (7mA) as well:
Outputs are actually FZT953/853:
Implemented with opamp for voltage gain:
Here’s the postage stamp one - about 1mA in the front: