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Old 20th February 2013, 12:05 AM   #81
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More updated photos. The SMD's take soooo long to install. I much prefer THD's instead. It's looking much more like an oscillator now. I had to order some more parts so that will take a while to get here.
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Old 2nd March 2013, 11:32 PM   #82
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Has anyone had trouble identifying pin 1 on the HEF4051BT MUX/DEMUX chips? I got the data sheet from NXP Semi, but the markings they show are not on these chips. They are 16SOIC package. I did the best I could at guessing, but if someone has a positive way to identify pin 1, please share!
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Old 3rd March 2013, 06:10 PM   #83
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Hi dirkwright,

In this case the printed white bar should be a safe indicator. One side above pins is slightly beveled (hardly noticeable on this particular chip).

Finding pin 1: Basics: Finding pin 1 | Evil Mad Scientist Laboratories
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Old 3rd March 2013, 10:25 PM   #84
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Hi Anders, This is what I'm dealing with. The NXP chips have no dot, no bar, no dent, no nothing. I had to guess based on the text on the chip and it looks like I guess right. Thanks for the link! much appreciated! (I can check to see if there's a beveled edge on one side, but I didn't notice one. The data sheet is completely wrong!)

Dirk
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Old 3rd March 2013, 10:50 PM   #85
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Hi Dirk,

Ah, you have a different 4051 chip than I have. I was certain that I had the same as you, clearly not so.

Well, I friend also built this generator and I checked with him just recently and apparently he has the same NXP chip as you have. According to him, there is a beveled edge (barely visible).
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Old 3rd March 2013, 10:56 PM   #86
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OK, great. thank you so much Anders! I have more questions also about this board. There are some more things I don't understand yet. I'll get back to this later.
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Old 7th March 2013, 10:37 PM   #87
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OK, I have everything wired up, and when I powered it up, I got no output. The relays click, the power supplies are doing their thing, and nothing is getting hot on the board. Is there something I'm supposed to adjust to get it to oscillate? I was thinking of RV9 or something.
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Old 8th March 2013, 06:10 AM   #88
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Hi Dirk,

I did not find any of the adjustments to be critical for oscillator operation. As usual, triple check everything (I bet you already have).
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Old 8th March 2013, 12:53 PM   #89
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Quote:
Originally Posted by AKN View Post
Hi Dirk,

I did not find any of the adjustments to be critical for oscillator operation. As usual, triple check everything (I bet you already have).
I just checked it again this morning and I got nothing. I twiddled pots and that didn't make a difference. I went over the whole board with a magnifying glass and can't see where I made a mistake. All the opamps and other chips are installed correctly and have appropriate power. Unless one of them is bad (which I think is unlikely), then I'm stumped.
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Old 8th March 2013, 07:48 PM   #90
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Hmm, no oscillation and everything in a fixed state if I get it right.
Have you checked the input/output potential at every op-amp? If (-) > (+) then output low and vice verse.
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