My DIY headphone amplifier design - Page 2

paulb · 24th October 2005, 06:19 PM

I also looked at EuroCircuits but their shipping options seem very expensive.
I'll watch for your results. Thanks.

Paul

cetoole · 29th November 2005, 06:02 PM

Paul, I wasnt able to complete my order with Olimex, due to their requirement for a faxed order form, and when I tried faxing, I couldnt get it to go through. Instead, I got my order added to someone else's panel, he is getting a full panel done, and boards are due sometime this week. I have been looking some more at the layout, and made a couple (relatively) minor changes, caps are now 8mm diameter, so for 10v Panasonic FM, quad 470uf caps fit nicely, definitly should be worth the extra 3mm length I feel. Also added a fuse, redid some traces, and a couple other minor things.

Intersil HA5002 Buffers

paulb · 30th November 2005, 12:18 AM

Hi, thanks for the update. I wouldn't mind hearing more when you receive the boards.
Nice layout. What tools are you using? (you may have already answered this somewhere else, if so sorry). And where are you getting your Alps pots from? I got pricing of about US$28 for small quantities.

cetoole · 30th November 2005, 06:51 PM

My tools include a $35 clone of the Hakko 936esd from Circuit Specialists, with an assortment of tips, usually just a fine conical and ultra fine conical, which have been fine for all of the work I have done so far, including a USB DAC using a PCM2702 IC in the SSOP28 package. Assembling this board will necessitate careful selection of the order that parts are installed, probably opamps, then buffers, resistors, bypass caps, CRDs and TLE, pot, electrolytics, and I/O wires, in that order. Just gotta be sure that you dont solder down something that blocks access to another part. I dont really have anything fancy in the way of tools, the rest of my stuff includes a Fluke 112, desoldering iron, desoldering pump, some dental picks, tweezers, locking hemostats, liquid solder flux, solder (Kester 2% Ag right now, might pick up a pound of Cardas soon), some alligator clips I use to hold smd ICs down while soldering, just position correctly, carefully clamp, and solder, and a Helping Hands. For case work, I have much less, a dremel, a drill with stepped bits up to 7/8", and a heatgun for heatshrink. Wire, I have about 1000' (yeah, I went crazy, bought a 500' spool of 22awg teflon coated stranded SPC, and the same, but in 28awg), about 500' 22awg enamled magnet wire, and some belden 24awg teflon coated copper Plenum rated cat5 cable. The 1000' of SPC was all NOS off ebay, paid around $40 shipped for all of it, none of the stuff was really that expensive. There is some stuff I am looking to get at some point, but only when I find it for a price that I am willing to spend, which isnt much, believe me. I need an OScope most, been keeping half an eye out for school sales of old khz range ones, kinda looking for a gas reflow system, but thats not high on the list, a dmm with accurate hFE tester, but I will just breadboard and calculate for that now, and a drill press. After making you read all of that, I feel it is only fair to share with you a cheaper source for the Alps RK097 switched 10k log taper pots that this amp was designed for, only $3 each from Tangent's Audio Shop, a very reputable store and person, same Tangent as the designer of the origional Mint, Pint, Meta42, Pimeta, PPA. That said, I have been thinking about starting an interest check for a group buy of these pots, to corrispond with, but not be exclusive to, the board buy.

paulb · 30th November 2005, 10:14 PM

Interesting, I have a META42 board right in front of me here.
The tool description is interesting, but I meant PCB layout tools. I like the 3-D graphics out.
Are you using guzzler's USB DAC card? I have one of those in front of me too.

I was looking at the Alps RK27, probably a step up from the RK097.
http://www3.alps.co.jp/WebObjects/ca...K271/RK271.PDF
I have a quote for 100-lot quantities around $8.

I'll check out tangent's store.

paulb · 1st December 2005, 12:32 AM

I see Tangent's got the RK27s (50K) for $16, very reasonable.
Ooh, and there are some SO-8 to DIP adapters for $3...maybe I'll place an order.

cetoole · 1st December 2005, 09:35 PM

Ah, design tools. I use Eagle for the pcb design, and Eagle 3D for the renders, with POV-Ray to do the actual raytracing rendering. Yes, I am referring the the Guzzler USB DAC, I actually am waiting for 2 smd resistors and 2 tantalum caps that I dont currently have, a 10r 1206, 330k 1206, a 10uf tant, and 47uf tant, which I will be getting pretty soon. The RK27 is definitly nicer than the RK097, but take a look at the size differences. Also, RK27 isnt switched.

cetoole · 2nd December 2005, 01:34 PM

Did some more work, really just working on routing improvements, and trying to make the groundplane more continuous.

paulb · 3rd December 2005, 06:53 PM

Would you consider selling any blank PCBs? Or perhaps I could order some through Olimex using your layout?
I have this concept of headphone listening stations throughout my house. Oh, and at work.

cetoole · 4th December 2005, 01:38 AM

I plan to run a PCB group buy for this amp, you could get some boards then. Also, I would be willing to send you eagle or gerber files if you wanted to get some made up, or play with the layout a bit on your own. If you want the files, shoot me an email.

