I've got 20 "MN3005"s here which I purchased from ebay and the seller is no longer registered which makes me think they're fake. I bought an aquaboy board to test these chips before before buying any dirtbag boards/parts and after building it up and trying to bias it it doesn't seem to work.
The clock trimmer and delay knob change the amount of high pitched noise as described in the build doc but the bias trimmer doesn't seem to make any difference.
Here's some pictures of my board:
(http://i43.tinypic.com/dvgfnd.jpg)
(http://i41.tinypic.com/t4za5x.jpg)
The only substitution I made was to use a 25k trimmer for bias instead of 22k. Is this my problem?
Another thing I've noticed is that my "MN3005" gets pretty hot after it's been connected to power for a little while (9V).
Anyone have any suggestions?
What direction did you put the jumpers?
Jacob
I'm sorry to say but that chip looks terribly fake, I could be wrong but... I don't think I am...
Is this the refurbished MN3005 from the seller with e-bay id "paul_freejazz"
Mine looks exactly the same, I have not tested mine yet...
Quote from: jkokura on December 29, 2011, 07:58:49 PM
What direction did you put the jumpers?
Jacob
Running along the length of the chips rather than across as shown in the doc for MN3005.
Quote from: Scruffie on December 29, 2011, 08:07:08 PM
I'm sorry to say but that chip looks terribly fake, I could be wrong but... I don't think I am...
Apparently they're pulls from karaoke machines and the tops where sanded and stamped because they looked untidy but I have a feeling you may be correct :(
I payed £80 for 10 and then when I tested them in my MN3008 DMM they didn't work so I emailed the seller and he sent me out another 10 without hesitating so I only payed for half of them but still £80 is a lot to spend on non working ICs even if I have 20 instead of 10.
Quote from: Loztboy on December 29, 2011, 08:09:44 PM
Is this the refurbished MN3005 from the seller with e-bay id "paul_freejazz"
Mine looks exactly the same, I have not tested mine yet...
Yeah it certainly is, let me know how you get on with testing yours. Hopefully we haven't been ripped off but the fact that he's no longer on ebay worries me.
Have you tried all your chips? Or just one?
Jacob
Only two so far, going to give the others a go tomorrow. I've checked over my parts and joints and it all seems okay to me. The main thing I think that could be wrong is the 25k bias trimmer.
That particular chip looks fake, I'm sorry to say.
If I pull one of the MN3008s from my deluxe memory man and drop it in will that be acceptable to test the board is all done properly or will I break something?
Did you check your voltages at the "mn3005"?
Did you check to see if you're getting an audio signal at pin 7?
I've had a fair share of genuine mn3005's in my hands and that one looks bogus. But you should be sure things are correct before subbing other bbd's.
Josh
Quote from: gtr2 on December 29, 2011, 11:20:52 PM
Did you check your voltages at the "mn3005"?
Did you check to see if you're getting an audio signal at pin 7?
I've had a fair share of genuine mn3005's in my hands and that one looks bogus. But you should be sure things are correct before subbing other bbd's.
Josh
I haven't checked the voltages. Will give that a go now. What voltages should I be looking for?
Will also check the signal at pin 7 and report back.
Cheers to everyone for the help :)
Edit:
Got audio at pin 7, louder than the input and the clock noise is present too which changes when i adjust the delay pot.
Voltages are as follows:
Pin1: 8.32
Pin2: 4.04
Pin3: 0.37
Pin4: 0.36
Pin5: 0
Pin6: 4.03
Pin7: 1.33
Pin8: 1.17
I got my last part for the dirtbag(chargepump) today, and wil test the mn3005's (same as you got) tonight.
Awesome, I have my fingers crossed for you :)
Mine does not work. I get a clean signal, but no delay. Tried audioprobing pin 3 still just a clean non delayed signal.
They get a little hot also.
