Zigis
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Evshrug, I can build one for you, if you like. Prototype, based on my own PCB, you can see in post 398.
Details we can discus in PM.
Zigis
Details we can discus in PM.
Zigis
A Super-Simple 6DJ8 Headphone Amp
- Thread starter Nemo de Monet
- Start date
I'll reply to your PM, but I'd just like to say (again?) to all the DIY'ers who are tweaking and experimenting, I am continually impressed by your enthusiasm, desire for knowledge and eeking out just a bit more performance, and community spirit.
A little random? Maybe. But where do discoveries come from, and how do we get new product configurations?
A little random? Maybe. But where do discoveries come from, and how do we get new product configurations?
Zigis
100+ Head-Fier
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I ordered new bunch of PCBs again, without changes.
3 boards will be left over, so if anyone are interested, let me know.
Boards will be ready at the end of next week.
3 boards will be left over, so if anyone are interested, let me know.
Boards will be ready at the end of next week.
After already built one zigis board , I am interested in one more.
Too say that I was impressed with the sound would be an understatement.
However, I do not need more space for bigger caps, but if majority here decide on the new layout I will obey.
Lol same here, and I am excited that the new order is underway!
I've been slowly reading this thread, read the last few pages before my first post, and since then about a page a day starting at the beginning. I think it's fascinating that Zigis built his first version of this amp over 3 years ago! I've been learning a lot just reading this thread and the Bravo tube amp thread, but Zigis must've learned a whole lot since then! Ludoo too, but... I'm not sure I'd hear the difference in the even bigger caps, lol.
jpaul64
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Hi, two questions: what is the max. output power for 32R and 300R headphones? Thanks
jpaul64
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I hope its successfull? ALT COPY and CTRL V! Schematics and Layout for new PCB.
jpaul64
New Head-Fier
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I hope its successfull? ALT COPY and CTRL V! Schematics and Layout for new PCB.
jpaul64
New Head-Fier
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nothing to see! Lets try jpeg...
ludoo
1000+ Head-Fier
Pasting images in the editor does not work: images are only viewable in the edit window. Here are your images as proper attachments (image icon, then upload)
jpaul64
New Head-Fier
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thanks Ludoo! Bizarre, my problem with the "insert image" icon is solve?!
Hammond 1444-24CWW chassis.
TKD CP-2500 or ALPS RK27112.
MKS4, Mundorf MCAP or ZN coupling capacitors.
The output capacitors are MKS4 220µF/50VDC/30VAC from WIMA, or electrolyt capacitor.
Iset resistor can be MRA5 (5W), PR02 (2W) or MP930 (TO220).
Tube, MOSFET and regulator on the top of the PCB.
Board is 200x150mm.
Hammond 1444-24CWW chassis.
TKD CP-2500 or ALPS RK27112.
MKS4, Mundorf MCAP or ZN coupling capacitors.
The output capacitors are MKS4 220µF/50VDC/30VAC from WIMA, or electrolyt capacitor.
Iset resistor can be MRA5 (5W), PR02 (2W) or MP930 (TO220).
Tube, MOSFET and regulator on the top of the PCB.
Board is 200x150mm.
Jpaul,
"Quote" ludoo's post to see the HTML code to post a picture.
If your image is already on the web, you can copy it and post it this way:
[ IMG ALT=""]paste URL of pic here[/ IMG]
Delete the spaces before IMG. There should still be a space between IMG and ALT.
Is this your version of the design? Have you built it yet? How much did it cost with those Mundorfs?
I think the PCB layout pic looks like a brain, with left and right hemispheres.
"Quote" ludoo's post to see the HTML code to post a picture.
If your image is already on the web, you can copy it and post it this way:
[ IMG ALT=""]paste URL of pic here[/ IMG]
Delete the spaces before IMG. There should still be a space between IMG and ALT.
Is this your version of the design? Have you built it yet? How much did it cost with those Mundorfs?
I think the PCB layout pic looks like a brain, with left and right hemispheres.
jpaul64
New Head-Fier
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The grey outlined parts on the BOT; the brown outlined on the TOP. Heatsink should be a big custom one (simple alu bloc) thermally contacted to the metal cover of the case (Hammond or other).
Low cost version: first start with the PCB. WIMA or any cheap MKT/MKP RM7,5mm. Electrolyt capacitor ELNA, PANASONIC and ALPS. No Mundorf or big output WIMA coupling capacitors.
Waiting for christmas then upgrade: MUNDORF (coupling input capacitor for 2.6€ or 7€ and fast decoupling capacitors for 2,5€); WIMA MKS4 220µF/50V (don´t know the price? perhaps 10€/piece); Caddock MP930 8R0 (or other TO220 thermally coupled with the Mosfets). Forget the ALPS and choose TKD CP-2500 or better my coming standalone volume control.
Two in serie VISION LiFePO4 +12VDC batteries (charging like gel batteries but with higher current) with Meanwell charger.
The board is big enough for some experimentation. 30€/piece for 50 pieces ordering at PCB-POOL. Cheap amplifier if grouped ordering!
Low cost version: first start with the PCB. WIMA or any cheap MKT/MKP RM7,5mm. Electrolyt capacitor ELNA, PANASONIC and ALPS. No Mundorf or big output WIMA coupling capacitors.
Waiting for christmas then upgrade: MUNDORF (coupling input capacitor for 2.6€ or 7€ and fast decoupling capacitors for 2,5€); WIMA MKS4 220µF/50V (don´t know the price? perhaps 10€/piece); Caddock MP930 8R0 (or other TO220 thermally coupled with the Mosfets). Forget the ALPS and choose TKD CP-2500 or better my coming standalone volume control.
Two in serie VISION LiFePO4 +12VDC batteries (charging like gel batteries but with higher current) with Meanwell charger.
The board is big enough for some experimentation. 30€/piece for 50 pieces ordering at PCB-POOL. Cheap amplifier if grouped ordering!
What is the output impedance that the headphone "sees" with this amp?
KimLaroux
1000+ Head-Fier
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Yeah, I saw that, but admittedly my knowledge on amp component effects is minimal. Zigis theorized that the 10 Ohm resistor is there to keep from blowing out headphones as you connect them while the amp is powered on, yet amps like the FiiO E11 somehow manage with measured output Ohms of > 1 Ohm. And who knows if that the measured ohms would match the rating of that one resistor?
How do other amps compensate for the headphone insertion event, and would a resistor of a smaller value be adequate (like 5 ohms)?
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