Of course your Mickey Mouse alligator clips have resistance!
Also, your power calculations are completely wrong.
If the Ni-MH battery has a current of 2.0A and its voltage is 1.2V then its power is 2 x 1.2= 2.4W, not 1.6W.
Hi, MrAl!
Thanks for the help, again.
Having considered my options, I believe that probably building a new power supply would be the most cost-effective.
Besides, I always wanted to build one.
I have a transformer like this:
**broken link removed**
And I am thinking about assembling something like this:
**broken link removed**
I do not understand a few things, though:
How to calculate the max. current that such a circuit can provide?
How to calculate what current the transformer can handle without damage?
Will 17 V input be enough for the LM338 voltage regulator?
And, how to make this circuit protected form short-circuit accidents?
Can you please provide me with an advise or direct me to a source where I can find this information?
Use two AA rechargeable cells in series for 2.0V to 2.6V, then add a high current diode in series to drop the voltage to 1.2V to 1.9V (it is not regulated).
The diode will get fairly warm.
A resistor is linear. If the motor draws 10 times its normal current when it starts then the voltage drop in the resistor is 10 times and the motor might not start (you had that problem with the resistance of your connections).How will this diode in series be better than just a resistor in series?
This seems to be to good to be true, but if it is real you could use a 5 volt supply and this guy.
**broken link removed**
A resistor is linear. If the motor draws 10 times its normal current when it starts then the voltage drop in the resistor is 10 times and the motor might not start (you had that problem with the resistance of your connections).
But a diode has almost a steady voltage when the current chages. The datasheet for a 1N5401 3A diode shows a typical voltage drop of 0.8V at 1.5A. When its current is doubled then its typical voltage drop increases to only 0.85V and at 80A its typical voltage drop is less than 1.6V.
Instead of posting your schematics at that PORN site, please attach them HERE with your replies.
Your unregulated power supply voltage is too high which causes a lot of wasted heat. If a resistor or a power transistor wastes the heat it doesn't matter because the waste is the same.
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