Recent content by 63Corvette

Dave, we didn't design this board. There's nowhere to take it back. This was designed in Japan 15 or more years ago - by a different company. Yes, I am under a non-disclosure agreement so I cannot show the entire board or schematic. I'd like to keep our customer and my job. What additional...

Okay, guys, I appreciate the help, but some of you are kind of rabid! This is the only schematic of this PCB, save the one locked up in Japan by the designer. And as I've said, the only thing not accurate about the schematic is the transistors weren't drawn to show the proper B, C, and E points...

Okay, so I think I might know what's going on. Who knows about OCXOs? That's what this is and the answer was there all along. I just didn't connect the dots. Someone here may have been able to point that out had I shared the entire schematic but I could not legally (or ethically) do that. I...

That would be Q13, not B13. One thing I saw missing on the schematic was pin 6 of the crystal going to gnd. The Q13 transistor C, B, E is drawn incorrectly, internally, however the actual traces are completely correct. You can verify that 9 of the 10 pins are connected to ground by simply...

I just figured this out. New to this forum :-) Here are a couple of pics. One of the PCB crystal area and one of the schematic.

Then tell me how these things have been working for 15+ years? Tell me how I'm reading 200MHz on my frequency counter from that single pin that isn't grounded like the rest? If you would, give me your email address. I will send you a picture of the board (w/o crystal) and schematic.

I have an obsolete, proprietary crystal oscillator. It is a 200MHz, 10 pin, SMT component. The number on the unit is 200N1. I cannot find another C.O. like it in size, number of pins or footprint. What I don't understand is 9 of the pins are grounded. Only one pin is used and it obviously puts...