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Post by Deleted on Dec 10, 2011 10:44:09 GMT
Here you go Chris, Apologies for the pic quality, and I should have dusted it off as its been sitting idle on my desk for yonks. cheers.. jeffc Hi Jeff Nice work. i really like your battery work really neat and compact. take care
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Post by Deleted on Dec 10, 2011 14:08:35 GMT
Jeff, that's very tidy! To save me trawling through the thread, what are the ratings of the caps used on the 9023 in this manner. I fancy a go! Cheers EDIT = No worries, I trawled, I found
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Post by jeffc on Dec 10, 2011 21:12:11 GMT
Hi Chris, Fine-nosed forceps will be your friend. Just hold in place across the chip pins and hit one end of the 2.2uf X7R cap briefly with the soldering iron tip for a temp hold, wait and then flow a little additional solder on the other end for a good joint, wait a little, and then do the same at the temp end. The same for the cap positioned vertically but be careful when adding the tiny wire link so as to not strain the cap, they're quite fragile and can snap . How do I know this? cheers.. jeffc
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Post by Deleted on Dec 11, 2011 19:17:48 GMT
Jeff,
Thanks for the tips, the caps will be on my next order.
Ta much,
Chris
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Post by Deleted on Dec 11, 2011 22:49:43 GMT
HI Chris, glad you got the boards hope you find good use for them Regards, Alan
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Post by Deleted on Dec 12, 2011 0:19:17 GMT
Certainly will Alan, hopefully in action by the end of today (Monday). > > > > 'Cos I eat Marmite, baby!
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Post by Deleted on Dec 13, 2011 0:22:03 GMT
Well, here they are all tested and correct.... I had to chuckle at the size of the proposed PSU against what it will be powering ;D Alan, before you say "She's gonna blow captain!", I took the precaution of grinding away the conductive planes around the pillar mounting areas, making them inert. Cheers.
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Post by Deleted on Dec 13, 2011 0:36:08 GMT
Hi Chris, those metal pillars set them off nicely what are you running off the power supply? Alan
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Post by Deleted on Dec 13, 2011 2:22:57 GMT
Hi Chris, those metal pillars set them off nicely what are you running off the power supply? Alan Hi Alan, The Sabre Dac of this thread, 2 x 15v (fed from a 15-0-15 TX) boards running into two AK Crickets, one set for 3.6v and the other for 3.3v to runt the oscillater and the 9023 respectively. The 2 x 5v (fed from a 6-0-6 TX) will power the I2S board that feeds the Sabre. Just one 5v for now until I sit down and work out were to feed the second one in. Obviously these JLHs need some decent running in, is there a recommended resistor to put across the output for this purpose? edit Oh Syd! Don't forget if you want higher voltages out of these you'll need a larger value VR (R2), I just remembered in time
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Post by Deleted on Dec 13, 2011 9:07:55 GMT
Hi Chris no OP (load) resistor needed just plug them in and leave them on for a few days. great work on the DAC. it will be interesting to hear your thoughts on the split PSU with crickets. take care
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Post by jeffc on Dec 13, 2011 9:43:27 GMT
Hi Chris, You've been busy.... long service leave, early retirement or been made redundant Like Shaun, I'll be interseted to hear how the AK Crickets perform togther with the JLHs. cheers.. jeffc
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Post by Deleted on Dec 13, 2011 11:36:22 GMT
Hi Chris, my set up with the "ADD" using four in the PK took ages to settle in...........and I mean ages, but I wouldn't change them out now as I'm very impressed with what I'm hearing. Of course you have to remember that I'm really not much of an audiophile and whilst my PK/Sandyk are up there with the best, as a very respected RG member has pointed out the weak link in my audio chain will be my dearly beloved old Quad 405.....that hurt...... not to mention the last link being equally ancient......my hand built DIY 1970's era speakers. Just wish I could drop into Sydney for a sample of Alex's Hi-res audio that would surely give me a reference point. I've not got round to looking at the "Cricket" but that's in the pipeline for trying out sometime soon. Regards, Alan
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Post by Deleted on Dec 14, 2011 15:19:33 GMT
Shaun, thanks for the info. I reckon the JLHs will be left cooking until next Monday, I'm assuming that'll be plenty of time... Don't take it too hard Alan, I have a soft spot for mid-age Quad kit as well. 34, 44, 306, 405/II. They are just plain "nice". Far less keen on their later offerings, I thought they lost their unique identity both sonically and visually. I say old chaps, it's just not cricket ;D Noooo! Monday is my day off, which usually means kiddy runs as normal, wifey's DIY list, paperwork, get fed...Hoorah!, then finally me-time until the sandman beckons. Cheers all.
