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

I have a quad LT3042 board somewhere. I should get around to measuring its output noise. Bruce > On 20 March 2018 at 03:11 John Ackermann N8UR wrote: > > > Thanks, all. I think I'll end up using the 3042 with pass transistor, > partly for reasons of cost. I have no idea

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

The details are on the LT3042 datasheet. A small series ballast resistor is used in series with each output and the Iref terminals are connected in parallel so only the offset of the unity gain output buffer is of significance. Bruce > > On 20 March 2018 at 02:23 Peter Vince

Re: [time-nuts] Looking for information on True Position GPSDO.

John - I would NOT bother with trying to replace the 10 MHz oscillator. Spend your $$ for the inexpensive Arduino board, LCD, 5 volt antenna, and nice enclosure that will provide you with a “self-running” GPSDO unit (operator intervention not required to operate). The fact that Mt. Airy

Re: [time-nuts] Looking for information on True Position GPSDO.

True Position was a Berwyn, PA mobile industry equipment provider. In 2014 they acquired Skyhook Wireless and changed company name to acquirer’s. — These True-Position units are surplus from the cellular/mobile phone industry. Several years ago, when these units first appeared (2010/2011), the Mt.

Re: [time-nuts] Quieting the HP-113AR Clock/Frequency Divider

Thank you for sharing your experience, Bill. I thought about building a wooden case and still might. My concern with the metal rack cabinet is that the metal panels can act as drumheads. In my 113, the 1KHz "singing" is much reduced once the motor is started. Whether it's drowned out by the motor

[time-nuts] Suggest time-and-tech related locations in Switzerland

Many thanks to everyone who provided suggestions regarding time-and-tech (and other) things to see in Switzerland! I am working through the suggestions. My wife (and mostly) I hope to pack in as many of them as possible. I also look forward to meeting any of you who plan to attend the

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

Thanks, all. I think I'll end up using the 3042 with pass transistor, partly for reasons of cost. I have no idea whether paralleling two 3042s would result in lower noise from the device, and there are already three or four fairly pricey chips on the board. I appreciate all the info! John

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

Please forgive this naive question, but I am concerned about the idea of simply running two regulators in parallel. Just like you don't put two batteries in parallel, how do you ensure accurate load balancing between the two? I would worry that one of them, with a fractionally higher voltage,

Re: [time-nuts] Quieting the HP-113AR Clock/Frequency Divider

Here's another experience with a 103 crystal standard with the requisite 100 KC output and a 113 clock. I craved the clock because I'd seen it in the Smithsonian precision time exhibit. The 103 was certainly quiet, but the 113 was not, in spite of its heavy cast aluminum case. The 1 KC stepping