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| Need some help identifying oscillator pinout |
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| shawty:
Apologies if there's a better forum thread for this, please move it if there is. While clearing out some old boxes of electronics I found some very old oscilator circuits, the all in one can veriety that you hook up to power and they provide a square wave on one of the pins. I can see from the markings on top that one is 8mhz the other is 16mhz, and they are at least 4 times the size the more modern ones are, they are also considerably hevier. They have 5 pins on the bottom, I've tried hooking them up same way I do the newer 4 pin veriety, but getting nothing out of them on the scope. Scope is set up all ok, as it's giving me a trace on the newer ones I'm using for reference. Bing/Google.... absolutely useless (As sadly is usually the case these days), well unless I want to buy a clock.... Anyway here are some photos of the devices, if anyone knows the pinout, or even has a data sheet I love to see them. https://imgur.com/a/WNIGFHu I don't know why the individual imgur image links are not showing, but if you click on the anchor link that is showing above this line, it'll take you to the full page on imgur where I posted them all. Many thanks Shawty |
| CountChocula:
I think these are temperature-compensated oscillators. It looks like the 16MhZ one is voltage-controlled as well; not sure about the 8MHz one. In addition to a supply and ground, it also needs a control voltage that can be used to trimmed the exact oscillation frequency. I think that the pinout is as follows (but please don't blame me if you end up frying the component, I may be completely wrong!): 1 - Output 2 - GND (also connected to the can, so you can verify as a basic sanity check) 3 - Control voltage input 4 - Reference voltage 5 - VCC As I understand, you can use the reference voltage on these cans to program the control voltage pin using a pot. No idea what VCC might be… I would perhaps start around 5V and work my way up, as some of these things run at 12V. —CC |
| DimitriP:
--- Quote ---Bing/Google.... absolutely useless (As sadly is usually the case these days) --- End quote --- Bing AND google want you to take them apaaaht!!! And post pictures! |
| shawty:
--- Quote from: DimitriP on September 03, 2023, 10:46:44 pm --- --- Quote ---Bing/Google.... absolutely useless (As sadly is usually the case these days) --- End quote --- Bing AND google want you to take them apaaaht!!! And post pictures! --- End quote --- :-DD :-DD :-DD :-DD :-DD :-DD |
| shawty:
--- Quote from: CountChocula on September 03, 2023, 08:17:06 pm ---I think these are temperature-compensated oscillators. It looks like the 16MhZ one is voltage-controlled as well; not sure about the 8MHz one. In addition to a supply and ground, it also needs a control voltage that can be used to trimmed the exact oscillation frequency. I think that the pinout is as follows (but please don't blame me if you end up frying the component, I may be completely wrong!): 1 - Output 2 - GND (also connected to the can, so you can verify as a basic sanity check) 3 - Control voltage input 4 - Reference voltage 5 - VCC As I understand, you can use the reference voltage on these cans to program the control voltage pin using a pot. No idea what VCC might be… I would perhaps start around 5V and work my way up, as some of these things run at 12V. —CC --- End quote --- Thanks Count! Yea I was going to start at 5v, and in fact that's what I've been testing them with so far. My DC Bench can rock up to 30, so getting 12 not a problem. Never heard of a voltage trimmed oscillator before... seriously :-) I have a boxful of tiny 4 pin ones from 1 Mhz right up to 100 Mhz and they all have exactly the same pinout, even from different manufacturers, I'm used to just going clockwise from upper left -> Ground, Sig, VCC, NC It's somewhere to start investigating though, that's the main thing. The stuff you find when doing loft clearances is amazing! Cheers Shawty |
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