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Post by PinkFloyd on Mar 15, 2008 23:45:33 GMT
Another potential project for later ;D we could draw out a nice little pcb for this chip, add in some kick arse regulation should prove quite interesting Shall we do it Leo? I'm game and will fund 200 PCB's for starters, let's get a basic design down on paper between us and experiment with peripherals ok? The Ultimate AKG driver
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Post by PinkFloyd on Mar 16, 2008 0:09:32 GMT
Let's do it Leo! A dedicated K-501 / 601 / 701 driver (K-1000 even)...... I'm up for it if you are?
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Post by Deleted on Mar 16, 2008 0:54:55 GMT
Having previously used LM377, LM379, and LM380, I would say that the LM380 certainly isn't anything to write home about ! SandyK
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Post by PinkFloyd on Mar 16, 2008 1:34:29 GMT
Having previously used LM377, LM379, and LM380, I would say that the LM380 certainly isn't anything to write home about ! SandyK You're deaf tho aren't you?
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leo
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Post by leo on Mar 16, 2008 2:04:00 GMT
I'm sure we can come up with something if theres enough interest, I've never tried this chip yet so may have a go at hardwiring one up first, see how much potential it has although Alex hasn't filled me with confidence
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Post by Deleted on Mar 16, 2008 2:04:14 GMT
I do have hearing damage courtesy of Telstra employment, and my hearing in right ear varies with blood pressure. Shit, I can't hear a thing with my right ear, some f'wit must have upset me with such a nasty remark ! Anyway, Rick posted a while back about people with hearing damage being able to sometimes discern things that other can't re audio deficiencies. In any case, several Grotto members are able to better comment on whether this hearing damage has affected my ability to listen to and modify gear for extremely high quality ? I am sure you are aware that one of the guys on your extended listening panel has already been able to tell for himself whether I am completely deaf or not , and whether I am able to judge audio quality ? DC1
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leo
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Post by leo on Mar 16, 2008 2:07:49 GMT
This classA amp sounds damn fine though! not bad to say its been tuned by a deaf old fart eh
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Post by Deleted on Mar 16, 2008 2:15:27 GMT
Leo If you get a chance , make up one of those JLH PCBs for "Mr. Nasty", and he can see for himself just how bad my hearing really is ! Alex
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Post by leo on Mar 16, 2008 2:27:06 GMT
Soon as I can find a good priced UV box, may actually have a bash at building one My mates got a scanner thats faulty so may rip the innards out and fit a couple of small tubes in there, should make a decent little light box
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Post by Deleted on Mar 16, 2008 2:45:45 GMT
Leo If I remember correctly, I think I sent you something about Photo PCB making ? That just happened to come from an article describing a DIY UV box. I will scan it later. Alex
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Post by leo on Mar 16, 2008 3:17:24 GMT
I'll check through my mails, I've no problem with doing the boards, its finding something thats suitable for providing the UV
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Post by leo on Mar 16, 2008 3:19:17 GMT
Be nice to have some project that most folks on here could join in with too Any idea's?
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Post by Deleted on Mar 16, 2008 3:44:15 GMT
Leo The UV box is a fairly complex project,could give you a few ideas though. If I can find the article again ! Alex
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Post by leo on Mar 16, 2008 3:49:03 GMT
Ok taa, regarding what I said about it would be nice finding a project for people to join in on here , I meant an amp project, not sure what exactly yet
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Post by PinkFloyd on Mar 16, 2008 16:15:40 GMT
Bloody hell Sandy, I was joking..... I didn't realise you actually were partially deaf My apologies mate, I can sometimes be as subtle as a house brick
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Post by canjunkie on Mar 16, 2008 22:37:16 GMT
Warning - [glow=red,2,300]saddo post alert[/glow] - I got bored I just couldn't resist having another little go at her Thought some nice gold plated phono sockets would do nicely.... Then I remembered I asked Mike to send me an extra purple LED so.... Also had a black ali knob which I didn't like on the X-Cans. Wasn't completely happy with the joints on the Rifa so re-done them. Finally thought I'd have another crack at bypassing power cap...... ;D Powered her up and she's a lot less noisy I'd love to think it was those nasty old sockets or the corrosion on the old power LED leads or even the cap bypass but most likely damaged one of the solder joints when I re-fitted the Rifa when it was fouling the lid. The project ideas sounds interesting - wouldn't mind having a go at a build - design goes over my head
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Post by senj on Mar 17, 2008 12:24:12 GMT
I'd love to do a build too.
What a joke. I had to buy some Isopropyl from the internet because no one has it.
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Post by senj on Mar 20, 2008 16:47:03 GMT
Just finished cleaning the board after soldering. Before: After: Anyone see any problems, before i put it back in and fry some headphones?
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Post by PinkFloyd on Mar 20, 2008 17:53:12 GMT
Looks absolutely fine senj.... go and fire her up and see how she sounds
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Post by senj on Mar 21, 2008 9:30:12 GMT
I'm still getting the background hiss. Are you getting a hiss and a slight crackle on yours too? It's noticable at the quiet passages. I might open her up again and check the soldering.
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Post by Deleted on Mar 21, 2008 10:06:57 GMT
Mike and senj Why is there a WIMA .1uF capacitor across the diode near the DC input jack ? Does the other side of this diode connect to the on/off switch ? If so, it should not be there. If this diode is in series with the input from the DC supply, it will provide reverse voltage protection, as well as giving a little extra filtering, due to acting like a small value resistor between the output filter capacitor of the PSU and the input filter capacitor of the amplifier.(In effect, a CR network) In this case , connecting a capacitor across it will let more HF rubbish from the PSU through, although the extra 50/100HZ ripple rejection won't suffer. SandyK
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Post by PinkFloyd on Mar 21, 2008 11:03:54 GMT
I'm still getting the background hiss. Are you getting a hiss and a slight crackle on yours too? It's noticable at the quiet passages. I might open her up again and check the soldering. Depends on what 'phones you are using with it senj?? If low impedance then, yes, there will be a slight hiss at zero volco. Totally silent with higher impedance cans.
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Post by senj on Mar 21, 2008 11:19:41 GMT
I'm using the Ergo 2s. Which are about 100 ohms i think. Could it be the QED power supply i got with the amp?
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Post by k2col on Mar 21, 2008 23:06:47 GMT
I'm using ATH-500s which are 62ohms I think, and I get a low level of background hiss, although its soon lost amongst the music. Over time I'll try other headphone & amp combinations (the Doudou group buy is tempting me, but I think I'll try new phones first) as I'm fairly content for the time being.
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Post by senj on Mar 27, 2008 21:37:56 GMT
Whats the K501 like with this amp? I just brought a pair from head-fi, should be arriving in a couple of days.
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