Bob kb8tq writes:
> If you have not already spotted a Vref pin on the unit, your magic
> 8V pin may be the Vref for the EFC. It also could be “factory use only /
> do not connect “.
Thanks - I think I did spot such a pin: there's 5.3V suspicuously close
to the tuning input, and wiring a pot to i
What with telework, I'm doing more timenuts-ey stuff at home, and the
power supply conundrum has come up.
There's a plethora of interesting widgets scattered across my bench
requiring variously, 5V, 8V, 12V, and 15V.
I've got a box full of various fixed voltage supplies, mostly linear,
picke
If you are patient, you can find Sorensen/Xantrex/Ametek programmable power
supplies on eBay for reasonable prices. Some of them are linear, some
switching. High quality stuff. The XT series are linear bench supplies.
-Pete
> On May 1, 2020, at 11:51, jimlux wrote:
>
> What with telework, I'm
Jim, when it comes to "bench supplies" - knobs for voltage and meters -
most of the commonly available Chinese bench supplies in the under 3A-range
are linear with series regulator.
This unit (HY1803D) is typical and has a transformer (relay-selected
winding depending on the voltage setting) and a
Hi
Spend some time on eBay looking for Power Designs bench supplies.
They went out of business years ago so they are not a popular item.
Thus the price is usually pretty reasonable. I have never seen one that
was a switcher….
Bob
> On May 1, 2020, at 2:51 PM, jimlux wrote:
>
> What with tele
I love my R&S NGT20, I have several of them.
Reasonably clean, analog, uA741 technology, no switcher, knobs for
everything.
3 independent, unconnected outputs:
2* 0-20V@1A for op amps etc
1*0-6V@5A for the digital stuff
for example:
<
https://www.ebay.de/itm/Rohde-Schwarz-DC-Power-Supply-Str
Yes, Power Designs units are VERY good. Some (their precision models) are
insanely good. They have a cult following and can be a bit pricey these days.
There are lots of posts on eevblog.com about them. Dave did a video on one of
the precision units.
https://www.eevblog.com/forum/testgear/
Hi
You don’t have to get into the fancy versions to get a nice quiet supply.
One of the guys at Frequency Electronics (I forget who …) turned me
on to them back in the 1970’s. I have not seen any of them selling for the
sort of prices some other supplies seem to command …. Maybe I just
spend m
I'm an amateur electronics hobbyist who's still a newbie (especially to SMD),
so please forgive the basic question.
I recently acquired a FE-5680A that was failing to lock on frequency (pin 3
never went low). It will power up, sweep up and down, and finally settle to
fluctuate around 9.999
Hi
The only way to work out what you have is to find the data sheet on that part.
It *should* translate
between the manufacturer’s markings and the exact part number. That part number
will tell you as
much as can be known about the part. Some data sheets are a lot more complete
than others.
On 5/1/20 1:11 PM, Mark Sims wrote:
Yes, Power Designs units are VERY good. Some (their precision models) are
insanely good. They have a cult following and can be a bit pricey these days.
There are lots of posts on eevblog.com about them. Dave did a video on one of
the precision units.
h
On 5/1/20 12:07 PM, Tim Shoppa wrote:
Jim, when it comes to "bench supplies" - knobs for voltage and meters -
most of the commonly available Chinese bench supplies in the under 3A-range
are linear with series regulator.
This unit (HY1803D) is typical and has a transformer (relay-selected
winding
Hello, time Nutters--
I have been phase locking the freq counters in my HP 6-GHz VNA, Tektronix
spectrum analyzer and bench freq counter to the 10 MHz signal from
a Trimble Thunderbolt via a 4-port distribution box and long coax cables
to each of the instruments. This works well but is a pain in
I’d give a “thumbs up” for the Acopian supplies, too. I have several and they
get used regularly. I haven’t had one die on me yet (knocks on head)
Steve
WB0DBS
> On May 1, 2020, at 6:23 PM, jimlux wrote:
>
> On 5/1/20 12:07 PM, Tim Shoppa wrote:
>> Jim, when it comes to "bench supplies" - k
Where do you buy these ? Their web site was not too illuminating.
