Tips and Tricks


Some Tips and Tricks while designing a circuit

  1. capacitors1 (1)
  2. colour-coded-capacitor1
  3. easy-identification-of-resistor
  4. forward-voltage-drops-of-various-led
  5. led-series-resistor
  6. led-series-resistor
  7. low-cost-pilot-lamp
  8. nickel-cadmium-battery-charging (1)
  9. printed-circuit-board1
  10. rectifier-diode-characteristics
  11. resistor-color-code
  12. resistors2
  13. smoothing-capacitor
  14. soldering-techniques1
  15. tools-for-beginners1
  16. transistor-coding
  17. x-rated-ac-capacitors

8 responses to “Tips and Tricks

  1. I do not see my message. I hope this is not a duplicate message.

    If you please, I have a question. While I understand that the NiMH batteries have a “NOMINAL voltage” of 1.2 V….I also read in your article (and in other sources) that fully charged dry cells (e.g., AA ones) will read about 1.4 or 1.5…at least to start. I recently purchased a special Panasonic NiMH charger, which seemed like “a real winner.” Yet, I have found that the charger shuts off at about the 1.3 V level.
    What’s more, the insert with the charger listed 1.5 volts for both battery rating and charging voltage…and my multimeter shows that the charger is actualy operating at the 1.0 V level. I wonder if you could provide some clarification. I am mystified.
    As a matter of fact, I returned the unit (and a second one, as well!!), as it did not seem to be performing, and–at least for now–am using a conventional charger. Please what voltage should I be “looking at” for fully charged dry cells of this type?
    A gentleman–on a website–just criticized me…explaining that these should be charged about the same as NiCd cells (1.2 V)…and insisting that I was in error, but this issue seems to be more complicated than that…and the battery charger insert specs would seem to contradict the advice of the responder to my remarks. This is a real conondrum…and is kind’ve “driving me crazy!!” THANKS. ; )

    “Typical NiMH battery is rated 1.2 volts/cell. This is the nominal voltage of the cell that is discharging at the rate of C/10 at 25 degree centigrade to an end voltage of 1 volt. The battery pack has three 1.2 volt cells making a total 3.6 volts. When a fully charged battery is used, the discharge voltage starts from 1.5 volts followed by a sharp drop to 1.3 volts.” (Your words)
    “A fully charged cell supplies an average 1.25 V/cell during discharge, declining to about 1.0–1.1 V/cell (further discharge may cause permanent damage in the case of multi-cell packs, due to polarity reversal). Under a light load (0.5 ampere), the starting voltage of a freshly charged AA NiMH cell in good condition is about 1.4 volts.[20]” (Another source)

    • Dr. TCH, Thanks for your query. All rechargeable batteries rated 1.2 or 1.5 volts requires more than 1 to 1.5 volts for proper charging.For example, 1.2 volts will charge properly only if we provide 2-2.5 volts. The Mobile battery is rated 3.6 volts, but the charger provides 5 volts.Even though the battery is 1.2 volts, it may show 1.5 volts in fully charged( New one only). But when we connect the load, this voltage suddenly drops to 1.3 volts and remains stable 1.2 volts for many hours. See this is applicable to only healthy battery. I think,the problem is in your charger. It should provide minimum 2 volts for single cell and 4-5 volts for 2 cell charging.

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