I did not measured V access it, but I see very low current is running through it during continues operation. It's blinks for 1/2 sec during start as well as my green LEDs and still show very little light after that. Greens are totally off after initial blink. Not big deal with such Vdrop for me since I have sufficient margin.
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk
Sorry, I never got the notification that this thread has changed. It's better to PM me because sometimes I never find out when someone posts in the thread.
Luckily, there is good news however. I have new PCBs with corrected silkscreen. So if you still want boards, let me know.
As for BOM, this image covers a few different options for the board.
Luckily, there is good news however. I have new PCBs with corrected silkscreen. So if you still want boards, let me know.
As for BOM, this image covers a few different options for the board.
Attachments
As for BOM, this image
covers a few different options for the board.
Can the LED be replaced with LM336, 2,5V? Specifically, this at least could be good for the higher current version. [Sorry should try first but I'm lazy in the summer
Thank you guys I will use the knult on my new power amp just after the voltage doubler.
Please heva a look at what is happening here..... http://www.diyaudio.com/forums/soli...r-amplifier-assemblage-vii-2.html#post4866372
Please heva a look at what is happening here..... http://www.diyaudio.com/forums/soli...r-amplifier-assemblage-vii-2.html#post4866372
I have just build a Keantoken cfp according to the stock schematic with C1 = 470uf nichicon fw, cout = 220uf, r1 = 220R instead of 47r and r load = 10ma, npn = bc337, pnp = pzta56. I measured it with the QA400 connected to external 38db amp, the Keantoken was feed from lt3471 step up from 3.7v battery to 7v. Here is the result:
Look quite good but using the same setup, i swap the Keantoken for a simple capacitance multiplier (C1 = 470uf), noise figure is significant better:
The Lt3471 alone:
And Lt3471 with tps7a4701 look the best:
People often blame the Lm317 for it noise but i found it to be very good ( this is a desktop power supply using transformer):
Look quite good but using the same setup, i swap the Keantoken for a simple capacitance multiplier (C1 = 470uf), noise figure is significant better:
The Lt3471 alone:
And Lt3471 with tps7a4701 look the best:
People often blame the Lm317 for it noise but i found it to be very good ( this is a desktop power supply using transformer):
Last edited: