The "Dummies' Guide to getting parts/assembling CarlosFM's chipamp" - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 10th March 2006, 06:39 AM   #1
diyAudio Member
 
Join Date: Jan 2006
Location: Wisconsin....what did you expect?
Send a message via AIM to Spasticteapot
Default The "Dummies' Guide to getting parts/assembling CarlosFM's chipamp"

Seeing as how finding all the necessary parts at Digikey is a pain in the kiester (and I'm not sure if I have the right ones, anyway), I figure I may as well post a list of decent parts usable for a CarlosFM LM3886 chipamp. Except for the gargantuan capacitors used in the PSU, everything's from Digikey.
A quick question or two, though: Can I replace any of the PSU caps with caps of higher values? (such as the 2x 10,000 uf caps with 1 20,000 uf cap, or the 4700 uf cap with a 6200 uf capacitor.) Also, what would be the disadvantage to using a premade bridge rectifier? (A 200v 8A bridge rectifier is $1.50 from the Electronics Goldmine.) Or could some cheaper diodes be used? (They're over 1$ each, or about 18$ for the 16 needed for a monoblock setup?)
Also, how much sound quality would be lost by using one PSU instead of two?

PSU board:
(From Digikey):
2 493-1116-ND CAP 4700UF 50V ELECT VR RADIAL 0 3.49000 $6.98
-These are the 4700uf caps.

5 BC2.2KW-2CT-ND RES 2.2K OHM METAL FILM 2W 5% 0 0.32000 $1.60
-These are the caps used to drain the capacitors, and are placed across the rails. 5 is the minimum order.

2 P1.0W-2BK-ND RES 1 OHM 2W 5% METAL OXIDE 0 0.28000 $0.56
-These are the 1 ohm resistors between the 4700uf caps and the 10,000 uf caps.

2 495-1617-ND CAP 0.1UF 275VAC EMI SUPPRESSN
0 0.29000 $0.58
-these are the 100nf caps used to bypass the 10,000 uf caps.

2 0.47W-2-ND RES .47 OHM 2W 5% METAL OXIDE 0 0.23000 $0.46
-These are the .47 ohm resistors used in the "snubber".

10 1395PH-ND CAP 1500PF 100V CERAMIC DISC Y5V 0 0.07700 $0.77
These are the 1.5nF caps used in the "snubber". (NOTE: Ceramics were chosen due to price, not because they're good. 10 are ordered due to minimum order requirements.)

8 RURP860-ND DIODE ULTRAFAST 600V 8A TO-220AC 0 1.11000 $8.88
These are the rectifier diodes. They look almost identical to the MUR860's CarlosFM reccomends.

From Ebay:
4x Nichicon 10,000 uf 50v caps: 10$. Somebody's selling 'em for less than half of Digikey's price.

Total: 30$, + ~4$ shipping for one PSU.
Hmmm....I wonder if the regulated PSU might make more sense? At 7$ for each regulator, they're a little bit pricier, but you don't have to bother with the 10,000 uf caps. Plus, it's regulated, which is likely a good thing.

Chipamp:
2 495-1172-ND CAP 2.2UF 100V METAL POLY 0 1.16000 $2.32
5 PPC15.0KXCT-ND RES 15.0K OHM METAL FILM .50W 1% 0 0.19400 $0.97
5 PPC330BCT-ND RES 330 OHM .50W 5% MF FUSIBLE 0.43400 $2.17
6 495-1147-ND CAP .10UF 100V METAL POLY 0 0.17000 $1.02
4 495-1135-ND CAP .0033UF 100V METAL POLY 0 0.17000 $0.68
2 338-1125-ND CAP 300PF 500V MICA CHIP 1812 1.93000 $3.86
5 PPC100BCT-ND RES 100 OHM .50W 5% MF FUSIBLE 0.43400 $2.17
5 PPC2.0KW-1CT-ND RES 2.0K OHM METAL FILM 1W 5% 0 0.34800 $1.74
4 LVRA-.10CT-ND RES .10 OHM 1% 1W METAL STRIP 1.26000 $5.04
2 LM3886TF-ND IC AMP AUDIO PWR HP 68W TO220-11 0 5.99000 $11.98
2 493-1112-ND CAP 2200UF 50V ELECT VR RADIAL 1.91000 $3.82

Total cost for chipamp: 36$.

Total grand cost, not incl. PSU: 56$. (60$ incl. veroboard.)
Not a bad deal, eh?

