DIY T-Amp user/diyer come here :), TA2024 complete build board diy
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 Oct 2 2008, 10:46 AM
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#721
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Senior Member
8,186 posts Joined: May 2005 From: Beaumont, Baile Ath Cliath, EIRE.   
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pretty good price!
 QUOTE(ongbs @ Oct 2 2008, 10:45 AM) aiya...I didn't know you get it from Farnell. My friend help me to source at RM2.50/pc for 63V version, I bought 4 pcs   |
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Oct 2 2008, 11:05 AM
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#722
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Senior Member
8,186 posts Joined: May 2005 From: Beaumont, Baile Ath Cliath, EIRE.
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oh really? an F-ERO?
 Can you confirm this?anyway, I have been reading about capacitors (as usual) especially on capacitor failures... The temperature and the working voltage(WV) greatly affect it. Since our WV is 12-14VDC and by getting a 63V caps will definitely extend it's life.. less voltage, less temperature rise.. There are other issues.. but as far as WV are concerned and size permitting, I'll go with the highest I can afford..  QUOTE(ongbs @ Oct 2 2008, 10:51 AM) but mine slightly smaller coz it is 63V version This post has been edited by jazzy939: Oct 2 2008, 11:06 AM hmm...different color too...not sure does it F-Ero huh?   |
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Oct 2 2008, 11:15 AM
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#723
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Senior Member
8,186 posts Joined: May 2005 From: Beaumont, Baile Ath Cliath, EIRE.
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bro ongbs,
great collection there including the now infamous golden coloured F-ELNA!  you're experimenting a lot ya with the input caps to tune your system! good work there  you should try the EPCOS. I tried and love it! my EPCOS input caps board will be used to drive the woofers in my bi-amp configuration. QUOTE(ongbs @ Oct 2 2008, 11:07 AM) Here are some input caps I gonna try out: |
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Oct 2 2008, 11:41 AM
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#724
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Senior Member
8,186 posts Joined: May 2005 From: Beaumont, Baile Ath Cliath, EIRE.
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Y.C.,
You don't? Anyway, I might be passing through JP later in the afternoon. After reading in details about capacitors, I want to do some experimenting.. Do you need anything from JP? (See, you do have a friend after all) You're right about the parking and fuel..  Yes.. EPCOS from farnell is pricey.. lucky I got mine 'free' from a DAC board... QUOTE(Y.C. @ Oct 2 2008, 11:31 AM) Ongbs, Good that you could get the caps from a friend; I do not have such a friend here in K.L.  For me, it's either Farnell or Jalan Pasar but do not expect to get decent grade parts from the shops at latter place, moreover the petrol and parking costs to go Jalan Pasar is not exactly cheap either! Jazzy, The price of Epcos 10uF caps at Farnell ranges from RM9.85 to RM17.01 each; see listing here: Epcos 10uF caps |
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Oct 2 2008, 12:02 PM
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#725
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Senior Member
8,186 posts Joined: May 2005 From: Beaumont, Baile Ath Cliath, EIRE.
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Y.C.,
Not at all. I will be on the way for Raya outing and happen to be passing through JP.. might as well take the opportunity lah! Also have been reading about capacitors and this is the summary of what I have found out. There are four classes of capacitors. The first class are low loss and good capacitance stability. The dielectrics in order from hi to lower is MICA,GLASS,some CERAMIC & LOW LOSS PLASTICS FILMS (polypropylene, polystrene). I know one shop is having a multilayer ceramic, I bought a few for my DIY pre-amp use and need more to try out on the T-amp..they're about 50 sen a pop.. (KIC) hence the need to drop by JP today QUOTE(Y.C. @ Oct 2 2008, 11:48 AM) Jazzy, You're really great; go JP to buy parts on second day of Raya. At present moment, I kinda don't need anything as yet; thank you so much for the offer. |
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Oct 2 2008, 01:40 PM
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#726
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Senior Member
8,186 posts Joined: May 2005 From: Beaumont, Baile Ath Cliath, EIRE.
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xtorm,
did passed through JP yesterday. some shops bizness as usual. I guess today more shops will be opened.. QUOTE(xtorm @ Oct 2 2008, 12:50 PM) wah jazzy, jp shop open today? ongbs, fast fast come out with reportlor...hehe Y.C. so the supply cap did give the effect of more power less details... hmm, i like my music instrument to be big, soundstage as well, so might get those 3300uf panasonic low esr |
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Oct 2 2008, 01:52 PM
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#727
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Senior Member
8,186 posts Joined: May 2005 From: Beaumont, Baile Ath Cliath, EIRE.
