Search found 45 matches

by upsmaster
Sat Jul 17, 2004 7:43 am
Forum: General Discussion
Topic: Parallel Regulators
Replies: 13
Views: 2394

Re: Parallel Regulators

That's a lot of regulators and heat sinks. Full current specs of regulators include that they are heatsinked. Many manufactors have schematics of regulators useing series pass transistors to increase the regulators current capacity. less space less heatsinks and it will work correctly. joe
by upsmaster
Sat Jul 17, 2004 7:37 am
Forum: General Discussion
Topic: Reducing power surge on AC adapter
Replies: 8
Views: 2215

Re: Reducing power surge on AC adapter

I don't think u can, The inrush is so high that the DC to Ac inverter stalls and won't start. Some short time fix could be the tempture of where u are operating the inverter cold temps will cause your problem and too small of wire size on the DC input side of the inverter. Had this same problem with...
by upsmaster
Sun Jun 06, 2004 10:45 am
Forum: General Discussion
Topic: Small Fan with Flap?
Replies: 13
Views: 3417

Re: Small Fan with Flap?

How about the type of exhaust cap found on large trucks. Metal counter weighted flap valves good model to start with maybe.
joe
by upsmaster
Sat May 29, 2004 2:53 pm
Forum: General Discussion
Topic: green and blue track in protel
Replies: 1
Views: 986

Re: green and blue track in protel

Like AutoCad or Orcad different elements in a drawing are on different layers and are different colors. for P.C. layout they could be traces on the top side and a different color for the back side, or power supply lines positive and negitive ect,ect. Where they intersect could be a via where the con...
by upsmaster
Sun May 02, 2004 5:15 pm
Forum: General Discussion
Topic: Metal detecting
Replies: 20
Views: 5246

Re: Metal detecting

Some use magnetic seperators for this problem,or vibration or size weight differences.. the plastic parts fall on to a screen which they can not pass through but the metal will some times aided by vibrating the screen or the container that the material stream falls into ... or strong pm magnets that...
by upsmaster
Sun May 02, 2004 10:56 am
Forum: General Discussion
Topic: DC-AC converter
Replies: 31
Views: 8132

Re: DC-AC converter

design of even a small wattage inverter is not easy. Things u have to consider is transfer power,transformer loss, counter emf of transformer fields effect on switching transistors, bootstrap starting (inverter stall on start up only one side turns on and the other off in a static condition) If u ar...
by upsmaster
Thu Mar 25, 2004 7:45 pm
Forum: General Discussion
Topic: How a Power inverter works?
Replies: 9
Views: 2226

Re: How a Power inverter works?

not a simple as it sounds 12 volts d.c. to 120/240 a.c. is very poor conversion ratio for any high current designs. d.c. curent in is the same as current out a.c. less losses. 135 volt d.c. would be smaller for high current large inverters bigger than 5 or 600 watts use PWM control and IGBT transist...
by upsmaster
Thu Mar 25, 2004 7:26 pm
Forum: General Discussion
Topic: solar power questions
Replies: 13
Views: 2924

Re: solar power questions

diodes will drop the charge voltage by 1 volt 10.3 volts D.C. is a dead battery discharging any lower damages the battery float charge on a sealed lead acid battery is 13.6 volts nominal is 12.6 solar cells must prduce enough current to apply a higher voltage than the the open jar voltage 12.6 batte...
by upsmaster
Sun Mar 07, 2004 11:11 am
Forum: General Discussion
Topic: 1v to 5v output
Replies: 10
Views: 2490

Re: 1v to 5v output

what it sounds like you have a dancer contoller board which takes a 1-5 0-10 volts input from a variable reluctance transducer ( detects arm position on take-up reel in winding operation ..tape ,duct ,wire ,ect controls take-up speed as the build on the spool drum increases in size slows down the re...
by upsmaster
Tue Feb 24, 2004 5:34 pm
Forum: General Discussion
Topic: Automotive dual battery question
Replies: 29
Views: 6048

Re: Automotive dual battery question

the smaller cable only has have the current flow in it thus smaller cable to the other battery the larger wire carries all the current for the starter 700 amps
joe
by upsmaster
Sat Feb 21, 2004 5:11 pm
Forum: General Discussion
Topic: Amps or watts?
Replies: 13
Views: 2894

Re: Amps or watts?

crowbar you got it right.....but u can measure across the fuse while current is flowing through it this voltage drop times known current through fuse will tell you the loss in watts of the connections in this parallel arrangement and how balanced the current flow is and this number will probably var...
by upsmaster
Sat Feb 14, 2004 5:50 pm
Forum: General Discussion
Topic: Heating element
Replies: 4
Views: 1083

Re: Heating element

you are not shorting out the battery in that case.. the short resistance would need to be lower than the internal resistance of the battery...which can be .0003 ohms or there abouts it is very low.<p> joe
by upsmaster
Sat Jan 03, 2004 9:43 am
Forum: General Discussion
Topic: 12VDC to 110VAC
Replies: 8
Views: 2100

Re: 12VDC to 110VAC

if u use a inverter or a ups .. which is a batery charger + inverter + a switch to connect the load to the inverter or to the main power lines. the in rush will require at least 10 times load for the inverter to supply..inverters at low voltages on the dc side need lots of amps ( load = 20 amps tota...
by upsmaster
Sat Jan 03, 2004 9:31 am
Forum: General Discussion
Topic: 480VAC Transformer
Replies: 11
Views: 3229

Re: 480VAC Transformer

if u can find a neutral, 277 volts is doable. but to find the ratio u want may be hard to find..maybe using a regular trans former as auto former if u don't need isolation or can obtain isolation in a different section of the circuit u are going to use we use a multi tap xformer to get feedback for ...
by upsmaster
Mon Oct 20, 2003 6:20 pm
Forum: General Discussion
Topic: Strain Gauges
Replies: 6
Views: 2115

Re: Strain Gauges

some transducer manufactures can give u different outputs ex 0-30 mv 0-5 volts 0-10 volts and current loop 0-20 ma. their are several manuf of amp modules that allow u to get what ever output swing in a window of hi lo voltages. one trick i know of is that most transducer outputs are not always zero...