I ordered two new ones from dalbani.co.uk (http://www.dalbani.co.uk/catalogue/product_details.php?id=20198)
I read some posts on FSB that they are real.
Hot = Bad
Sorry guys... looks like you got fakes, not even relabelled 3008s.
Damn, I'll go through all 20 of mine and see if I get any difference with any. How many did you buy Loztboy if you don't mind me asking?
EDIT: Just tested all 20 in aquaboy none of them give any delay and all get hot. Seems like I got fakes :(
I just got two.
I sent the seller paulfreejazz(at)gmail.com a mail asking for a full refund.
I'll see what happens.
SUX
I had a little hope since other ppl said the non refurbished ones was working...
Quote from: Loztboy on December 30, 2011, 08:25:08 PM
I just got two.
I sent the seller paulfreejazz(at)gmail.com a mail asking for a full refund.
I'll see what happens.
SUX
I had a little hope since other ppl said the non refurbished ones was working...
Think mine was from him and it's spot on, looks totally different to the one photographed.
Anything That's stated to be sanded for any reason makes me cautious...
I've asked for a refund, have to wait and see how it goes.
Man oh man. I just got my final parts in the mail, and I'm now pretty sure that my parts are fakes. Dang. I've built this thing for MN3005's, and I probably don't have any.
Jacob
Quote from: jkokura on December 30, 2011, 11:55:59 PM
Man oh man. I just got my final parts in the mail, and I'm now pretty sure that my parts are fakes. Dang. I've built this thing for MN3005's, and I probably don't have any.
Jacob
Small Bear Fake MN3005s? Half the Delay time but atleast it'll work.
Yeah, and not what I would prefer. Don't know Scruff. You got anything for me?
Jacob
I aint got any 3005s, the only one I ever had I sold for a repair job (regret that now as while i'm happy with 3008s, i'm about 150mS away from the delay amount i'd like! but atleast I fixed a DM-2).
I do suggest you just use 4 x 3008s, there's no reason not to really other than mojo, while a 3205 and 3005 might have differences a 3008 is just a 3005 with half the delay stages.
I'm currently writing a little guide to avoiding fake 3005s on this site and how to help spot a real one atlhough nothing is fool proof, these chips are quite clearly fake to me (I figure this kinda stuff is gunna keep happening, compiling it in a single thread will hopefully stop people buying off ebay or just stop buying 3005s altogether but I have a feeling that's a loosing battle).
I'm sorry but I don't have any secret source, if I knew how to get hold of 3005s reliably i'd have some for myself and also probably be very rich. The market is full of fakes, you are gunna have to keep investing in risks basically to have a chance of getting working ones.
And 4 x 3005s? I'm afraid you're dreaming, 1 is a possibility, 2 is damn lucky but can be done... more than that...
I got an answer from the seller regarding my refund request.
*****************
Pls apply to refund on paypal, I will refund full amount to you, I can't refund automatically at my side.
Best regards
*****************
How do I "apply to refund on paypal" anyone?
Go log in to your PayPal, find the transaction, open a dispute and then escalate it.
Jacob
I got my money back now!
Lets hope the ones I have ordered from dalbani.co.uk are real. :)
I went through paypal and made a claim and they haven't given my money back yet. I'll email him now and see what he says. Let me know how the dalbani ones go :)
I will as soon as I get them.
I e-mailed him in advance, and he told me they were original MATSUSHITA - PANASONIC ICS.
He even put up an updated product image:
http://www.dalbani.co.uk/catalogue/product_details.php?id=20198
as I said I heard good things about dalbani over at the FSB and http://electro-music.com/forum/post-293753.html
I put a MN3008 from my DMM into this aquaboy and I got delay out so it confirms the chips are fakes, at least my build works though :)
I got my MN3005's from dalbani.co.uk today and they are real. I posted a photo of them here: http://www.madbeanpedals.com/forum/index.php?topic=3137.msg31106#msg31106
I get about 510ms of delay with my dirtbag.