|
Post by gommer on Jan 4, 2011 15:20:19 GMT
Where can i find fecking affordable decent audio resistors. I started looking out for Dale RN55 1/8W. Found schuro.de but they ask almost €0.90 per piece Easy source farnell only has the HOLCO range in stock, also at €0.75. There should be decent resistors out there for around €0.10, but where, o where? All pointers welcome. Cheers, Marc
|
|
|
Post by PinkFloyd on Jan 4, 2011 15:49:20 GMT
|
|
|
Post by gommer on Jan 4, 2011 16:15:51 GMT
Cheers Mike.
I did visit Rapid, but apparently i've overlooked these.
Marc
|
|
|
Post by PinkFloyd on Jan 4, 2011 16:31:31 GMT
Tell me what you need, I'll order them for you and ship them over, will save you on postage Mike.
|
|
|
Post by gommer on Jan 4, 2011 16:43:58 GMT
Tell me what you need, I'll order them for you and ship them over, will save you on postage Mike. You're too kind, but don't bother. I'll be ordering a toroidal transformer too and shipping included, it's already cheaper than it would be @ Farnell.
|
|
|
Post by PinkFloyd on Jan 4, 2011 22:49:52 GMT
Tell me what you need, I'll order them for you and ship them over, will save you on postage Mike. You're too kind, but don't bother. I'll be ordering a toroidal transformer too and shipping included, it's already cheaper than it would be @ Farnell. Ok, no worries, glad to have been of assistance. The Vishay resistors are very good and exactly the same specs as the RC55Y... still expensive at 20 pence each but a lot cheaper than the other ones you were looking at Rapid also do the "Arcol" 1/4W 0.1% (15ppm) resistors and they are 49 pence each..... they don't have many values on offer though www.rapidonline.com/Electronic-Components/Resistors-Potentiometer/Metal-Film-Resistors/0.25W-0.1-MRA-Precision-metal-film-resistors/79896#techspec IMO, the Vishay ones are the better buy
|
|
jonclancy
Been here a while!
Mr. Ripple Eater
Amateur EAGLEist
Posts: 1,131
|
Post by jonclancy on Jan 5, 2011 16:29:51 GMT
How about MRS25? 0.6W in a 0.25W size. 50PPM, though. Half the Farnell price (miserable buggers apply quantity discount to each value now, not the whole resistor order!) at Rapid!
|
|
|
Post by gommer on Jan 5, 2011 17:08:28 GMT
How about MRS25? 0.6W in a 0.25W size. 50PPM, though. Half the Farnell price (miserable buggers apply quantity discount to each value now, not the whole resistor order!) at Rapid! Huh? Those can only be bought in packages of 100 pieces. Do i overlook something?
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jan 5, 2011 20:40:45 GMT
How about MRS25? 0.6W in a 0.25W size. 50PPM, though. Half the Farnell price (miserable buggers apply quantity discount to each value now, not the whole resistor order!) at Rapid! Huh? Those can only be bought in packages of 100 pieces. Do i overlook something? Can you REALLY hear the difference between those and the packs of 8 with copper leads that Jaycar sell for AU$.46C a pack, in a well designed,very low distortion SS amplifier using negative feedback ? The types that Mike refers to would be best reserved for areas such as LTP and Current mirror resistors etc. where very close matching is desired.
|
|
|
Post by PinkFloyd on Jan 5, 2011 20:41:16 GMT
How about MRS25? 0.6W in a 0.25W size. 50PPM, though. Half the Farnell price (miserable buggers apply quantity discount to each value now, not the whole resistor order!) at Rapid! Isn't the "beauty" of these the 15ppm temp coeff? If you're going for 50ppm you'd be as well using standard 1% metal films.
|
|
|
Post by PinkFloyd on Jan 5, 2011 20:42:24 GMT
Huh? Those can only be bought in packages of 100 pieces. Do i overlook something? Can you REALLY hear the difference between those and the packs of 8 with copper leads that Jaycar sell for AU$.46C a pack, in a well designed SS amplifier using negative feedback ? It's all about the temperature coefficiency Alex... 15ppm V 50ppm
|
|
|
Post by PinkFloyd on Jan 5, 2011 20:46:34 GMT
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jan 5, 2011 20:46:48 GMT
Can you REALLY hear the difference between those and the packs of 8 with copper leads that Jaycar sell for AU$.46C a pack, in a well designed SS amplifier using negative feedback ? It's all about the temperature coefficiency Alex... 15ppm V 50ppm Mike I was editing my post when you replied. Alex
|
|
|
Post by gommer on Jan 5, 2011 21:22:06 GMT
Actually, i'only need a few for the Panda, the rest is for my DAC in places where correct and stable tuning is important. In the panda i'll need them for the +6db in the feedback loop only. I had a complete collection of 0806 SMD but no TH components It's sorted, they've been ordered. Cheers, Marc
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jan 5, 2011 21:33:55 GMT
Marc I find it easier to buy packs of 8 at 46C a pack, and as I have a fairly high accuracy DMM, just select the matching values from the pack.Most 1% MF TH resistor packs that I have used recently are well within the +-1% tolerance. As far as DACs go, the resistors are more likely to have closer tolerance than the DAC output currents, and even areas like the PLL do not need better than that kind of tolerance, especially when associated timing capacitors are usually no better than +-5%. That is another reason why I use polyprops in that area, which are usually +-2%. We aren't talking instrumentation amplifiers here ! Regards Alex
|
|
|
Post by gommer on Jan 5, 2011 22:24:04 GMT
Even finding 1% metal film TH resistors is a pain these days. Local shops are disappearing and most European online shops are only stocking the exotic and expensive species.
About tuning the DAC: it sounds at it best with a specific bias voltage. I don't care if the current output is biased with a 1% I/V resistor, but 5% would be no go for me. And it can get hot with 24x 1543's, so temp stability is also an issue.
Cheers, Marc
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jan 5, 2011 22:30:18 GMT
Marc O.K. I take your point when used with that beast ! Alex
|
|