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24th October 2005, 06:19 PM	#11
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	I also looked at EuroCircuits but their shipping options seem very expensive. I'll watch for your results. Thanks. Paul

29th November 2005, 06:02 PM	#12
cetoole diyAudio Member Join Date: Mar 2005 Location: Maryland, USA	Paul, I wasnt able to complete my order with Olimex, due to their requirement for a faxed order form, and when I tried faxing, I couldnt get it to go through. Instead, I got my order added to someone else's panel, he is getting a full panel done, and boards are due sometime this week. I have been looking some more at the layout, and made a couple (relatively) minor changes, caps are now 8mm diameter, so for 10v Panasonic FM, quad 470uf caps fit nicely, definitly should be worth the extra 3mm length I feel. Also added a fuse, redid some traces, and a couple other minor things. Intersil HA5002 Buffers

30th November 2005, 12:18 AM	#13
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	Hi, thanks for the update. I wouldn't mind hearing more when you receive the boards. Nice layout. What tools are you using? (you may have already answered this somewhere else, if so sorry). And where are you getting your Alps pots from? I got pricing of about US$28 for small quantities.

30th November 2005, 06:51 PM	#14
cetoole diyAudio Member Join Date: Mar 2005 Location: Maryland, USA	My tools include a $35 clone of the Hakko 936esd from Circuit Specialists, with an assortment of tips, usually just a fine conical and ultra fine conical, which have been fine for all of the work I have done so far, including a USB DAC using a PCM2702 IC in the SSOP28 package. Assembling this board will necessitate careful selection of the order that parts are installed, probably opamps, then buffers, resistors, bypass caps, CRDs and TLE, pot, electrolytics, and I/O wires, in that order. Just gotta be sure that you dont solder down something that blocks access to another part. I dont really have anything fancy in the way of tools, the rest of my stuff includes a Fluke 112, desoldering iron, desoldering pump, some dental picks, tweezers, locking hemostats, liquid solder flux, solder (Kester 2% Ag right now, might pick up a pound of Cardas soon), some alligator clips I use to hold smd ICs down while soldering, just position correctly, carefully clamp, and solder, and a Helping Hands. For case work, I have much less, a dremel, a drill with stepped bits up to 7/8", and a heatgun for heatshrink. Wire, I have about 1000' (yeah, I went crazy, bought a 500' spool of 22awg teflon coated stranded SPC, and the same, but in 28awg), about 500' 22awg enamled magnet wire, and some belden 24awg teflon coated copper Plenum rated cat5 cable. The 1000' of SPC was all NOS off ebay, paid around $40 shipped for all of it, none of the stuff was really that expensive. There is some stuff I am looking to get at some point, but only when I find it for a price that I am willing to spend, which isnt much, believe me. I need an OScope most, been keeping half an eye out for school sales of old khz range ones, kinda looking for a gas reflow system, but thats not high on the list, a dmm with accurate hFE tester, but I will just breadboard and calculate for that now, and a drill press. After making you read all of that, I feel it is only fair to share with you a cheaper source for the Alps RK097 switched 10k log taper pots that this amp was designed for, only $3 each from Tangent's Audio Shop, a very reputable store and person, same Tangent as the designer of the origional Mint, Pint, Meta42, Pimeta, PPA. That said, I have been thinking about starting an interest check for a group buy of these pots, to corrispond with, but not be exclusive to, the board buy.

30th November 2005, 10:14 PM	#15
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	Interesting, I have a META42 board right in front of me here. The tool description is interesting, but I meant PCB layout tools. I like the 3-D graphics out. Are you using guzzler's USB DAC card? I have one of those in front of me too. I was looking at the Alps RK27, probably a step up from the RK097. http://www3.alps.co.jp/WebObjects/ca...K271/RK271.PDF I have a quote for 100-lot quantities around $8. I'll check out tangent's store.

1st December 2005, 12:32 AM	#16
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	I see Tangent's got the RK27s (50K) for $16, very reasonable. Ooh, and there are some SO-8 to DIP adapters for $3...maybe I'll place an order.

1st December 2005, 09:35 PM	#17
cetoole diyAudio Member Join Date: Mar 2005 Location: Maryland, USA	Ah, design tools. I use Eagle for the pcb design, and Eagle 3D for the renders, with POV-Ray to do the actual raytracing rendering. Yes, I am referring the the Guzzler USB DAC, I actually am waiting for 2 smd resistors and 2 tantalum caps that I dont currently have, a 10r 1206, 330k 1206, a 10uf tant, and 47uf tant, which I will be getting pretty soon. The RK27 is definitly nicer than the RK097, but take a look at the size differences. Also, RK27 isnt switched.

2nd December 2005, 01:34 PM	#18
cetoole diyAudio Member Join Date: Mar 2005 Location: Maryland, USA	Did some more work, really just working on routing improvements, and trying to make the groundplane more continuous.

3rd December 2005, 06:53 PM	#19
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	Would you consider selling any blank PCBs? Or perhaps I could order some through Olimex using your layout? I have this concept of headphone listening stations throughout my house. Oh, and at work.

4th December 2005, 01:38 AM	#20
cetoole diyAudio Member Join Date: Mar 2005 Location: Maryland, USA	I plan to run a PCB group buy for this amp, you could get some boards then. Also, I would be willing to send you eagle or gerber files if you wanted to get some made up, or play with the layout a bit on your own. If you want the files, shoot me an email.