Here's a look at the first cut of the signal interface board for the X72. The board does not bring out the LEDs. You can pick those off the connector board. It can also be used with the SA22.c once a board that breaks out the SA22 connector pinouts to a 34 pin cable (8 pins are for the SA22.c +5V power/gnd) is built. Note the TO-220 LM7805 voltage regulator... Symmeticom does not deign to tell use mere peons how much current that needs. That regulator may need to be a switcher or need a heat sink. The BNC on the end of the board is configured to output the programmable ACMOS output, but with a cut and jumper can output the FXO output (the 60 MHz X72 oscillator output)

			Attila Kinali

On Sun, 20 Aug 2017 16:22:18 +0000 Mark Sims <holrum@hotmail.com> wrote: > It can also be used with the SA22.c once a board that breaks out the SA22 > connector pinouts to a 34 pin cable (8 pins are for the SA22.c +5V power/ > gnd) is built. Note the TO-220 LM7805 voltage regulator... Symmeticom does > not deign to tell use mere peons how much current that needs. That > regulator may need to be a switcher or need a heat sink. Isn't this the "max warm up power" in the "X71 Design Absolute Maximum Rating" table in the designer's refernence manual? Or am I missing something? It states that the X72 uses 17W max 10W for 25°C ambient. Which sounds about as much as I expect for an vapor cell standard. Though 3A on 5V (or 2A @25°C) is a bit tough. Attila Kinali -- You know, the very powerful and the very stupid have one thing in common. They don't alters their views to fit the facts, they alter the facts to fit the views, which can be uncomfortable if you happen to be one of the facts that needs altering. -- The Doctor