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Some LME49600 implementations - Page 11

post #151 of 288

Does Q3 have to be pre-biased or can I just use a MMBT3904?

post #152 of 288
Thread Starter 

Hi, Rodeodave.

 

I'm hoping someone who has had a prototype board will get back to me regarding any problems getting any of the fit-critical components such as jack sockets, switch or pot, before I do a respin. I have a limited number of these parts on hand, I don't want anybody left hung out to dry if they're having trouble getting them, and I want to keep my options open with regard to using different parts before I order the new boards.

 

I have another board I'm working on, I get a discount if I order both together, the turnaround is about 2 weeks, so it will be 3 weeks at least before I have respun boards. I'm sorry, I hope you'll be able to hang on 'till I get it done.

 

Avro_Arrow

 

I wrote the above before I saw your last post.

 

R20 is 47k. I had 1M in the original schematic, it didn't work out.

 

R17, R23, R25, R27 are 150R

 

R18, R24, R26, R28 are 1k5 These values give 13.75V rails. See the last paragraph of #147 for some comments on this.

 

That's the correct relay.

 

Yes, you can use MMBT3904, pre-biassed is not required. I tried to eliminate the anomalies in the BOM which arose as the result of drawing in haste due to my mind running ahead of my fingers, but evidently not with complete success.

 

w


Edited by wakibaki - 6/18/12 at 5:42pm
post #153 of 288

While I don't have time to research for convenient parts sources myself right now, I would really appreciate a DigiKey BOM.

 

Thanks,

Sebastian.

post #154 of 288

this is the audio jack I usually use, I'm pretty sure it will fit.

http://www.digikey.ca/product-search/en?lang=en&site=ca&KeyWords=sj1-3543&x=0&y=0

 

I have the BOM about 95% complete.

Digi-key does not have the alps pot...you will have to Mouser that.

post #155 of 288
post #156 of 288

L3 and L4 were a little tougher, not much information to x-reference from.

 

How about this?

http://www.digikey.ca/product-detail/en/28F0121-1SR-10/240-2436-1-ND/806796

 

Edit:

Changed my mind...this one:

http://www.digikey.ca/product-detail/en/HI3312X101R-10/240-2498-1-ND/810915


Edited by Avro_Arrow - 6/18/12 at 6:36pm
post #157 of 288
Thread Starter 

The dimensions are good, but the one I have is 78 ohms @ 1-25MHz, which was the lossiest at the lowest frequency I could find. They're there to assist in preventing spikes from the rectifier getting back onto the wire from the wallwart.

 

They could be superfluous, and they could be doing very little good. I just noticed that the O2 had some hum problems which were cured by a grounding wire. I suggested to the designer that this might indicate that there was some radiation from these wires, especially since he commented that the amp was audibly interfering with some other equipment when brought near, but he dismissed the suggestion, and anyway he had his fix as far as the amp itself was concerned. I haven't noticed any problems, so maybe they're working.

 

I'll see if I can find some lower frequency ones on Digikey.

 

w

 

I think the power and 3.5 jacks are OK.


Edited by wakibaki - 6/18/12 at 7:12pm
post #158 of 288

Preliminary Digi-Key BOM

There could be errors or omissions.

 

 