Now, here's the part y
  Reply With Quote
Old 11th March 2006, 11:43 PM   #2
diyAudio Member
 
Join Date: Jan 2006
Location: Wisconsin....what did you expect?
Send a message via AIM to Spasticteapot
The Regulated PSU:
2x 10,000 uf 50-60v capacitors from ApexJr, 1.50$ each. 3$ total.
NOTE:
These replace the 4700 uf caps in the original circut. I'm pretty sure they should work, though. (If not, feel free to correct me.)

Parts for Regulated PSU:
1 2 LM338T-ND IC REGULATOR ADJ 5A TO-220 0 2.50000 $5.00
2 8 RURP860-ND DIODE ULTRAFAST 600V 8A TO-220AC 0 1.11000 $8.88
3 5 BC2.2KW-2CT-ND RES 2.2K OHM METAL FILM 2W 5% 0 0.32000 $1.60
4 4 P5181-ND CAP 47UF 50V ALUM LYTIC RADIAL 0 0.25000 $1.00
5 5 BC91W-2CT-ND RES 91 OHM METAL FILM 2W 5% 0 0.32000 $1.60
6 2 495-1143-ND CAP .047UF 100V METAL POLY 0 0.17000 $0.34
7 5 PPC.47CCT-ND RES .47 OHM 1W 5% MF FUSIBLE 0 0.88600 $4.43
8 10 1N4003-E3/23CT-ND DIODE GP 1A 200V DO41 0 0.06900 $0.69
9 2 495-1161-ND CAP .47UF 100V METAL POLY 0 0.57000 $1.14
Total cost for single PSU:
25$.
This is pretty much Carlos Filipe's regulated PSU circut with bigger capacitors on the input.

Not a bad deal, eh? The LM338's should provide enough power for two gainclones. However, I'd prefer to use standard "bridge" rectifiers, as the diodes alone are nearly half the cost.
Attached Images
File Type: png snub_002.png (23.4 KB, 1145 views)
  Reply With Quote
Old 12th March 2006, 05:22 AM   #3
diyAudio Member
 
Join Date: Jan 2006
Location: Wisconsin....what did you expect?
Send a message via AIM to Spasticteapot
Transformers:
There's two inexpensive options for transformers at ApexJr. (By the way, the guy who runs it is very helpful.)

For non-regulated PSU:
2x Signal BL1752 transformers from ApexJr per PSU, at 8$ each. (36$ total for a monoblock setup.) These put out an impressive 7 amps at 24 volts AC on US line current, and have 3A 14v secondaries for a preamp. If you've got 220v house current, you can use the secondaries instead. (They're rated for 3 amps at 24 volts at 220v for the primary.)

For a regulated PSU:
2x Avel-Lindberg dual 28v output toroidial transformer, 150VA+
$22.00ea, 44$ total for a monoblock set.
These are nice transformers, but you'll likely end up needing to use two.

I do have a few questions, though:
1.
Will the 470nf "bypass" cap allow the 10,000 UF replacement for the 4700 uf capacitor work properly?
2.
Would the 800v/8 amp rectifier listed on ApexJR for $2.50 work in place of the MUR860's?
3. Would it be possible to modify the regulated psu to use the smaller transformer, and to have a smaller output voltage?
  Reply With Quote
Old 12th March 2006, 09:08 AM   #4
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
Join Date: Feb 2003
Location: Somerset, SW England
That's good work Mr Teapot! Now why not make up a nice web page with that information before it gets lost amongst the thousands of GC threads?
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  Reply With Quote
Old 12th March 2006, 10:49 PM   #5
diyAudio Member
 
Join Date: Jan 2006
Location: Maine
Correct me if I'm wrong...but that doesn't include a transformer, which is the most expensive part. Nevermind the petty things like fuse/fuse holder, power wire, volume pot etc.
__________________
Life is what you make it.
http://www.ssguitar.com
  Reply With Quote
Old 12th March 2006, 11:20 PM   #6
diyAudio Member
 
Join Date: Jan 2006
Location: Wisconsin....what did you expect?
Send a message via AIM to Spasticteapot
16$ for two of the above transformers, for a 336VA 24-0-24 combined power, should work just fine. ApexJR also has 100VA dual-winding 22v transformers for $17.50, two of which would make for a fine monoblock system if you want to use toroids.
Fuseholders are cheap at RadioShack. Also, this is designed as a "power" amplifer, for use with a preamp or iPod (or whatever.)
ApexJR has some inexpensive pots, though; they've also got some nice knobs.
  Reply With Quote
Old 13th March 2006, 01:35 AM   #7
diyAudio Member
 
Join Date: Jan 2006
Location: Wisconsin....what did you expect?
Send a message via AIM to Spasticteapot
Revised version of PSU/Chipamp parts lists!

