Search results

  1. M

    Help out a newbie just starting

    Hi, Don't ask questions -- just follow the advises already offered. if i were to be in you position ( abt me - a 61+ retired telecom engineer, still consider myself a dummy and want to learn a lot ) i would have finished a book or two by now. take any faulty board- afforda multimeter and a...
  2. M

    I like this...

    Hi Panannto, You are Welcome, i add a comment- this site for ever SERVES too it is for youngsters to use it to grow their knowledge and try become practical and purposefull All the best-- Sarma
  3. M

    ic query

    Hi, when you get a rectified dc, though varrying, the DC content is taken by the ic and the variation is treated as source or supply variation. still the control loop of the ic should give you a regulated o/p for obviously minimal load requirements.
  4. M

    ic query

    Hi, if it is fast varrying, try a votage doubler with germanium diodes like OA79, etc, the output can be clamped by three silicon diodes to fgive you around 3XVf of the diodes. this provided the variation is equal at MIN and MX. otherwiase try MAX1724. it is said of capable of working from...
  5. M

    Negative Reference Voltage

    Hi, In support of audio guru's opinion that you can work with one supply,  attaches find a application note URL http://www.national.com/an/AN/AN-1525.pdf this will enable you work with single voltage.
  6. M

    How I can convert (USB) to 12v?

    Hi please elaborate your point-- not able to catch it-- you mean deriiving 12v from usb power supply (5V0 for your use in the circuitry used by u.? if so you may use any Dc-Dc converter ( for eg., MC 34023A in the boost mode. with few extra components and convert it to 12v for your use. Is...
  7. M

    dual switching power supply question

    Hi the CC mode is preset for a known constant current-- hence no need to measure. if you are able to measure the total crt, you can deduct CC paramter and balance is taken by CV unit.
  8. M

    Doubling 7805 regulator current is effective?

    Hi Wuemura , Replace the D1 with 3 amp diode-- Go ahead-- try mount the transistors on the body of the poer supply cabinet ( if Metal) and insulate them with TO220 type packing kit. If plastic,  try a  heat sink of aluminum sheet of adequate thickness if you dont get the type suugested by...
  9. M

    Convert 0-30V 3A PSU to 5A or more

    Hi Audioguru, Current sensing outside cct Voltage sense-- yes. I shall come back  after a little study Fine sir regards Sarma
  10. M

    PC cdrom can auto play and auto repeat when just plug in the power supply

    Hi i have to check- may take some time
  11. M

    Doubling 7805 regulator current is effective?

    Hi Perhaps an LM323 can do your job but very costly compared to LM7805 In fact earlier MC78T05 (TO220) were available - I saw few of them -- these devices used to give 3 amps laod provided properly heatsunk. if you get hold you may try
  12. M

    Convert 0-30V 3A PSU to 5A or more

    Hi Audioguru i agree with you completely-- power projects , for that purpose any project soud be built with proper discipline-- i was only teeling about lead loss compensation from the power supply to the load point--( say 50 to 100 cm for each lead). this itself drops the voltage and the...
  13. M

    Convert 0-30V 3A PSU to 5A or more

    Hi audioguru you may recollect the type of power supplies that had two more wires(4 wire method) and the lead drop was taken care of and the voltage is corrected at the load-- i don't mean that we can then use thin wires and take the reisk of fire due to I^2*R loss . in specific case where...
  14. M

    Binary clock :)! Any one familiar with binary counters?

    Hi Bobleny Intead of asking whether someone is familiar with binary-- just think-- what heading you have designed-- i appeciate that you may perhaps be arning now-- coming to check-- i suugest that you try to breadboard it and have first hand experience-- or simulate on a softwaRE AND SEE...
  15. M

    Dead accurate 1Hz clock signal???

    Hi it is working with a single cell-- you need to level shift to TTL or CMOS in order that it is useful sarma
  16. M

    Dead accurate 1Hz clock signal???

    Hi, Lovely TOPIC. there are time signals broadcast  terestrially. like 10MHz, 15MHZ and many other. they provide time ticks at 1sce-- these are controlled by atomic clock . second , you should have DCXO- which provides a good standard clock and derive 1sec from this clock-- appears foolish is...
  17. M

    Counter

  18. M

    foam wire cutter

    Hi Steven, What a lovely homebrue construction. Really fine. Congrats for theefforts and you have even damaged your finger while making this, I fear!! Few doubt here,
  19. M

    PC cdrom can auto play and auto repeat when just plug in the power supply

    Hi CD drive can play and the output caN BE HEARD BY ANY AUDIO AMPLIFIER-- BUT AUTO REPAT -- DOUBTFUL--
  20. M

    What is this IC used for?

    Hi Vivek, this is a Pulse Width Modulation  SMPS chip. A good  device in deed. I suggest that you may see the datasheet from www.alldatasheet.com
Top