Tnx, Dick, W1KSZ
On Fri, May 1, 2020, 4:31 PM mp...@clanbaker.org
wrote:
> Hello, time Nutters--
>
> I have been phase locking the freq counters in my HP 6-GHz VNA, Tektronix
> spectrum analyzer and bench freq counter to the 10 M
On 5/1/20 5:00 PM, Richard Solomon wrote:
Where do you buy these ? Their web site was not too illuminating.
digikey and mouser carry a lot of SiTime parts, including eval boards.
Tnx, Dick, W1KSZ
On Fri, May 1, 2020, 4:31 PM mp...@clanbaker.org
wrote:
Hello, time Nutters--
I have been
Okay, I think I'm beginning to get it.
I reread some articles about ESR with fresh eyes and what you wrote makes
sense. Since I won't be ordering many of them, it looks like a safer bet to
purchase a 10%, 1.5 Ohm ESR capacitor (Kemet PN: T495B105K035ATE1K5, Mouser PN:
80-T495B105K35ATE1K5). I f
Been there, did a search on the part number and came up empty.
They did have a "Request Samples" button so I filled out the form. Let's
see what happens.
73, Dick, W1KSZ
On Fri, May 1, 2020, 5:40 PM jimlux wrote:
> On 5/1/20 5:00 PM, Richard Solomon wrote:
> > Where do you buy these ? Their we
Hi
If the idea is to run things standalone, a generic eBay OCXO would work
better than these devices. The OCXO would be more stable. It also should
be lower noise / better ADEV.
If the idea is to lock these up to the TBolt, it’s not at all clear what benefit
that would have.
Bob
> On May 1,
If it's a filter cap on the output of an LDO voltage regulator (at 1 uF it is
probably not) be aware that a lot of LDO regulators have problems with very low
ESR caps. Check the LDO data sheet for acceptable values.
___
time-nuts mailing list -- time-n
An update on this:
I emailed both Jackson and Brandywine for prices on both the Desktop Fury, in
Jackson's case, and the board versions from each of them.
The good news is that they both were responsive. The bad news is they are both
out of my price range. Jackson by about 3 dB. Brandywine
Looking at the datasheet it doesn't look like you'd win any ADEV
competitions with it but it's small and the DCTXCO version would be nice to
use the I2C interface and it says frequency control resolution as low as 5
ppt. It has uses I can see.
Bill
On Fri, May 1, 2020, 5:50 PM Richard Solomon w
Hi
I would guess that the vast majority of folks on the list and an even
larger percentage doing the FMT are buying their GPSDO’s on eBay.
Which ones they buy and how well the work is very much a “that depends
sort of thing”.
The crop of devices at low(er) prices changes every 3 to 5 years. Wh
Hi Bob,
According to the USPS tracking number I'll have a BG7TBL GPSDO on Monday :-)
I really wanted to "Buy American" but a 10 dB price difference is worth taking
the risk.
Wes
On 5/1/2020 7:29 PM, Bob kb8tq wrote:
Hi
I would guess that the vast majority of folks on the list and an even
l
Why not just get a Trimble T-Bolt ?
Lots of them are still around.
73, Dick, W1KSZ
On Fri, May 1, 2020 at 6:26 PM Wes wrote:
> An update on this:
>
> I emailed both Jackson and Brandywine for prices on both the Desktop Fury,
> in
> Jackson's case, and the board versions from each of them.
>
> T
Did you get a newer one with late 2019 at least on the front BG7TBL panel?
The one I got doesn't have the frequency offset bug and works really well.
It locks on multiple birds really quickly. For the money it's hard to
beat. I've been comparing it to my Thunderbolt E. It obviously doesn't
provi
In message <73bfcf33-8b29-38a6-d5a7-9192375d4...@earthlink.net>, jimlux writes:
>I suppose I can package a bunch of those up in a bigger box with banana
>jacks or binding posts.
Use power-pole connectors, they are cheap and *so* much better.
I'm using a couple of fused West Mountain Ra
Power supplies are indeed mostly commodity items, but absolutely
essential. I have a large collection of OEM open-frame units, in linear
and SMPS, and a small collection of commercial bench supplies, and some
home-made ones.
You can of course get a bunch of bench units and set them up for ever
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