I made a few mistakes, now corrected.
Here's the parts list for a proper Carlos Filipe gainclone.
(They're all muddled together, and unlabeled; I'll fix that soon.)
Index Quantity Part Number Description Customer Reference Backorder Quantity Unit Price
USD Extended Price
USD
1 5 BC2.2KW-2CT-ND RES 2.2K OHM METAL FILM 2W 5% 0 0.32000 $1.60
2 8 495-1617-ND CAP 0.1UF 275VAC EMI SUPPRESSN 0 0.29000 $2.32
3 2 0.47W-2-ND RES .47 OHM 2W 5% METAL OXIDE 0 0.23000 $0.46
4 10 495-1175-ND CAP .0015UF 250V METAL POLY 0 0.13300 $1.33
5 2 23J1R0E-ND RESISTOR WIREWOUND 1.0 OHM 3W 0 1.28000 $2.56
6 5 PPC15.0KXCT-ND RES 15.0K OHM METAL FILM .50W 1% 0 0.19400 $0.97
7 2 338-1125-ND CAP 300PF 500V MICA CHIP 1812 0 1.93000 $3.86
8 5 PPC100BCT-ND RES 100 OHM .50W 5% MF FUSIBLE 0 0.43400 $2.17
9 5 PPC2.0KW-1CT-ND RES 2.0K OHM METAL FILM 1W 5% 0 0.34800 $1.74
10 4 495-1135-ND CAP .0033UF 100V METAL POLY 0 0.17000 $0.68
11 4 493-1112-ND CAP 2200UF 50V ELECT VR RADIAL 0 1.91000 $7.64
12 2 495-1172-ND CAP 2.2UF 100V METAL POLY 0 1.16000 $2.32
13 2 495-1173-ND CAP 3.3UF 100V METAL POLY 0 1.61000 $3.22
14 5 PPC10KBCT-ND RES 10K OHM .50W 5% MF FUSIBLE 0 0.43400 $2.17
Subtotal $33.04

And, from ApexJR:
To order from Apexjr:
2x LM3886T's, 3.95 each. Also request insulators.
12,000uf 50V $1.29 x6
Signal BL1752 x2 7.95
IEC receptacle with 6 amp filter 2$
Gold plated RCA jacks A 2$
2x Dual binding posts B 2$
2x 600v 25A bridges from ApexJR
$42.50

Total cost, INCLUDING 330VA transformers:
75.54 + about 10$ shipping from ApexJr.
Transformers, jacks, and whatever are all included in this price; the only thing not included is an enclosure.
Pretty nice value for the money!

Also, if someone could host this info on a page, it would be dandy. I spent ages looking for a list like this when I first started.
  Reply With Quote
Old 13th March 2006, 10:09 AM   #8
Garnett is offline Garnett  United Kingdom
diyAudio Member
 
Join Date: Feb 2006
Location: London
Spasticteapot, I can stick it on my website, if you want. I've been trying to make sure everything gets properly attributed, so is it ok to post a link to your profile on here?

Also, if you can relabel them like you mention, that would be really useful. Thanks.
  Reply With Quote
Old 13th March 2006, 05:33 PM   #9
diyAudio Member
 
Join Date: Jan 2006
Location: Wisconsin....what did you expect?
Send a message via AIM to Spasticteapot
No problem!
I'll get right on it.
(thanks, by the way!)
Also, feel free to use my actual name (Joseph Shaul) on the page.
  Reply With Quote
Old 13th March 2006, 07:49 PM   #10
diyAudio Member
 
Join Date: Jan 2006
Location: Wisconsin....what did you expect?
Send a message via AIM to Spasticteapot
The now-annotated and corrected lists:

5 BC2.2KW-2CT-ND RES 2.2K OHM METAL FILM 2W 5% 0.32000/ $1.60 total
R1, R2 on PSU
These are the 2.2k “bleeder” resistors in the front of carlosFM's psu circuit.

8 495-1617-ND CAP 0.1UF 275VAC EMI SUPPRESSN 0.29000/$2.32 total
C7, C8 on PSU, CZ C3 and C5 on amplifier.
These are the 100nf capacitors (MKT polyester film) used on the amplifier and psu circuit. This is enough for 1 PSU, and 2 amplifers. 2 are needed per PSU, 3 per amplifier.

