Re: [time-nuts] Use the LT3042 for retrofit?

kb...@n1k.org said: [context is EFC control voltage] > Generally, the biggest factor is the voltage drop from the oven current > getting into the EFC “loop”. Its actually pretty hard to keep them > separate. Is there a fundamental problem, or is it just that everybody uses historical

Re: [time-nuts] ULN regulator with more current capability than LT3042?

Am 20.03.2018 um 10:09 schrieb Attila Kinali: Hoi Gerhard, On Sun, 18 Mar 2018 21:41:28 +0100 Gerhard Hoffmann wrote: Use the LT3042 with an external power transistor, such as D44VH10G: < https://www.flickr.com/photos/137684711@N07/29197476530/in/album-72157662535945536/

Re: [time-nuts] Use the LT3042 for retrofit?

Hi The gotcha is not on the manufacturing end. When you show up with a dual ground pin part, the OEM asks: Where do I tell the PCB layout guys to put the other ground? The answer always comes back to “there’s only one ground plane, they will both connect to the same plane.”. If you get past

Re: [time-nuts] ULN regulator with more current capability than LT3042?

> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of John > Ackermann N8UR > > Reviving the conversation about superb voltage regulators, I am looking > for one to run the analog and PLL bits of a high performance frequency > synthesizer chip. > > The current drain looks to be about

Re: [time-nuts] Use the LT3042 for retrofit?

Am 21.03.2018 um 23:03 schrieb Hal Murray: kb...@n1k.org said: [context is EFC control voltage] Generally, the biggest factor is the voltage drop from the oven current getting into the EFC “loop�. Its actually pretty hard to keep them separate. Is there a fundamental problem, or is it

Re: [time-nuts] Use the LT3042 for retrofit?

Hi You can either do the math … yuck …. or just try it. It turns out that with a “normal” sort of EFC sensitivity (< 1 ppm / V) on a “normal” frequency OCXO ( <30 MHz) , the voltage can have a bit of noise on it and the phase noise of the device will not suffer. Simply put - you can run it

[time-nuts] TS2100: From regular xtal to OCXO?

Fellow Clock-Tickers, I've got a pair of Symmetricom TS2100's, both of which have the basic TTL oscillator module for their reference oscillator. As other owners of these units are probably aware, the board is also laid out for a couple of different types of OCXO. I've got what I

Re: [time-nuts] ULN regulator with more current capability than LT3042?

Before adding complexity of parallel devices or external passing, why not just try the old parallel-resistor trick? If the load takes a certain minimum current under all conditions, provide less than that via a resistor from the raw source to the regulated output, likewise under all