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oh really?
how much is this 'fine gold' would costs? oops never mind, found it! this one right? nichicon FG QUOTE(metalmania @ Oct 2 2008, 01:49 PM) Y.C is making fun of his own product... This post has been edited by jazzy939: Oct 2 2008, 01:56 PM by the way u guys know Nichicon Fine Gold is available at RS... |
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Oct 2 2008, 01:57 PM
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#728
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Senior Member
8,186 posts Joined: May 2005 From: Beaumont, Baile Ath Cliath, EIRE.
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thanks metalmania..
useable values there like 470uF and heyy, they have 2.2uF too! |
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Oct 2 2008, 02:01 PM
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#729
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Senior Member
8,186 posts Joined: May 2005 From: Beaumont, Baile Ath Cliath, EIRE.
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Y.C.,
JP have Panasonic caps? Really? NOT F-Panasonic no? QUOTE(Y.C. @ Oct 2 2008, 01:58 PM) Ongbs, The Y.C 2.2uF caps are very small, its size slightly smaller than size of (Panasonic 1000uF 16V), available in JP at RM0.70 each (if I did not remember wrongly); and then there are 2.2uF ones with size same as F-ELNA.  metalmania, Yes, I don't have much faith in the Y.C brand of caps. |
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Oct 2 2008, 02:08 PM
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#730
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Senior Member
8,186 posts Joined: May 2005 From: Beaumont, Baile Ath Cliath, EIRE.
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Anyway while we're at Nichicon FC, its aluminium electrolytic.
According to what I had read, aluminium (and tantalum) belong to the third class of capacitors, used for reliability and longer service life. Tantalum would be a better choice for millitary and harsh environment applications.. |
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Oct 2 2008, 03:28 PM
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#731
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Senior Member
8,186 posts Joined: May 2005 From: Beaumont, Baile Ath Cliath, EIRE.
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bro,
I am with you! QUOTE(ongbs @ Oct 2 2008, 03:17 PM) ....totally agreed That's why I bought so many types of caps...slow slow test and slow slow burn till I satisfy I will use what I hear is the best, don't care about its brand/material.....  |
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Oct 2 2008, 10:25 PM
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#732
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Senior Member
8,186 posts Joined: May 2005 From: Beaumont, Baile Ath Cliath, EIRE.
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whoa guys, thanx for the continuos updates..
sadly nothing from me.. did not even had the chance to go to JP as earlier planned. Had some guests over. metalmania did went to JP however and reported only one parts shop open Guess tomorrow or saturday will be a good day to drop by JP... Keep it coming guys.. |
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Oct 3 2008, 08:49 AM
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#733
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Senior Member
8,186 posts Joined: May 2005 From: Beaumont, Baile Ath Cliath, EIRE.
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morning guys!
ekool, thanx for the updates. looks like you have been doing some great experiments too... just like ongbs. Looks like this thread is slowly coming back .... hehe. btw, you're a 'night owl' too, huh? Y.C. My T-Amp also has been taking a break for the last three days..! I am itching to tryout a multilayered ceramic(MLC) for the input caps after reading about classes of capacitors...just curious on how an MLC would sound. BTW, anybody has tried polystrene capacitor? Y.C., That Vishay/ERO 2.2uF, would that be polystrene? I have forgotten what you said..  However the quantity of the MLC that I have right now is insufficient as it was meant for another project.. |
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Oct 3 2008, 10:16 AM
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#734
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Senior Member
8,186 posts Joined: May 2005 From: Beaumont, Baile Ath Cliath, EIRE.
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It would take alot of to burst a cap, my guess is that cap is a dud...
Thank God nothing happened to the T-Amp chip! Hey xtorm, what are you up to..? Anyway we're on page 98! two more pages to hit a 100! This post has been edited by jazzy939: Oct 3 2008, 10:17 AM |
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Oct 3 2008, 10:59 AM
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#735
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Senior Member
8,186 posts Joined: May 2005 From: Beaumont, Baile Ath Cliath, EIRE.
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Ah! Finally an update!
Moments ago I added a 470uF cap to the existing 220uF power caps making a total of 690uF. As I earlier suspected, after report from Y.C, I found the midrange/vocals have better presence. The sense of breathing is more natural and the highs are sharp and more lively... also had a better lower end extension. Gonna play with this config for a while... also I have a feeling that that F-ELNA caps after a long burn in is starting to get a wee bit too mellow/laid back to me... the additional 470uF caps somewhat restored the earlier sonics.. time to rethink about putting back the Vishay/ERO 2.2uF... hehe.. |
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Oct 3 2008, 02:47 PM
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#736
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Senior Member
8,186 posts Joined: May 2005 From: Beaumont, Baile Ath Cliath, EIRE.