2 0.47W-2-ND RES .47 OHM 2W 5% METAL OXIDE 0.23000/$0.46 total
R5, R6 on PSU
These are the .47 ohm snubber resistors. They're metal oxide instead of metal film; however, from what I've read, this should'nt hurt quality much.

10 495-1175-ND CAP .0015UF 250V METAL POLY 0 0.13300/ $1.33 total
PSU C9, C10
These are the 1.5 nf caps used in the PSU snubber. 10 ordered due to minimum order restriction.

2 23J1R0E-ND RESISTOR WIREWOUND 1.0 OHM 3W 0 1.28000 /$2.56 total
R3, R4 on PSU
These are the 2 1 ohm resistors used in the PSU's “smoothing” section.

5 PPC15.0KXCT-ND RES 15.0K OHM METAL FILM .50W 1% 0.19400/ $0.97total
R1 on amp
These are the 15k resistors on the input to the circuit.


5 PPC100BCT-ND RES 100 OHM .50W 5% MF FUSIBLE 0.43400 /$2.17 total
R2 on amp
These are the 100 ohm resistors

5 PPC2.0KW-1CT-ND RES 2.0K OHM METAL FILM 1W 5% 0.34800 $1.74
R3 on amp
These are the 2k resistors in the circuit.

4 495-1135-ND CAP .0033UF 100V METAL POLY 0 0.17000 $0.68
These are the 3.3 NF snubber capacitors
C7, C8 on amp

2 495-1172-ND CAP 2.2UF 100V METAL POLY 0 1.16000 $2.32
C1 on amp
These are the input capacitors

2 495-1173-ND CAP 3.3UF 100V METAL POLY 0 1.61000 $3.22
C6 on amp
These are the 3.3 uf capacitors on the amp. (Feedback?)



5 PPC10KBCT-ND RES 10K OHM .50W 5% MF FUSIBLE 0 0.43400 $2.17
RM on amp.
I'm not quite sure what these do.

4 P10333-ND CAP 1000UF 50V ELECT FC RADIAL 0 1.75000 $7.00
C2, C4 on amp
These are the power capacitors on the amp.

2 338-1065-ND CAP 300PF 500V MICA RADIAL 0 2.00000 $4.00
Cs on amp
These are the 300pf capacitors on the amp.

5 BC2.7W-1CT-ND RES 2.7 OHM METAL FILM 1W 5% 0 0.16000 $0.80
Rz on amp
These are the Zobel network resistors.

4 LVRA-.10CT-ND RES .10 OHM 1% 1W METAL STRIP 0 1.26000 $5.04
R4, R5 on amp
These are the snubber resistors. They're metal oxide film by necessity; 1w metal film resistors cost 4$ each, and must be bought in groups of 10! I don't know what these will do to sound quality.

Subtotal: $38.48 + shipping.

To order from Apexjr:
2x LM3886T's, 3.95 each. Also request insulators; he'll likely give you some for free with a good-sized order.

10,000 uf 63v x8, 12$. (C3, C4, C5, C6 in PSU).
These are the big power capacitors.
Signal BL1752 x2 7.95
These are some inexpensive power transformers. (They also have some nice toroids; 2 of the $17.50 toroids at 100VA each should make for a nice monoblock setup.) 2 are needed; tie the center leads together for the ground to form a 24-0-24 transformer.

IEC receptacle with 6 amp filter 2$
This is a place to put in a power cable. It's also got a filter, for what it's worth.

Gold plated RCA jacks A 2$
Input!

2x Dual binding posts B 2$
Output!
Total from ApexJR:
42$

Not included from either location:
MUR680 diodes x8. Expect to pay 10$ for the lot.
These are the power diodes. Digikey no longer carries them; you'll have to find them somewhere else. Alternately, use a bridge rectifier.


Expected total cost:
100$, incl. shipping. Does not include case; I'd just find something interesting and broken (a toaster?) and use it instead.

Next up:
The parts for the BrianGT psu (much cheaper!) and Chill Amp amplifier.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Say Hello To "Sparky" the Parallel Chipamp lgreen Chip Amps 13 25th June 2006 04:58 PM
Carlosfm...Snubber Guide Lines? moray james Chip Amps 57 9th June 2005 02:43 PM
"Gold" chipamp set finished. steenoe Chip Amps 29 19th April 2005 09:06 AM
"Pentodes for Dummies" needed. Aud_Mot Tubes / Valves 3 28th March 2004 02:31 PM
Your ideal "ChipAmp", unlimited budget loong Chip Amps 23 13th February 2004 12:56 AM


New To Site? Need Help?

All times are GMT. The time now is 07:02 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2