Author Topic: Flange-O-Rama (Dead End FX Flange-A-Rama)  (Read 1101 times)

PMowdes2

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Re: Flange-O-Rama (Dead End FX Flange-A-Rama)
« Reply #15 on: February 25, 2019, 08:53:13 AM »
I'm glad you got it working in the end, it looks awesome, I hate it when people have trouble with our boards.  I have to admit I have a bunch of stuff that I need to go back to and tinker with.  Dino seems to just be able to nail all of our proto builds and I sadly have a bunch of stuff on the "calibrate later" pile.  Think I should just stick to Eagle.

Do you mind if I nab the pictures for our Instagram feed???

Thanks, I just ordered another one.  I have a feeling I'll need to build one for a friend once they hear it  :D  Sure, nab away.  If you need me to email you anything, that's fine too.

Received my PCBs yesterday. Placed an order for MN3204s with Utsource a moment ago - fingers crossed. Assuming they will arrive one day, is there any way to test the chips short of just trying them in a completed build?

I was wondering the same thing this morning.  Also, I'd be curious to know how to tell the difference between different op-amps.  I did notice that when I put the OPA2134 into the LFO, the triangle wave output had a larger amplitude than the TL072.  I'm not sure if that matters but that's why I chose it.

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rockola

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Re: Flange-O-Rama (Dead End FX Flange-A-Rama)
« Reply #16 on: March 14, 2019, 09:13:23 AM »
Here's what Utsource sent me. Do these look legit?


RDL68

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Re: Flange-O-Rama (Dead End FX Flange-A-Rama)
« Reply #17 on: March 14, 2019, 06:31:18 PM »
I can't comment on the 2 cans, but the chips all look OK (genuine) to me.

The MN3102's aren't so rare yet & it looks like they're NOS. Their pins don't look bent.

The MN3204's looks used, pins look bent to fit PCB pads or IC sockets. Hard to tell from pics if they've been de-soldered, but it doesn't mean you wont get working parts. Doesn't mean they'll all be working either, only testing them will answer that, but if you bought more than you need it'll help a lot in avoiding disappointment.

The MN3207's, I'd be more worried about the one on the left. Underneath looks like it may have been contaminated with something moist. It looks like the tide has come in from left to right. Not sure what's going on with that one.
You can check if it looks like that moisture reaches any of the pins where they come out of the IC & if so I'd be wary of that one, if moisture soaked inside it could've killed it. If that blemish is just on the bottom surface, it may be fine.