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Post by PinkFloyd on May 22, 2008 12:55:35 GMT
This fekkin' JLH diagram is a bugger to figure out Alex!! I just copied what you have done and to hell with it.... why have you got c11 reversed? According to the diagram it's the wrong way round anyway..... nothing worse than crap diagrams is there?  She's certainly a lot smoother now (with the toshibas fitted) so obviously everything is where it should be now.... I was beginning to think I'd gone mad there! Will take a few snaps of the correctly populated JLH later. Yes. Alex, I have fitted the 100R "under" the PCB. By the way....... it ROCKS like fck' with the LM4562 now  |
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Post by Deleted on May 22, 2008 13:20:53 GMT
mini JLH layout. The bottom of the new PCB is slightly different, but component placement is the same.  |
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Post by Deleted on May 22, 2008 13:25:05 GMT
Mike
C11 was mentioned in the email I sent. My posted schematic didn't have a C11.
A really low PSU impedance right across the band makes a big improvement over ordinary (or fancy) capacitors, doesn't it ?
The JLH isn't too bad a design is it ? Lots of uses in other gear too.
Alex
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Post by PinkFloyd on May 22, 2008 14:22:54 GMT
Alex, if we are going by the diagram then B639/640 are the wrong way round in your photo? Looking at your photo the emitters are connected the wrong way round:  |
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leo
Been here a while! 
Team wtf is it?
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Post by leo on May 22, 2008 19:16:46 GMT
Might be worth checking the datasheet for those transistors chaps, I've just had a look at Fairchilds for the BC639 and its pin out is different to that pic above . (the pic/diagram Mike posted)  I have noticed before that say Onsemi has a different pinout to the same transistor type as say Philips |
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Post by PinkFloyd on May 22, 2008 20:31:24 GMT
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Post by PinkFloyd on May 22, 2008 21:01:52 GMT
Checked, double checked and triple checked:  It sounds so much more refined with the JLH Alex, no doubt about it, more defined with a greater degree of air around the performers.... a very high quality sound and such a "clean" sound too! So clean, in fact, you can turn the volume right up and not even be aware that you're listening to your music "LOUD"..... absolutely beautiful! You asked me earlier how I felt this compared with most commercial amps...... it doesn't..... it's leaps and bounds better and, for the price, the amp bargain of the Millenium IMO. |
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Post by PinkFloyd on May 22, 2008 21:06:58 GMT
Mike Did you get a chance to listen to the TonyG compilation CD ? I was gobsmacked by the Led Zepellin track, as I didn't much like them originally. Even Chris Isaak surprised me. AS for Yim Hoh_Man-Poem of Chinese Drum,that sure has a lot of power at the low end ! Alex Yes, quite good in places.... one of those places being "Don Dorsey - Ascent" with the volco at the 5' o' clock position  |
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Post by Deleted on May 22, 2008 21:19:23 GMT
Mike
I am happy that we at last have a kit amplifier to replace the one that unfortunately never materialised, and perhaps even higher quality? I hope that some of the members sitting on the sidelines will now be tempted to have a go at building one for themselves. I imagine that you will be putting together a suitable pictorial guide in the usual Pink Floyd fashion, without all the unnecessary stuff ? I just wish that we could get better looking cases to complement the performance !
Alex
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Post by Deleted on May 22, 2008 21:29:12 GMT
Mike
That particular CD was more for loudspeaker use. "Ascent"on a good speaker system, fills the entire listening area with sound.The other Don Dorsey track has a surprise ending, that on a good speaker system can frighten shit out of you ! (if you can listen right through it !)
The TonyG compilation (Thanks Tony !) is more suitable headphone material.
Alex
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Post by PinkFloyd on May 22, 2008 21:32:14 GMT
Mike I am happy that we at last have a kit amplifier to replace the one that unfortunately never materialised, and perhaps even higher quality? Superb quality Alex and I doubt if the kit that was proposed would be able to match it sonically.... one thing's for sure it would certainly not have come anywhere near in the VFM stakes. Yup.... so do I Alex. The build is pretty much painting by numbers and the amp itself is bullet proof. Nothing more satisfying than a kit amp which is easy to build, fires up first time and sounds fantastic is there? Well..... if someone who can't be arsed soldering wants to send me their kit I'll be happy to populate the PCB for them and take step by step photos..... no probs at all. Dunno about you Alex but mine's going into a fancy "galaxy" enclosure  |
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Post by mistergreen on May 22, 2008 21:32:41 GMT
I'm pleased to see that both parcels arrived quickly and safely.  I have ordered my parts to finish the HA from Jaycar. I didn't realise how many bits and pieces would be needed. Alex (kittenyberk) how long did your parts take to arrive from Jaycar? I ordered my kit a month and a week ago. Still nothing. I've e-mailed jaycar and they've said they've re-sent it. Which is nice. I guess. |
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Post by PinkFloyd on May 22, 2008 21:38:18 GMT
Mike That particular CD was more for loudspeaker use. No such thing as more suitable for loudspeaker use Alex.... music is music! Listening to it now..... Chinese drums at full volume.... VERY good recording you can even hear the resonance of the drum itself. |
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Post by Deleted on May 22, 2008 22:23:28 GMT
Mike
What are you using for the source ? I know that many people don't like the PC route,
(I didn't until recently!) but if you have a good soundcard with decent analogue out,and are able to bypass the Microsoft mixer by using the Soundcard's ASIO drivers, this HA will reward you with even higher quality than you are able to get via a normal CD player, or even via a high quality non PC based CD/DVD player and DAC. It bypasses all that laser reading and processing etc, with all it's inherent jitter, and also player PSU limitations etc.