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Post by Deleted on Dec 14, 2011 21:31:31 GMT
X2
i owned the 2/22 for a few years
take care
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Post by Deleted on Dec 16, 2011 13:18:11 GMT
More head scratching going on! With the USB I2S board that I'm patching into the PK, I was hoping to feed some nice JLH voltages straight into the I2S. The 5v is obvious to go in at the clearly marked 7805 reg position. I'm assuming that I can also inject 3.3v at the point marked below. The markings on the reg. don't point to anything in a search so I'm guessing it's 3.3v reg. like this one? Waddya fink folks? TIA Attachments:
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Will
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Post by Will on Dec 16, 2011 20:06:47 GMT
Hi Chris,
That's the way I would do it. It's better if you can remove the reg first, and inject the 3v3 directly in.
What could be happening is that the 3v3 is being derived from the 5v line. The nice clean JLH 5v will have noise added to it by the 3v3 reg, so getting rid of that reg, and feeding 3v3 from an AK cricket/JLH will give a cleaner voltage. Worth trying to trace the circuit out, and remove other regs on board so that you can feed in better quality supplies.
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Post by Deleted on Dec 17, 2011 0:05:03 GMT
Hi Will,
Yes, that was exactly my line of thinking.
I've been cheeky enough to ask the seller if I can have a circuit diagram of it! I wonder if they'll oblige?
As far as I can tell thus far, the 7805 is only used with plug in power with the 3.3v volt running in turn from that OR from USB power when swithed in.
Cheers.
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Post by Deleted on Dec 19, 2011 10:25:08 GMT
I went for a fire up on the basic version of the new set up.
i.e. 2 x "ADD" psu/jlh hybrids, running at 15vdc each. These are feeding two single AKcrickets, one set for 3.6v for the the TXO and the other at 3.3v for the 9023.
The I2S board was receiving USB injected power and passing data to the PK as before.
Problem, no sound.
The only possible pointer I have found thus far is the voltage reading for the 9023 power input reads at only 1.55v under load. Rechecked without load and is happy at 3.3v.
Any thoughts very welcome.
TIA
Chris
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Post by Deleted on Dec 19, 2011 10:45:31 GMT
Chris, wasn't it the other way around? (3.6V for the 9023 and 3.3V for the XO)
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Post by Deleted on Dec 19, 2011 11:28:43 GMT
Chris, wasn't it the other way around? (3.6V for the 9023 and 3.3V for the XO) Shoot me now, I'm a lunatic! Thank you Javier, you're dead right. In the meantime I had removed the Crickets from the chain and returned to two 3.3v ADD/JLH supplies. All is well like this so the XO survived the experience. Interestingly, set up this way there is no voltage drop for the 9023 under load, , which bothers me somewhat. Is it possible the over-voltage on the XO could have caused this? Do I need to change anything else on the 3.6v Cricket? The only change I made was substituting the 3v3 diode for a 3v6.
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Post by Deleted on Dec 19, 2011 12:44:17 GMT
Hi Chris You may be trying to draw too much current from the Cricket. Try a 1 ohm resistor in series with the supply to it, and measure the voltage drop. You can then work out the current draw using Ohms law. Trying to draw much more than 30mA with most opamps could be a problem. Regards Alex
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Will
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Post by Will on Dec 19, 2011 19:32:12 GMT
I'm with Alex on too much current being drawn. You could try stacking two op-amps on top of each other in the cricket, and see if that gives more current....just a thought.
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Post by Deleted on Dec 19, 2011 22:33:29 GMT
Back on the case! Thanks for the replies. Will and Alex, I have a current draw of 50ma so certainly above the 30ma Alex suggested as a maximum. The theory on stacking the opamps, does that give roughly double the current of the one? If so that would be worth a bash Cheers.
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Post by Will on Dec 19, 2011 22:38:28 GMT
Pretty much the case on stacking op-amps. I was after a higher current cricket a while back, and Alex (as always) suggested it.
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Post by Deleted on Dec 19, 2011 22:38:55 GMT
Hi Chris What Will is suggesting is an old trick, and certainly worth trying. Use the heat and solder sparingly though .Both opamps must be of the same type of course. Alex P.S. You will see little heatsinks stuck on in some of my photos.
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