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Results tagged with voltage-regulator
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user 11683
A voltage regulator is an analog circuit that produces a stable output voltage that doesn't vary with input voltage or load changes. Switching regulators are much more efficient than linear ones.
2
votes
Accepted
Simple voltage regulator - problem with low temperature
Why are you using Darlington transistors in a low-voltage design? To begin with, the VBE of 1.4V is greater than your reference voltage — I'm surprised this circuit works at all! As it is, R32 has jus …
- 175k
1
vote
Accepted
Is running two voltage regulators in parallel safe?
Do the math on your power budget:
The Pi needs up to 2.5 A @ 5 V = 12.5 W
The motor needs up to 3.0 A @ 12 V = 36 W
That's a total of 48.5 W
Taking the efficiency of the converters into account, …
- 175k
2
votes
How to keep solar panel voltage at 24V?
The box was mislabeled. The "PMP" is a reference to the panel's point of maximum power output, and that's saying that the panel's nominal voltage is 36V, not 24V as it says on the box. Maybe they're i …
- 175k
0
votes
Warm voltage regulator
Yes, it's probably the regulator itself. It works by controlling the field current into the alternator in order to regulate the alternator's output voltage that is charging the battery. It sounds like …
- 175k
6
votes
Accepted
Voltage regulator for DC motor
The motor needs a lot more current than the LED does. You need to reduce the value of R1, or remove it altogether, connecting the motor directly to the regulator (assuming the motor can take the full …
- 175k
1
vote
Using a Micrel MIC2940A-3.3 LDO regulator without additional circuitry?
Do the math: How much current does your device draw, and what is the voltage drop across this regulator? This determines how much power the regulator must dissipate. Does this fall within the ratings …
- 175k
18
votes
Accepted
What is the purpose of R2 in this discrete voltage regulator circuit?
R2 simply makes sure that there's a certain amount of current flowing through Q1 even if no external load is attached to the circuit. This is called a "minimum load".
It also makes sure that a certai …
- 175k
2
votes
Accepted
LM2596, Voltage divider causes delay in voltage changes
The problem is that you are using your voltage divider also as the "bleed" resistor for your output filter capacitor. When you stop the regulator from operating, this capacitor needs to be discharged, …
- 175k
1
vote
Accepted
Power suply 300V regulated with LM317
If the 3k (3.3k) resistor1 is getting hot, it means that all of the load current is passing through it.2 If the transistor is working correctly, only a tiny fraction of the load current should be pass …
- 175k
4
votes
LM317 with potentiometer
The equation is correct — the output voltage is indeed independent of the input voltage — but the equation only applies when the rest of the operating requirements of the device are met, specified els …
- 175k
3
votes
Negative Voltage creating Sinking Terminal
First of all, RS-485 does not normally require a negative power supply. It uses a pair of balanced signals that individually swing between 0V and +5V. Only a +5V power supply is required.
But to answe …
- 175k
4
votes
Can I power a 5V USB hub using 5.33V DC or should I use 7V with a 7805 voltage regulator?
The USB specification is +5V, ±10%, which means that anything from +4.50V to +5.50V will be fine, including your +5.33V battery pack.
- 175k
6
votes
Effective use of output signal of a watchdog timer
With option B, you'll need a separate supply for the watchdog. Plus, interrupting power to the entire circuit is drastic step that will make other things (such as debugging) that much more difficult.
…
- 175k
2
votes
Accepted
How does dumping excess voltage works?
You are right to think that this type of protection depends on the clamping voltage supply to sink current.
Normally, this kind of clamp is used in conjunction with some sort of series impedance betw …
- 175k
0
votes
Connecting a 12.5VDC switch output to a GlobalStar SmartOne GPS unit
The data sheet is on this page; just scroll down to the bottom.
However, I don't see any additional information on the "Combined Serial, LP I/O Cable", which is probably the only other piece you need …
- 175k