Yup. The old Ferrups line was an extremely robust and
forgiving UPS. Hated to see them disco'd. Emerson
messed up a few more also. :(
The present-day alternative is a true on-line backup
power system. A bit more expensive to implement.
Most have software-defined parameters, and can be
easily...
IMHO, both methods are a bit of overkill.
Granted, most of our work is in ducts or
otherwise enclosed in walls or ceilings,
but FO cable is pretty tough. Seems to
me that PVC conduit or EMT would be
more than enough protection and support
in a tray. Or possibly run the stuff
rated for direct...
I apologize if this is the wrong forum, but I did
not see anything else close.
I would like to resurrect an old steam cleaner that
someone has removed the pump feeding the coils, and
have no idea what to use. Near as I can tell from
browsing, the pump needs to be ~200 PSI * 3-4 GPM.
Is this...
A TVS would be fine, but pricey.
The 1N4007/resistor is the better option.
Use a flame-proof resistor. Don't cover it up.
Makes a great visual indicator. :)
We had a whole cabinet full of these (>200 pcs.)
and they worked fine.
<als>
How many three-phase loads?
If just one or two, the VFD options are simpler.
If the loads are variable or greater than 3 or 4,
then a rotary phase converter makes more sense.
Size it as large as the panel rating if the loads
are unknown. The one nice thing about converters
is that the more...
Yep. Problem here is that Dodge is controlling
the alternator field in the ECM, not with a
standard regulator. And there is not much room
left for an extra alternator in a pickup. :)
If it was not a diesel (with 2 paralleled batteries)
I would replace the alternator and run a tapped
24v...
Look at:
http://hmin.tripod.com/als/andysm/pages/analogs6.html
Scroll down to the bottom of the page, and pick out a
suitable circuit. Sub your derived voltage for the
feedback circuit in the diagram.
There are simpler ways, but I do not have handy examples.
<als>
Anyone have a good print for a 24-28v boost
converter? Application will be for a vehicular
auxiliary 24v system - probably 200 AH or so.
Need ~10-15A max. current for charging.
I'm thinking something similar to:
http://hmin.tripod.com/als/andysm/pages/sw-regs7.html#UPC71
with a bit more smoke...
Sort of related to something I am working on now.
Will post more recent efforts soon, but there are
some old reference drawings at:
http://hmin.tripod.com/als/fsmyth/pages/stepdrv3.html
<als>
There are a few example circuits at:
http://hmin.tripod.com/als/fsmyth/pages/555apps.html
Dig around. There might be something that matches
your application.
<als>
Check out:
http://dodgeram.org/tech/dsl/FAQ/turbo_faq.htm
About half-way down the page, it lists effects
and causes. High EGT is associated with a too-
rich mixture and mis-matched boost levels.
<als>
There is a ton of TL494 and 555 circuits at:
http://hmin.tripod.com/als/fsmyth/pages/timing.html
With careful selection of components, you can go to
0 Hz (i.e., off).
<als>
I have built fence chargers ages ago using an
ignition coil and a vibrator (some of you are
problably not old enough to remember those).
Worked reasonably well; the old ignition coils
output 10-15 kv. Newer coils will probably be
in the 50 kv range. I tinkered also with some
made from HV...
http://hmin.tripod.com/als/andysm/pages/sw-regs6.html#DWN62
Find the SO version of the 494; it is roughly the same size
as a SIP8 device. Adjust the 5.1k to pin 1 as necessary.
<als>
Here are some old 3-phase stepper drivers:
http://hmin.tripod.com/als/fsmyth/pages/stepdrv3.html
Somewhere, I have a more elaborate version of the
circuit already posted; let me know if you want it
and I will attempt to dig it up.
<als>
Just stumbled across a novel sawtooth generator, and
reposted it at:
http://hmin.tripod.com/als/fsmyth/pages/video-6.html#VID45
There is another here:
http://hmin.tripod.com/als/fsmyth/pages/timers3.html
I know I have some more, but have not had a chance to
add them to the site.
<als>