Digi-Key Part Number Manufacturer Manufacturer Part Number Customer Reference Quantity 1 Description
P10.0AACT-ND PANASONIC ELECTRONIC COMPONENTS (VA) ERJ-14NF10R0U   8 RES 10.0 OHM 1/2W 1% 1210 SMD
P150FCT-ND PANASONIC ELECTRONIC COMPONENTS (VA) ERJ-8ENF1500V   4 RES 150 OHM 1/4W 1% 1206 SMD
P1.00KFCT-ND PANASONIC ELECTRONIC COMPONENTS (VA) ERJ-8ENF1001V   13 RES 1.00K OHM 1/4W 1% 1206 SMD
P1.50KFCT-ND PANASONIC ELECTRONIC COMPONENTS (VA) ERJ-8ENF1501V   4 RES 1.50K OHM 1/4W 1% 1206 SMD
P4.70KFCT-ND PANASONIC ELECTRONIC COMPONENTS (VA) ERJ-8ENF4701V   4 RES 4.70K OHM 1/4W 1% 1206 SMD
P47.0KFCT-ND PANASONIC ELECTRONIC COMPONENTS (VA) ERJ-8ENF4702V   1 RES 47.0K OHM 1/4W 1% 1206 SMD
P100KFCT-ND PANASONIC ELECTRONIC COMPONENTS (VA) ERJ-8ENF1003V   4 RES 100K OHM 1/4W 1% 1206 SMD
P120KFCT-ND PANASONIC ELECTRONIC COMPONENTS (VA) ERJ-8ENF1203V   2 RES 120K OHM 1/4W 1% 1206 SMD
P390KFCT-ND PANASONIC ELECTRONIC COMPONENTS (VA) ERJ-8ENF3903V   3 RES 390K OHM 1/4W 1% 1206 SMD
P470FCT-ND PANASONIC ELECTRONIC COMPONENTS (VA) ERJ-8ENF4700V OPT. 2 RES 470 OHM 1/4W 1% 1206 SMD
399-1167-1-ND KEMET (VA) C0805C104K4RACTU   14 CAP CER 0.1UF 16V 10% X7R 0805
399-3525-1-ND KEMET (VA) C1206C106K4RACTU   8 CAP CER 10UF 16V 10% X7R 1206
399-1140-1-ND KEMET (VA) C0805C331K5RACTU   2 CAP CER 330PF 50V 10% X7R 0805
718-1525-1-ND VISHAY SPRAGUE (VA) TR3D476K025C0150   4 CAP TANT 47UF 25V 10% 2917
P12388-ND PANASONIC ELECTRONIC COMPONENTS EEU-FM1E471   7 CAP ALUM 470UF 25V 20% RADIAL
LM7805CT-ND FAIRCHILD SEMICONDUCTOR LM7805CT   1 IC REG 1A POS 5V TO-220
296-13869-5-ND TEXAS INSTRUMENTS LM317KCS   2 IC VOLT REG POS ADJ 3TERM TO-220
296-21577-5-ND TEXAS INSTRUMENTS LM337KCSE3   2 IC VOLT REG NEG 1.5A ADJ TO-220
LME49600TS-ND NATIONAL SEMICONDUCTOR LME49600TS/NOPB   2 IC AMP BUFFER AUD HI FI TO-263-5
296-17157-1-ND TEXAS INSTRUMENTS (VA) LM2901QDRQ1   1 IC QUAD DIFF COMPARATOR 14-SOIC
LME49990MA-5-ND NATIONAL SEMICONDUCTOR LME49990MA/NOPB   2 IC OP AUDIO LOW NOISE 8SOIC
LTC1150CS8#PBF-ND LINEAR TECHNOLOGY LTC1150CS8#PBF   2 IC OPAMP CHOP-STBL W/CAPS 8SOIC
ES1A-TPCT-ND MICRO COMMERCIAL CO (VA) ES1A-TP   3 DIODE FAST REC 1A 50V DO214AC
CP-058BH-ND CUI INC PJ-058BH   1 CON PWR JCK 2.5 X 5.7MM HIGH CUR
CP1-3543-ND CUI INC SJ1-3543   2 CONN JACK STEREO R/A 3PIN 3.5MM
CP1-3543N-ND CUI INC SJ1-3543N ALTERNATE 2 CONN JACK STEREO R/A 3PIN 3.5MM
CP3-1001-ND CUI INC PP3-002B MATE FOR POWER JACK 1 CONN 2.5MM FEMALE PLUG 5.5MM OUT
PB1061CT-ND TE CONNECTIVITY POTTER & BRUMFIELD (VA) IM03GR   1 RELAY TELECOM DPDT 2A 5V
450-1594-ND TE CONNECTIVITY ALCOSWITCH MSS4200R04   1 SWITCH SLIDE 2POS 0.276"BLCK T/H
post #159 of 288

Missing:

 

Q3

 

L3/4

 

J1/2

 

Case and Knob are builders discretion.

 

Volume pot on Mouser:

http://ca.mouser.com/ProductDetail/ALPS/RK09712200MY/?qs=fQ8kcZGzY5WCdIeX8tuPzA%3d%3d

post #160 of 288

Thanks for all the work A_A. If anyone has a link to a suitable case with PCB rails that would be nice since there are no mounting holes on the proto board. I have been unsuccessful looking through Mouser.

post #161 of 288
Thread Starter 

Brilliant!

 

Q3 is any general purpose SOT23 NPN transistor

 

L3/4 can be shorted, put a ferrite on the wire from the wallwart, close to the amp.

 

J1/2 are 2-pin headers (for jumpers), or run wires to a DPST switch.

 

Volume pot looks good with 15mm shaft, I had to take a diamond cutting disk to mine.

 

US supplier for box:-http://www.alliedelec.com/search/searchresults.aspx?dsNav=Ntk:Primary|B2%2f-080SI|3|,Ny:True,Ro:0&dsDimensionSearch=D:B2%2f-080SI,Dxm:All,Dxp:3&SearchType=0

 

UK (Farnell):- http://uk.farnell.com/multicomp/mcrebs80/case-aluminium-80x108-5x30mm/dp/1549967

 

w


Edited by wakibaki - 6/19/12 at 2:55pm
post #162 of 288

I have everything I need now to start building...except for the toaster oven.

 

Actually, I have a toaster oven, but we are still using it. My wife wants to buy

a new one but does not have it picked out yet.

post #163 of 288

I'm placing my order tomorrow.  Not sure if I'm going to go the oven route or the solder iron.  I have an old oven that I use for hardening paint.
 

post #164 of 288
wakibaki - I'd love a couple of boards if/when there are any available. Cheers!
post #165 of 288
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