I open this thread for those with PD boards in search of parts. I'm beginning the search now and see some economy in larger purchases at a better break point.
As an example, I'd rather spend $0.31 for a 3W resistor (x48) than buy them at $0.48 each.
So, express your needs, discuss particular selections, provide alternate sources, make an offer for participation...match some mosfets?
Here's the link to the Aleph 30 wiki:
http://www.diyaudio.com/wiki/index.php?page=Aleph-30
As an example, I'd rather spend $0.31 for a 3W resistor (x48) than buy them at $0.48 each.
So, express your needs, discuss particular selections, provide alternate sources, make an offer for participation...match some mosfets?
Here's the link to the Aleph 30 wiki:
http://www.diyaudio.com/wiki/index.php?page=Aleph-30
Mongo nice boy.
I need at least 100 of the 0.47 Panasonics, and 100 of the 1 Ohm 3-watters.
And some other goodies from DtheK such as Panasonic coils and an AN8008 that i just can't find overhere for P-D's TDA1543 NOS dac.
Just about ready with the entire list to send to the DK master but getting it sent overhere in the usual flatpack envelope can save me from import tax, 19% sales tax, BS tax, and the risk of eating a custums person.
I need at least 100 of the 0.47 Panasonics, and 100 of the 1 Ohm 3-watters.
And some other goodies from DtheK such as Panasonic coils and an AN8008 that i just can't find overhere for P-D's TDA1543 NOS dac.
Just about ready with the entire list to send to the DK master but getting it sent overhere in the usual flatpack envelope can save me from import tax, 19% sales tax, BS tax, and the risk of eating a custums person.
Regarding the miniature resistors, you also get them from www.farnell.com! However I think a group buy won't give so much better prices, since they have up to 100pcs the same price.
Have fun! Hannes
Have fun! Hannes
Panasonic also makes mini resistors that will fit nicely. They have better specs (TCR and noise) and (I think) a better sound (no sound). DK stocks them as well.
Datasheet: http://www.panasonic.com/industrial/components/pdf/AOA0000CE14.pdf
the parts search...
has produced some fruit. I looked through several surplus sites for bargains. I'll tend to limit my search to passive devices. When I consider the unknown qualities of electrolytics I feel better to purchase them from the shelves of a larger stocking distributor. The price difference (potential savings) has a bearing on this.
Let me insert here that I realized this post may be in the wrong place. If the moderators determine the discussion here becomes more appropriate in another location, so be it.
So this leaves me considering surplus sources for silver mica, 10 nF caps, power resistors and maybe some of the smaller board resistors. I'll want to get the mosfets matched. So here's what I've found:
Tech DIY (NJ, USA) http://tech-diy.com/hexfets.htm You will find very appealing prices for matched triplets of IRFP240's.
From Tarasque http://www.diyaudio.com/forums/member.php?s=&action=mailform&userid=4440 They are available while supplies last on the "continent". There have been favorable comments shared about the tight matches he provides.
I've wandered through ebay.
From trendcomp http://cgi6.ebay.com/ws/eBayISAPI.d...&ssPageName=ADME:B:FSEL:US:2&userid=trendcomp I've found 0.5r, 1%, 5W resistors. 50 for $4.19 including US shipping. I believe I'll get 100 to try out. I've also found the silver micas, 100 for $5.70. Those should last me awhile.
From bigsmythe74 http://stores.ebay.com/bigsmythe74?ssPageName=ADME:B:FSEL:US:3 I have found 221r RN55D (Dales) 50 pieces for $4.48 I note the lower rating and solicit feedback for their use, maybe set above the board a little.
I haven't found a surplus source for the transformer. The best I have found is johnango http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=270083864283&ssPageName=ADME:B:FSEL:US:1 who offers an 18+18 400VA torroid.
As always, your comments are welcome. Mongo doesn't know there are things he needs to know that he doesn't know.
has produced some fruit. I looked through several surplus sites for bargains. I'll tend to limit my search to passive devices. When I consider the unknown qualities of electrolytics I feel better to purchase them from the shelves of a larger stocking distributor. The price difference (potential savings) has a bearing on this.
Let me insert here that I realized this post may be in the wrong place. If the moderators determine the discussion here becomes more appropriate in another location, so be it.
So this leaves me considering surplus sources for silver mica, 10 nF caps, power resistors and maybe some of the smaller board resistors. I'll want to get the mosfets matched. So here's what I've found:
Tech DIY (NJ, USA) http://tech-diy.com/hexfets.htm You will find very appealing prices for matched triplets of IRFP240's.
From Tarasque http://www.diyaudio.com/forums/member.php?s=&action=mailform&userid=4440 They are available while supplies last on the "continent". There have been favorable comments shared about the tight matches he provides.
I've wandered through ebay.
From trendcomp http://cgi6.ebay.com/ws/eBayISAPI.d...&ssPageName=ADME:B:FSEL:US:2&userid=trendcomp I've found 0.5r, 1%, 5W resistors. 50 for $4.19 including US shipping. I believe I'll get 100 to try out. I've also found the silver micas, 100 for $5.70. Those should last me awhile.
From bigsmythe74 http://stores.ebay.com/bigsmythe74?ssPageName=ADME:B:FSEL:US:3 I have found 221r RN55D (Dales) 50 pieces for $4.48 I note the lower rating and solicit feedback for their use, maybe set above the board a little.
I haven't found a surplus source for the transformer. The best I have found is johnango http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=270083864283&ssPageName=ADME:B:FSEL:US:1 who offers an 18+18 400VA torroid.
As always, your comments are welcome. Mongo doesn't know there are things he needs to know that he doesn't know.