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Y.C.,
Thanks.. I realized that you did THAT earlier somewhere.. I am just trying to compile a list of capacitor dielectric material and it's sonics on the T-Amp for my own use/reference.. currently at home nothing to do (yet). Thought of going to JP but it rained.. Yes, I am back to twiddling the T-Amp again.. It took so little time for the soldering iron to warm up (20 sec.) and few more seconds to plonk that 2 caps, hehehe..Anybody have come across MICA or GLASS capacitors? Thanks for the links Y.C.! ekool, are you alright? There are several SMPS out there that are made in China and even 'local' ones! NOT all Made In China products are bad.. you just got to be careful of what you're buying. SMPS wise I only will buy Mean Well. So far it has been 'behaving' very nicely.. I have bought another one actually.. but at a lower capacity of 1.2A. There are some adjustments to be made with regards to the output voltage but I could not imagine how a 12VDC SMPS giving an output of 18VDC! My conclusion would be the unit is FAULTY! QUOTE(Y.C. @ Oct 3 2008, 11:43 AM) Jazzy, I had mentioned in Post 1545 on page 78 that the Vishay/ERO MKT1813 2.2uF 63V caps are Polycarbonates (see also the web-page linked there). After goggling around more, the Vishay/ERO MKT1813 2.2uF 63V caps are found to be Metalised Polyester Film Axial Type Capacitors wrapped in either polyester or polycarbonate material. I would not be able to tell whether ours are polyester or polycarbonates. I further learned that for Vishay MKT series, M = Metalised, K = Plastic whereas T = Polyester. Do check out the 2 web-page on the Vishay/ERO MKT1813 2.2uF 63V caps below:- RS Components (product info) Vishay (product info) You also share my sentiment on using caps of relatively low capacitance value in the psu section? I have not tried out the 680uF or 800uF ones but at this moment feel that the overall sound balance from my T-amp using 470uF caps is much better than using 1000uF ones. And you are back to fiddling with your T-amp so soon? QUOTE(ekool @ Oct 3 2008, 01:36 PM) . i wonder why nobody mention whether i'm alright., hahaha btw, i found a smp rated 12v-15v. this is used for my old portable tv set that runs 12v. when measured this morning it gives 19.5v dc. made in prc. another friend bought a smp recently and similar thing happen. supposed to be 12vdc but when measured gives 17v/18vdc. bought in jp. so beware again and please measure your smp first before hooking up to the t amp if you bought any power supply from jp made in prc.  |
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Oct 3 2008, 04:16 PM
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#737
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Senior Member
8,186 posts Joined: May 2005 From: Beaumont, Baile Ath Cliath, EIRE.
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Thanks for the response bsl!
Yes, I did some 'googling' alright Was wondering the applications of these type of caps.. now I know! Did checked out RS.. you were right about thinning the wallet! Nahh wasn't thinking about using them on the T-Amp... it's on a pre-amp that I am working on... QUOTE(bsl555 @ Oct 3 2008, 03:37 PM) You can google mica capacitors for more info. They are in very small capacitance in picofarads and mostly used for tuned and critical circuits in RF frequencies. Its also best used in RIAA equalization circuits but sometimes its too big and the pitch width does not permit swaps. Last but not least, they're EXPENSIVE!.. you can check out RS or Farnell for prices. Can thin down your wallet easily. Forget using them in your T-amp. No SS power amp uses them anyway except in in one part of a tube amp. |
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Oct 3 2008, 04:18 PM
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#738
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Senior Member
8,186 posts Joined: May 2005 From: Beaumont, Baile Ath Cliath, EIRE.
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xtorm,
what are u saying? 1 uF as input cap? ok what about the 10uF? I have both values in hand right now... QUOTE(xtorm @ Oct 3 2008, 04:00 PM) ........... btw another thing you guys can try is 10uf cap with a 1uf as input cap, im runing active so it will not show any difference on mine, maybe bro jazzy try it out? supposingly the 1uf will aid with high over the 10uf...theorylah from newbie |
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Oct 3 2008, 05:08 PM
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#739
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Senior Member
8,186 posts Joined: May 2005 From: Beaumont, Baile Ath Cliath, EIRE.
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Thanks Blair for the info.
Yes.. 10uF is way too much for an input cap. I have one board with 10uF! Will be removing that soon to try something else.. xtorm, Looks like I am NOT doing to do that! |
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Oct 4 2008, 12:04 AM
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#740
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Senior Member
8,186 posts Joined: May 2005 From: Beaumont, Baile Ath Cliath, EIRE.
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I thought we've mentioned about the DC biased input of the T-Amp and the necessity of having the input caps awhile back. The only Class D amp that got rid of input caps and the output filtering is made by MAXIM which I also mentioned..
xtorm tried to get rid of the input caps, right? and have to make some modifications to the input circuitary of the amp, right? my question is, why do we need to get rid of the input caps? As far as I know, the presence of a capacitor at the input of an amplifier is mainly for DC blocking... and also for filtering (hi/lo band pass).. We learn something new everyday, right? |
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