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  1. schwarz

    Is CRCA steel good enough for Outdoor electronics applications?

    Thanks swall, what would be plating/galvanising recommendation? [ I am not from this background]
  2. schwarz

    Is CRCA steel good enough for Outdoor electronics applications?

    Hi, Normally we use aluminum cabinets for outdoor electronics enclosure. To reduce cost we propose use of CRCA steel. Please suggest if this is OK and what type of plating and painting are required to achieve 10yr+ life.Regards
  3. schwarz

    Has anyone had a serious look at this: Burning saline to generate heat

    Hi All, Interesting reading:Researchers at Purdue University have further developed a technology that could represent a pollution-free energy source. The technology produces hydrogen by adding water to an alloy of aluminum and gallium...
  4. schwarz

    Has anyone had a serious look at this: Burning saline to generate heat

    dcosta, nothing nuclear about it. Just to repeat tinfoil- "Seems ridiculous, but who knows?". I merely tried to say initially most discoveries are looked upon on with ridicule.
  5. schwarz

    Has anyone had a serious look at this: Burning saline to generate heat

    Hi, Einstein gave the equation e=mc2, that theoretically means that you can get huge energy out of small matter. As everyone here I am also skeptical, however did any one notice magic of falling Apple, or splashing water before Newton and Archmedes?
  6. schwarz

    Small generator sizing

    davidbeach: Our suppliers do not have such software.
  7. schwarz

    Small generator sizing

    Hi All, my query is not fully answered.The GENSET is meant to be standby duty, typical 8 hours a day. We normally program A/C to start late or early. Gensets we have specs like say for 15KVA GENSET- 15KVA continuous and 16.5KVA standby max.rating at 0.8 pf. This model has 19bhp @1500rpm engine...
  8. schwarz

    Small generator sizing

    Hi All, We often have to size Diesel genset for telecom sites. My questions are A) how much continuous(8-12 hours) KW load (0.9PF) & no A/C can be put on a 1 PHASE 10KVA DG set. B)If we have SMPS load of 7.5KW (0.9PF) and A/C load 2KW (0.6pf) what should be min. DG set capacity in KVA &KW? Regards
  9. schwarz

    Linking Spreadsheet Data

    Zip all needed files together with path info. This will ensure a 'good move'. br/
  10. schwarz

    Faster Excel Macro

    Hi Roger, I decided to give a hard look at this. I repeated your data in 20000 +rows in one worksheet, it takes about 2 seconds to organise with code given below. Have I overlooked anything? I am using excel 2000 . Application.ScreenUpdating = False l = Range("A65536").End(xlUp).Row For k = 2...
  11. schwarz

    HOW TO GET ORGANIZE ?

    gomirage, "I always try to prioritize but always find myself doing things not on my to-do list." Make a list of tasks on paper. Mark 'A' in red for highest priority immediate deadline tasks( max. 3). mark 'B' in yellow for high priority longer deadline (max. 3). Cross out everything else...
  12. schwarz

    Creating A Database And Using The Data For Project Quotes

    Shearstrength, For about 2500 parts I use a EXCEL sheet to store all master data with unique number ( item id ) for each part. For new costing or quote sheet I just need to enter item id in one cell and other cells which contain VLOOKUP formula get required details e.g. description, order...
  13. schwarz

    Communication skills

    I looked at the original post of ParabolicTet "good communication skills are much more valuable than technical knowledge" Communication skills are very important as one goes up the ladder, however good communicator is not necessarily technically weak. In fact if you are technically sound you...
  14. schwarz

    Efficient Tables

    Can you consideruse OFFSET(reference,rows, cols,height,width)function? GOOD LUCK.
  15. schwarz

    Control of DC Motor Driver - Help

    Hi, Hope that you have resolved all issues, please share the info with us. REgards.
  16. schwarz

    Efficient Analysis of Schematic Electronic Circuits

    Yes a well drafted schematic diagram makes life easier for everyone designer himself, testing , servicing - all. Many large organisations follow standards or create their own for docuentation including schematic diagram.If it is one of them you are lucky. method to analyse schematic circuits -...
  17. schwarz

    Control of DC Motor Driver - Help

    Thanks radarray, I am somewhat a learner in 'motors' area. "both output transistors from being turned on at the same time." is a common issue in our dc/dc converter and other bridge drive designs. I understand that when changing logic modes the driver should go through 'open' mode...
  18. schwarz

    Control of DC Motor Driver - Help

    "Motor is 12 V. RPM (freeload) is 5800, current 0.05 A. With Load, Speed is 5000 rpm, current 0.2 A." This translates into 12/0.05 = 240 Ohms at freeload and 12/0.2 = 60 Ohms Interestingly BA6219B lists R(L)=60 Ohms in test conditions.
  19. schwarz

    Control of DC Motor Driver - Help

    The o/p current max given in datasheet for BA6219B is for 500microsec pulse at 1% duty cycle.You will probably need high watt RES without chopped drive. I made a stepper motor ( Perm magnet ) drive long time back.It needed bulky current limiting resistors .The solution was to chop the drive at...
  20. schwarz

    Resistor Too Hot Solder Joint Melt

    Hi yanco , You were able to solve '7812 Get Hot / Vin Voltage Drop' yourself:-). I suppose this is the same circuit. W=I*I*R gives me 0.7 A at 5W across 10 Ohms; at 2.5W it is 0.5A What's current through 10 Ohms , it should be less than 0.5 A. Since 50 Ohms is also 'very hot' there is...

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