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.

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How to work with the MCP1702?

I'm reading the MCP1702 datasheet and there's the typical circuit on page 2 depicting a 9V source and a 3.3V 50mA output. My question is: How come the current output is 50mA when the spec says that ...
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36 views

Adding a regulating circuit to supply 3.3v

Background I wish to power my circuit with a 18680 battery. My circuit actually has two parts: 1) a 18650 charger and power booster for USB at 5V, and 2) a Bluetooth LE module (running at 3.3v with ...
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2answers
91 views

Powering microcontroller by bypassing ldo regulator

I'm working on a circuit design with a microcontroller that runs on 3.3V. I'd like to be able to power it either through a 3.3v supply or a USB port. I'm using an ...
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1answer
52 views

19.5V to 15V - what's the best way to lower the voltage?

The problem is: I've got a power supply capable of outputting 19.5V 4A. I need to lower the voltage to power up a laptop that requires 15V and 2A. Which way is the best to do it? Construct a voltage ...
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1answer
37 views

Avoid heating with high current

I am new to electronics and just tinkering with it first time. I have laptop charger with 19V/3.42A and connected to 12v regulator and 3.3v regulator to get two voltages - 12v and 3.3v. I am going to ...
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1answer
22 views

Large voltage/amperage battery issues

I have purchased this lithium polymer battery (11.1V, 5500mAh), to power a robotics project. The project uses a Raspberry Pi, three continuous-rotation servo motors, a couple of LEDs and a Sparkfun ...
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1answer
107 views

dropping 24v to 12v simply and efficiently

I have a 24v solar system, and I want to get only 12v from the DC output Currently I am taking a wire from only 1 battery, but this causes unbalance in the batteries and I have to check it a lot and ...
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2answers
68 views

LD1117V33C Voltage Regulator only producing 3.28V

I have a LD1117V33C Voltage Regulator connected to the output of a 5V regulator (LM7805). There is a 100uF cap across input (9V) and a 10uF cap across the 5V. I'm expecting 3.3V from the regulator but ...
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2answers
145 views

How does this slow turn-on regulator work?

I understand R1 & R2 are for feedback which the regulator uses to set output voltage. What is the purpose of the 50k ohm resistor, BJT, and the lower 10uF cap? Does the capacitor & resistor ...
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0answers
41 views

Handmade usb charger

I am a mechanical engineer and I don't have so many knowledge on electronics. I tried to make a solar charger . I had a 12v12ah battery,a solar panel 20w, a battery charger and a dc-dc converter ...
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1answer
47 views

Common-Drain Amplifer vs OP-Amp for unity gain (voltage Follower)

What is the difference between using a nFET vs OP-Amp as a unity gain amplifier, i.e. voltage follower. Application: Provide constant voltage with a variable load, see example below: Min Current ...
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1answer
49 views

Boost converter with 2A load

I'm trying to put together a boost converter to take a 11-14.4v input and boost it to ~17v with a max current of 2A. Most of my designs (made either by calculations done by me or a calculator tool ...
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2answers
49 views

Safety/efficiency of a makeshift aluminium can heatsink?

I had recently received a 9v 1A DC wall-wart off eBay, and needed to open it to swap the polarity of the jack to center negative. As I had the case open, my finger bumped against the metal part of the ...
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1answer
44 views

Buck converter charge battery control output voltage

I have a buck converter charging 8 series of Li-Ion batteries ( 8 x 4.2 voltage of charging) with a source of 36 V. I am using this schematic (from here): I know that for a resistive load, the ...
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0answers
56 views

Voltage divider - intuitive understanding of physics [duplicate]

Here's a voltage divider circuit. Formulas aside, the question is how do things look from the point of view of a bunch of electrons from the ground all the way to both V+ exits? What happens to ...
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1answer
73 views

PNP or NPN Transistor for this schematic?

I am quite new to electronics and hoping to build a voltage regulator using the schematic below. I will be using a 7806 regulator and a 7.4 Lipo battery (yes, the schematic is probably a little ...
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2answers
68 views

Regulate water flow from a water pump [closed]

I have an aquarium water pump of following spec: Voltage : 220V-240V (AC) Watts : 20W ...
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1answer
43 views

Combining two different voltages into one regulated voltage at higher amperage

The Commodore 64 user port has a +5V supply at 100mA and a 9VAC supply also at 100mA. I need about 150mA from the port at 3.3 volts. Is there a way I can use both supplies to get the amperage I ...
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3answers
75 views

Can (or should) two voltage regulators be connected in a parallel configuration. [duplicate]

I have two 5 volt voltage regulators that I would like to connect to a 9 volt source in a parallel configuration. Is this advisable, problematic, or even commonly done? I have tested this ...
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3answers
35 views

TS2950CT50 Voltage Regulator +5V confusing specs / usage

The datasheet for the TS2950CT50 voltage regulator only provides information on the series TS2950C and TS2951C. From what I can tell, TS2950CT50 is a model within that series, which is a fixed +5v ...
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2answers
90 views

TPS61240 Boost converter IC is not working at all?