Seriously !
Files can either be ripped to the HDD as an uncompressed .wav file using E.A.C. ,OR even via the soundcard's own player using your CD/DVD writer. HDD seems to have a slight edge though.
Alex
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Post by hooograa on May 22, 2008 23:42:08 GMT
I've got my altronic kits together. So now comes the finishing bits. I've noted that Alex uses the altronic toroidal so no need for more expensive units there. With the capacitors Mike uses blackgates, fine gold, silmic and others. Alex uses what looks like what I got with the altronics kit. So how much capacitor rolling has happened? Is there any need ? The fast recovery diodes that improved my V2 any use here? The LED on the power supply would be any lumen's value but 5v, right? I'm asking these things before I order the toroidal so I get it all together. As it is all I really need do is hook it all together and go listen. Thanks David
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Post by Deleted on May 23, 2008 0:28:23 GMT
David
I am not a believer in expensive capacitors in non power amplifier filtering applications.In Power Amplifier applications the higher priced,brand name electros may have a higher "slew rate", which is the abilty to more quickly supply power on demand. I prefer to use very low impedance supplies wherever possible , where their low impedance negates most of the benefits of the more expensive filter capacitors. Regarding the LED, I posted a suggested option for the PSU unit, where the unused 5V regulator was not fitted, and a 10Kohm (nominal) resistor was provided to limit current through the front panel LED, so that it was not too bright.
You could also use it with the 5V regulator fitted, but in that case, you would have to fit a 1Kohm resistor (or higher) in series with 1 lead to the LED. You could use the fast recovery diodes in the PSU, but due to the JLH, they may not make any noticeable difference. Don't forget that a JLH can be added at a later date, as it goes in between the PSU and the HA PCB. I suggest that you try and leave enough room, in case you wish to fit one at a later date. It really is the "icing on the cake."
If you don't intend fitting a JLH ,sooner, rather than later, I suggest that you use capacitors much as Mike has done.
BTW, where abouts in Oz are you ?
Alex
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Post by hooograa on May 23, 2008 1:32:14 GMT
Katoomba, Thanks Alex
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Post by Deleted on May 23, 2008 5:38:40 GMT
Files can either be ripped to the HDD as an uncompressed .wav file using E.A.C. ,OR even via the soundcard's own player using your CD/DVD writer. HDD seems to have a slight edge though. Alex Alex, what about FLAC ?  |
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Post by Deleted on May 23, 2008 5:44:54 GMT
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Fergus
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Post by Fergus on May 23, 2008 15:43:50 GMT
Wow, what a great little kit!!! I'll certainly be investing in one. Any idea of the postage costs from Australia?
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Post by rossman on May 23, 2008 19:34:01 GMT
I've just spent some time on the kit and have got as far as fitting all of the 0.5W resistors. Only one problem, as I will be fitting a 50k pot I needed to fit links but had run out of the tinned copper wire. I have stripped some solid core from some DNM cable and used it but I am wondering if it would be better tinned to prevent oxidation? Wow, what a great little kit!!! I'll certainly be investing in one. Any idea of the postage costs from Australia? postage is £5 from Jaycar but it doesn't seem be in stock at the moment. I don't know about Altronics as I haven't ordered from them, why not check out their website! |
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Post by PinkFloyd on May 23, 2008 19:49:09 GMT
I needed to fit links but had run out of the tinned copper wire. I have stripped some solid core from some DNM cable and used it but I am wondering if it would be better tinned to prevent oxidation? Just use the legs you snip off the capacitors / resistors, perfectly good Paul. Mike uses blackgates, fine gold, silmic and others. I never use black gates hoogra. The ones I have used in the jaycar are pana FM, Samwha VA series, Rubycon and Elna RE2J (all 105c temp rated) no particular reason I used these caps other than they were to hand. Build the kit up using the stock parts first to give yourself a reference point. You can then add/ subtract different flavours of caps and actually "hear" if they make an improvement or not.... the secret here is to do it slow...... don't just whack in a handful of boutique caps and bolt the hatch down, there's no fun in doing it that way. |
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Post by PinkFloyd on May 23, 2008 20:27:11 GMT
Got some more Toshibas today (Thanks canjunkie) and that's them now fitted in the JLH and the amp. It's certainly a better amp with the toshibas and JLH on board, they both add a degree of refinement to the proceedings and enlarge the overall scale of the performance in an exceedingly classy way..... the toshiba and JLH ripple eater transform the amp from grape juice into fine wine. EDIT: LM4562 on board.... you were right Alex, with the JLH and Toshibas it really does sing a nice tune.  Dont walk, RUN, to your nearest stockist of this kit folks.... it's a cracker! |
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Post by rossman on May 23, 2008 20:45:29 GMT
Just use the legs you snip off the capacitors / resistors, perfectly good Paul. That did occur to me after I had fitted the DNM links, but as they seemed a bitter thinner I thought I had better check.  |
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Post by ticktockman on May 23, 2008 21:26:18 GMT
Sorry to be overly dense but what is the supply position on these headphone amp/power supply kits. Has Jaycar got any coming in, can they be sourced from elsewhere. Has anyone got any stock anywhere. I want one,(kit) but frankly the thread needs cleaning up for clarity of purpose imo.  . Still fascinated by the potential of the ripple buster as my JLH phono stage(Hart electronics) needs a little help. Its power supply has two 15v+/- dc outputs so could I use the spare one to run the headphone amp(mind you the P/s kit is soooo cheap). |
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She's certainly a lot smoother now (with the toshibas fitted) so obviously everything is where it should be now.... I was beginning to think I'd gone mad there!
