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| sijosae Joined: N/A |  Message [#1] posted on: 10-21-2003 04:13 AM CST (US).   |  |  I built a tiny Apheared 47 again. Instead of TLE2426, I used discrete rail splitter. This is a schematic of the discrete rail splitter. Protoboard version with caps. My first SMD PCB version by using toner transfer method. This rail splitter work well even with a single 1.5V battery. This is an Apheared 47. I did not build a proper case yet. [Edited by sijosae on 10-21-2003 at 09:37 AM.] |
morsel  Headphone Council Joined: Mar. 21, 2002 | Message [#2] posted on: 10-21-2003 06:24 AM CST (US). | | Very cool, Sijosae! Is the TLE2426 hard to get in Korea? |
| sijosae Headphone Council Joined: N/A | Message [#3] posted on: 10-21-2003 07:16 AM CST (US). | | Thanks, Morsel Not easy, but it is possible to get TLE2426. I have about 30 TLE2426s. To enjoy DIY itself, I built this rail splitter. |
| 300_baud HeadWizer Joined: Aug. 23, 2002 | Message [#4] posted on: 10-21-2003 10:07 AM CST (US). | | Hi Sijosae, Nice job again as always! |
| goldbond Member Joined: Aug. 1, 2003 | Message [#5] posted on: 10-21-2003 12:27 PM CST (US). | | What sort of sockets are you using for the ICs, Splitter, and input/output lines? I tried to locate some of these for my most recent project, but to no avail. |
cmoy Administrator Joined: Apr. 13, 1999 | Message [#6] posted on: 10-21-2003 02:06 PM CST (US). | | Sijosae, there's so much room left in the box!!  Very nice and thanks for posting that circuit for the discrete rail splitter. What is the max. current output of the discrete splitter? [Edited by cmoy on 10-21-2003 at 07:06 PM.] |
| sijosae Administrator Joined: N/A | Message [#7] posted on: 10-21-2003 05:53 PM CST (US). | | Goldbond, in Korea, we call those sockets "IC strip socket". This socket is very common in here. Cmoy, |
| stereth HeadWizer Joined: Jan. 10, 2003 | Message [#8] posted on: 10-21-2003 09:10 PM CST (US). | | Very nice work on the rail splitter. I know those things aren't easy to solder. Nice photos too. What kind of a case is that? Looks a little bigger than the mint tins we have around here. goldbond, yes, they're strip sockets. You buy them in rows of 40 or so and cut to whatever size you need. And they look very nice on that PCB... |
| sijosae HeadWizer Joined: N/A | Message [#9] posted on: 10-22-2003 06:01 AM CST (US). | | Thanks, Stereth. This is a mint tin case. "Velamints Chocolate Mints" Size of this tin is smaller than Altoids one. |
aos HeadWizer Joined: Jun. 15, 2008 | Message [#10] posted on: 10-22-2003 07:33 AM CST (US). | | sijosae this is great, it may save me as I need a rail splitter that can supply 40-50mA and TLE2426 is spec'd at only 20mA. Normally I use a buffer but the one I had in mind works only to 12V and I need 24V. Output impedance might be a bit high though with those 10 Ohm resistors. How about reducing them? |
| sijosae HeadWizer Joined: N/A | Message [#11] posted on: 10-22-2003 07:53 AM CST (US). | | aos, upper schematic is oriented to battery use. (i.e. lower power consumption) As you supposed, reducing output resistors and using higher hFE transistors would be much better. Anyway, this is the size comparison of SMD-version, TO-92 version, and DIP-8 type TLE2426. PCB size of the TO-92 version is 10x7.5mm. I like this TO-92 version. [Edited by sijosae on 10-22-2003 at 11:17 PM.] |
| Budgie Member Joined: Feb. 11, 2009 | Message [#12] posted on: 10-25-2003 01:49 PM CST (US). | | Your solder joints and layout are beautiful! Like fine art. |
| Gariver Member Joined: N/A | Message [#13] posted on: 10-25-2003 05:42 PM CST (US). | | Sijosae that's very nice work! The photos look very sharp too! Goldbond... OK. The tricky part is that the number of holes per strip is part of the Digikey part number. With that number, a Digikey employee cuts the strip to the number of holes you need. Get it? It is easy to screw up, believe me. Another way of learning to use the right IC Socket Strips is to get a Mill-Max catalog. It sure helps! Well, at least it helped me. You can get one at the link below. Good luck to you! [Edited by Gariver on 10-25-2003 at 10:49 PM.] |
| Gariver Member Joined: N/A | Message [#14] posted on: 10-25-2003 06:05 PM CST (US). | | Budgie, I really liked your comment: "Like fine art." It sure is like fine art. Well, it just so happens that Sijosae is an artist also. The drawing he did of Dr Zhivago is 1st class, very professional. It is very detailed and realistic drawing, not abstract. |
| goldbond Member Joined: Aug. 1, 2003 | Message [#15] posted on: 10-27-2003 01:10 PM CST (US). | | Thanks to all that replied for my query. I think I found what I need at Mouser, which I prefer to order from. (they're just a 4 hour drive from where I live, so shipping is dirt cheap and the parts get there in 2 days.) The part link is here - |
| huangyong Member Joined: N/A | Message [#16] posted on: 11-04-2003 11:05 PM CST (US). | | Can replace the transistors with FETs???? |
| arie Member Joined: N/A | Message [#17] posted on: 12-18-2003 09:38 PM CST (US). | | Sijosae, I built one of your rail splitters and it works great! Something I noticed though is that the TO-92 transistors I'm using are getting a little hot. They seem to stablize at an almost too hot to touch but no more and I've run the amp for over an hour now. I'm only using 9 volts and I was wondering if this is normal behavior for the circuit or if something is wrong. |
| sijosae Member Joined: N/A | Message [#18] posted on: 12-19-2003 01:38 AM CST (US). | | arie, I think something wrong. However I don't know what is problem. IMO, you should check the diode polarity. If above schematic was used, almost no heat in any components. |
| arie Member Joined: N/A | Message [#19] posted on: 12-19-2003 06:59 AM CST (US). | | I think I found the problem, and it does have to do with the diodes. Although their polarity is correct, they are not connected to anything else but themselves. It pays do double check all of the component connections. :) |
| fwh1599 Member Joined: N/A | Message [#20] posted on: 12-19-2003 08:42 AM CST (US). | | Good idea. I can't see your SCH(pic)? |
| sijosae Member Joined: N/A | Message [#21] posted on: 12-19-2003 09:40 AM CST (US). | | fwh1599, I am sorry for confusing you. "above schematic" means this; [Edited by sijosae on 12-19-2003 at 09:41 AM.] |
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