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Results tagged with power-supply
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user 4831
An electronic device that supplies electrical energy to a load. It can be AC or DC input. Typically DC output.
19
votes
Accepted
USB with only two leads?
Sadly, this seems to be common: USB cables that carry only power. To my knowledge that is not according to any USB spec. And it is quite frustrating because such a cable has no marking to distinguish …
- 48.8k
4
votes
Accepted
Microcontroller shutting down in etched circuit, but works as expected in breadboard circuit
Is your circuit diagram complete? If so I miss the mandatory decoupling capacitors!
You don't mention the type of microcontroller you use, from the diagram I assume an 28-pin PIC like a 16F876 or 18F …
- 48.8k
5
votes
Deciding between 7.4V and 11.1V power
You don't mention what kind of unit you have, especially what kind of power supply circuit it has. You need to know what current it draws at those two voltages. You did not tell us, so for all we know …
- 48.8k
2
votes
9V, 2A DC power supply
Your question is very vague. Do you want a linear or switch-mode supply? What is the range of input voltages? How accurate must the 9V be, and what ripple is allowed? Do you need (over) current protec …
- 48.8k
20
votes
How to use external power supply for Arduino Uno?
An Arduino Uno can be powered by
a stable (regulated) 5V DC, which you can either supply via the USB power lines, or via the shield connectors, or
an unregulated 6-20 V DC (7-12V recommended), which …
- 48.8k
2
votes
LM317-based adj power supply output takes a while to stablize
My firts guess was that you have an abnormally large value for C7, but you say that the effect also occurs without C7, so that can be ruled out.
A you sure you didn't set your DMM to some weird setti …
- 48.8k
2
votes
Computer power source
Check,for each voltage, that the replacement can deliver at least the current that the coriginal can deliver. That seems to be the case. If the connectors are the same, I see no harm in trying (unless …
- 48.8k
1
vote
How can I turn on and off a switch every 20 minutes?
I don't think the 'use a microcontroller' answer is very usefull to Tushar. The good-old 555 won't do 20 minutes, even his CMOS simbling probably won't.
But there is another oldie that some people s …
- 48.8k
3
votes
Accepted
Where should I put the fuse in this circuit ? Critic the design
I would put the fuse between pin 1 of the terminal block and R3. Directly after pin3 is probably just as good.
I hope R3 is not realy 10k?
And I hop you are aware that the circuit before the 7805 i …
- 48.8k
8
votes
Accepted
Diode between VCC and GND
I nearly always put such a 'fools diode' in my circuit, even when I am breadboarding. Reverse power will kill most of the chips I use. Over-current protection is a function for the power supply, not f …
- 48.8k
2
votes
AC to DC power supply
"motors need 12 to 24 volt and 1.6A current"
do they need 12 or 24 volt? Or do you want to be a able to regulate the voltage? (It is more common to PWM the power to the motor than to vary the voltag …
- 48.8k
2
votes
Accepted
Making a power supply that offers two voltages
I assume your microcontroller circuit does not need much current (~ 100 mA), so a linear regulator (7805 style) will not get too hot. If not, consider a switching regulator.
Using a low-dropout regul …
- 48.8k
3
votes
Accepted
How to automatically detect the required power supply voltage for a sensor?
You could
use two pins, provide 5V on one and 3V3 on the other, and wire the sensor accordingly.
provide 5V, and let the sensor derive 3V3 from it if it needs that voltage
use an LM317-style regula …
- 48.8k
1
vote
What is "current rating" in a battery implied by?
"Current rating" always refers to the maximum allowed current. It is the responsibility of the user of the device to make sure that the current stays withing this limit.
The device in question might …
- 48.8k
1
vote
Why does my laptop adapter output nominal voltage with a broken capacitor?
In general you can't assume that a failed component will cause a failure of the overall module.
In your case:
Your multimeter can only give you one value (a sort-of average), it can't tell you whe …
- 48.8k