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First post moderation. DaveD approved it. It's confused me too. The OXCO heaters pull over 200 mA when they turn on. The LM317 doesn't quite have the load stability to hold my desired voltage

Reg, sorry for the two close but quite the same comments. ?My browser indicated the first one had disappeared. ?Sound familiar?? S

Reg, yes, you’ve gone well down the rabbit hole….. ?I was wondering about the cap line-up you have planned. It seems to me you are trying to build a big battery to run the OCXO’s. ?My friend

Reg, yup you’ve gone way over the edge to the time/frequency nuts. ?While your filtering is impressive have you considered high frequency noise? ?When we do RF amps we put two or three 470uF

I just remembered that yahoo ate a project explanation that I'd spent 2 hrs writing. I walked away in disgust and forgot to address the gap. Supply is to feed 4 of the CTI OXCOs. Basic supply:

Hello, oh wow. I light up a cigar and grab some popcorn. Looks like this debate is about to get interesting. Tam With best regards Tam HANNA -- Enjoy electronics, 3D printing and cigars? Join

Dave, Home Run! "Personally rather than all the messing around testing 100s LM317s, I would have designed a power supply a voltage reference chip used in 6.5 digit multimeters - the LM399

[email protected]> wrote: I dont know exactly what you are doing , so maybe the 30 mV range is best, but the *worst* *range for 24 hour stability on the 3457A is its 30 mV range*. It’s more than

The LM317s arrived. Now I have to characterize them. The tabs are the outputs so I've ordered nylon threaded hex spacers to assist in mounting them. I have a nice 20 V 5 A linear lab supply to

As there seems to be significant misunderstanding of the problem I am addressing in this thread I shall elucidate: 1) Precise voltage doesn't matter. The tuning voltage will be varied constantly as

Mr. Kirkby, I sent you a private email and deleted your off topic posts from the archive. Asking why I didn't choose a different part with a bunch of smileys is off topic. You have brought the

If you need a PCB dude, chant a devils song to my personal email, not the list. I can fire up by IBF and whack something together. With best regards Tam HANNA -- Enjoy electronics, 3D printing

wrote: It’s not off-topic. There are very sound technical reasons for selecting used OXCOs and voltage In order to get best long term stability from an LTZ1000A voltage reference you need the PCB

A minor gloat. Color me amazed. I didn't think anyone would take the trouble to salvage 1.5 A LM317s. But ebay came to the rescue. I just ordered 110x *used* LM317s in the TO-220 package from CA via

The op amp I selected for the voltage follower for the LM399 is an AD8429BRZ. It will be challenging for an old guy with poor eyesight and no PCB CAD skills but I should have or be able to get a

I gutted an ancient CB radio PSU yesterday which served as my main 12 V PSU along with a 5 V supply I built from scratch many years when I was in school.? It's a 40 Vrms CT with 22 AWG leads.? It

I received a tinyPFA from R&L and am struggling to figure out how to use it. The documentation has a long way to go. I currently have a Bodnar 2 output GPSDO feeding the A input of my 5386A running

Grif, Thanks for your very interesting and insightful question. I've never thought about that, but it suggests an excellent experiment. The effective capacitance at a particular discharge rate

Not so much design as a hobby, but my noise floor really shrunk when I powered my station with a deep cycle battery. Wonder what the equivalent capacitance is on a group 24??? ;-) the switching

FYI I just ordered 4 from this seller: https://www.ebay.com/itm/115745541000 Which was about 1/4 of the other seller's prices. Makes them suspect, but Shenzen is truly the Wild West and Far