I have purchased from bigsmythe74 in the past, very good service (fast shipping). I got 0-ohm jumpers from her.
I will need to double check, but I believe I have a few hundred RN60 221R Dales that need a home. I'll go look again now.
[EDIT] So, I do have like 250 of them, but holding them up to my A30 boards, they are kinda ginormous. The RN55's from bigsmythe74 should be fine. They are rated at 1/8W, but I believe that's a mil-spec rating (1/4W real world). [/EDIT]
I will need to double check, but I believe I have a few hundred RN60 221R Dales that need a home. I'll go look again now.
[EDIT] So, I do have like 250 of them, but holding them up to my A30 boards, they are kinda ginormous. The RN55's from bigsmythe74 should be fine. They are rated at 1/8W, but I believe that's a mil-spec rating (1/4W real world). [/EDIT]
http://www.apexjr.com/miscellaneous.html#Transformers
Would the "Chia Yu Co Ltd, Input: 2 X 120Vac 50-60Hz 3" Dia X 1 1/2" Tall, Output 42Vct 21V- 0 - 21V" from Apex Jr work if 3 or 4 were used? I don't know the VA rating, but based on the dimensions, could someone make an educated guess or maybe even have experience using this $12.50 tranny?
Would the "Chia Yu Co Ltd, Input: 2 X 120Vac 50-60Hz 3" Dia X 1 1/2" Tall, Output 42Vct 21V- 0 - 21V" from Apex Jr work if 3 or 4 were used? I don't know the VA rating, but based on the dimensions, could someone make an educated guess or maybe even have experience using this $12.50 tranny?
I have 4 of those from ApexJr - I don't know what they're rated for either, but they are comparable (taller but narrower) to the 80VA plitron I just got. Even at 80VA, you'd need at least 2 for each channel and that would cost you about the same as a single 400VA from antek as Brian already mentioned.
Not to knock these tranformers though, I think they're great and I use one in a LM1875 p2p mini-gainclone, one for a pair of LM317 adjustable power supplies and I had 2 (tied 3 outputs in series) powering my BOSOZ (63+V) while I was waiting on the plitron.
Stephen
Not to knock these tranformers though, I think they're great and I use one in a LM1875 p2p mini-gainclone, one for a pair of LM317 adjustable power supplies and I had 2 (tied 3 outputs in series) powering my BOSOZ (63+V) while I was waiting on the plitron.
Stephen
Mike,
Welcome to the forum and I hope you enjoy building your Alephs. Let us know of any parts you have difficulty finding. Sourcing parts includes some bias on the part of the buyer. Mine tends to be done on the cheap...to make my mistakes without letting the smoke out of costly parts. Once the amp is making music I'll consider "voicing" it with select parts.
Taj,
You ask a question I'd like to know the answer to. I suspect increasing capacitance in resistors would affect (worsen) the linearity of frequency response.
Welcome to the forum and I hope you enjoy building your Alephs. Let us know of any parts you have difficulty finding. Sourcing parts includes some bias on the part of the buyer. Mine tends to be done on the cheap...to make my mistakes without letting the smoke out of costly parts. Once the amp is making music I'll consider "voicing" it with select parts.
Taj,
You ask a question I'd like to know the answer to. I suspect increasing capacitance in resistors would affect (worsen) the linearity of frequency response.
Mike, I downloaded Peter's BOM from here:
http://www.diyaudio.com/forums/attachment.php?s=&postid=858838&stamp=1141240430
I've used it to manage my way through the parts selection. I'd be glad to share it with you as I have "morphed" it. If you can receive an Excel file, drop me an e-mail and I'll send it to you.
With regard to the schematic, it is my understanding that Peter includes one along with his boards.
Todd,
Your question has led me to find some non-inductive resistors...why not? It will be a good a-b comparison for me.
http://www.diyaudio.com/forums/attachment.php?s=&postid=858838&stamp=1141240430
I've used it to manage my way through the parts selection. I'd be glad to share it with you as I have "morphed" it. If you can receive an Excel file, drop me an e-mail and I'll send it to you.
With regard to the schematic, it is my understanding that Peter includes one along with his boards.
Todd,
Your question has led me to find some non-inductive resistors...why not? It will be a good a-b comparison for me.
the other stuff
in no particular order, you will need other items to fashion a working amp.
heatsink...no, bigger...uh, AH...HEATSINK
can't be emphasized enough
power input module (switch, maybe includes a fuse block) like this:
Stroll through Apex Jr. and try to get to bed at your regular time http://www.apexjr.com/index.html
input jacks whether rca's or balanced input
speaker posts
power supply components: diodes or rectifier bridge, capacitors (no, BIGGER) did we include a fuse block?
wire to connect it all
Anything else? I know there's something else...
in no particular order, you will need other items to fashion a working amp.
heatsink...no, bigger...uh, AH...HEATSINK
can't be emphasized enough
power input module (switch, maybe includes a fuse block) like this:
Stroll through Apex Jr. and try to get to bed at your regular time
http://www.apexjr.com/index.htmlinput jacks whether rca's or balanced input
speaker posts
power supply components: diodes or rectifier bridge, capacitors (no, BIGGER) did we include a fuse block?
wire to connect it all
Anything else? I know there's something else...
Tosh said:
Those trannies make very good, COMPACT (the irony, a word that discribes small yet written large) LM3875 chip amps to give as gifts..
The cost of the LM3875 kits and those trannies are trivial compared to the appreciation that will follow from a friend who receives the gift of music, pasion and FUN!
Anatek sells some 400va trannies more appropriate for the A30..
Love me some Apex.jr stuff...
EDIT: Sorry I didn't see everyone else pointed to Antek also... Small world isn't it?
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.