I like this Juma project.
I will still try
http://www.diyaudio.com/forums/analog-line-level/206532-if-you-dont-have-sit-fake-6.html#post2950967
Thiago
I will still try
http://www.diyaudio.com/forums/analog-line-level/206532-if-you-dont-have-sit-fake-6.html#post2950967
Thiago
Attachments
First time I have run a power amp all DC coupled. No caps in signal path. Class A 140mA bias with 15v rail supplies.
Can drive any headphone.
Isn't that design very similar to Patrick's F5 headphone amp except using different JFETs?
Wow talk about simple amps - it doesn't get much simpler than that. 🙂
Nice. I want to get this too. Do you have to use BS170? Could IRF9610's work?
Nice. I want to get this too. Do you have to use BS170? Could IRF9610's work?
Both of those are EUVL (Patrick) designs. Mine is actually 2SK170/2SJ74 but there was no convenient schematic to show hence I said similar. Mine is same as post 1 in that thread. I guess you did not like sound of F5 HA?
Bimo, are R4 and R37 2K ohm trimmers?
I assume the trimmers are for DC offset?
Also, can one use 220uF caps in place of all the 100uF caps?
I notice you used 5mm LS for the 100uF caps and most of the lower voltage ones I've found have 2.5-3.5mm LS.
Thanks.
For those who like no compromise at all:
http://www.diyaudio.com/forums/soli...k3-cfa-pre-phone-amp-very-low-distortion.html
http://www.diyaudio.com/forums/soli...k3-cfa-pre-phone-amp-very-low-distortion.html
Some people asked about top quality pre-amp with SE input and balanced output (XLR). This is the way I would do it:
1) Take Damir's GainWire, mentioned in the previous post (it can also drive the headphones);
2) Add some input selector and volume pot at the input.
3) Add the balanced line driver at the output - that's the way I see it (attached).
That's it. Pro-grade pre-amp.
P.S. This driver stage will also work perfectly with my AmpliWire line stage, mentioned earlier in the thread - >HERE<
1) Take Damir's GainWire, mentioned in the previous post (it can also drive the headphones);
2) Add some input selector and volume pot at the input.
3) Add the balanced line driver at the output - that's the way I see it (attached).
That's it. Pro-grade pre-amp.
P.S. This driver stage will also work perfectly with my AmpliWire line stage, mentioned earlier in the thread - >HERE<
Attachments
Last edited:
Member
Joined 2009
Paid Member
Kulish
There's a very nice pre-amp using opamps designed by Bora. You might ask him for some pcb's - he doesn't want to publish it here last time I asked.
What about a discrete feedforward pre-amp ?
If you want low output impedance you'll need a buffer stage to finish off wth.
There's a very nice pre-amp using opamps designed by Bora. You might ask him for some pcb's - he doesn't want to publish it here last time I asked.
What about a discrete feedforward pre-amp ?
If you want low output impedance you'll need a buffer stage to finish off wth.
Attachments
Other than the added complexity, what would make the no compromise "GainWire" better as a preamp than Bimo's design?
Looks like they both use BD139/140s.
Attachments
Both Damir's GainWire and my AmpliWire utilize current-driven VAS stage and no Miller caps in compensation scheme. I like this approach, showing excellent sonic performance.
Thanks, Valery.
Ahh so we have to resort to an IC op amp for balanced driver ? I don't have a problem as the OPA2134 is one of my favorites and currently the output driver on my DAC.
Simple enough circuit though.
It's also possible to use any discrete differential line stage circuit as an opamp in the balanced driver, but to my taste ... it would be a kind of ... paranoia 😛
OPA2134 at unity gain - excellent wire with gain 😎
A lot of professional mixing equipment is based on opamps, sometimes even less sophisticated, than this one.
Oops! A "typo" mistake on schematic in post #231. Please use the one, attached here.
Attachments
KSC3503 and KSA1381 are always nice upgrades from BD's.
I just finished my F5 preamp/headamp in stereo. This thing sounds really good. I am very surprised how well a CRCLC and 7815/7915 PSU's worked out. Absolutely silent - no hum or any sound whatsoever with music off.