I am currently using TPS61240 as a boost converter for my project. As i did not have any sample previously so there was no way I could test it. I ordered the IC and placed it on my final PCB directly. ...
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1answer
84 views

How to design a regulator to get constant AC output?

I have a piezoelectric material for energy harvesting. The output voltage is AC and gives 120V at no load. It gives of about 16 mW power and when connected to a load of 50k ohms, the voltage drops to ...
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2answers
215 views

Filtering Capacitors before the fuse or after the fuse while limiting inrush current?

There are basically two questions I have for this circuit. 1) Which capacitor configuration is good? before fuse or after fuse 2) How do I limit my inrush current? My thoughts: I am confused ...
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1answer
341 views

What is the purpose of transistor in this circuit?

"A zener diode voltage regulator is inefficient when the supply is used with equipment that draws high current. When a supply must deliver a lot of current, a power transistor is used along with the ...
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0answers
52 views

Regulator design for negative voltage O/P

In my application, I am generating 7.5V from TPS5430 (Buck) regulator and to generate -5V, I am assigning inductor's one leg to input of 7905 for -5V o/p. Circuit is shown. U14 is TPS5430 and U15 is ...
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41 views

Designing a DC UPS system [duplicate]

My requirements are: I need a UPS system which supplies power to a 9 volt modem. UPS should Charge 12v battery (SLA , charging curent 800ma), and it should have overcharge/discharge protection system ...
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1answer
51 views

Explaination of high current zener transistor regulator circuit

This is a high current zener TRANSISTOR regulator circuit. I want to know What does "high current" mean here? How is this circuit working as a zener regulator? What is the purpose of transistor ...
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1answer
56 views

Difference between DC DC Switching “Controllers” and “Regulators” and “Converter” please?

So I'm looking for a switching regulator for my design, and I head over to digikey... now I'm curious what the general difference is between these categories: PMIC - Voltage Regulators - DC DC ...
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47 views

5V USB Input and Output for Battery Charger

I am looking to create a 5V input 5V output storage device (kind of like a portable phone charger) but I am struggling to choose a battery which is suitable. The device will be used for mobile device ...
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4answers
139 views

Replacing the Arduino voltage regulator

I want to replace the onboard AMS1117-5.0 (broken) with a LM7805. However, the pinout is different between the two voltage regulators; AMS1117: Gnd, Vout, Vin vs LM7805: Vin, Gnd, Vout. I would like ...
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1answer
29 views

Would an analog mux be able to output various voltages?

So from my understanding, an analog mux such as CD74HC4067E will be able to output diferent voltages based on its inputs. Thus for an example if I connect 4V, 3.3V, 2.2V and 0V to a 4:1 mux with 00, ...
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2answers
111 views

LD1117 not providing fixed 3.3V

It is my first question on this site and I'm probably doing something wrong, try to be gentle! haha I want to provide 3.3V to my ESP8266 module from my Arduino, but people say this WiFi module ...
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6answers
123 views

3V6 Zener Diodes With Very Poor Accuracy

I have a question about the regulation accuracy (or lack of) of a 3V6 Zener diode. I wanted to confirm that I wasn't doing anything stupid. I set up the standard test circuit shown below. No ...
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2answers
93 views

low voltage battery disconnect from regulator

I am regulating a lithium ion battery to 3.3V and I want the regulator output to shut off when the regulator can no longer supply 3.3V. I am having trouble finding an IC that would do this, and this ...
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1answer
82 views

FET-based voltage regulator with TL431

I'm looking for some help with understanding (in fact, correcting or confirming my understanding) of how the following circuit works: U1 here is TL431 voltage regulator, for example from Texas ...
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1answer
34 views

Choosing a voltage regulator for a 1.3V to 1.0V drop

I am looking to power a 5V system at roughly 600mA from a 6V AGM lead acid battery (voltage varies from 6V-6.3V). My main concern is finding a regulator that is tolerant enough to deal with the ...
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1answer
40 views

Connect a voltage regulator to another regulator [duplicate]

I'm trying to create a circuit that uses 3.3 and 5v. I'm thinking about use a 9v battery, a 7805 to get 5v and a LM3940 connected to the 7805 to get 3.3v. But I can use the LD1117 connected direct to ...
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4answers
222 views

Zener diode voltage too low

I'm trying to regulate 12V to 4.7V with a zener diode. (I'm doing this to protect an AVR's gpio pin, so the current is very low.) I tried the simplest circuit with the zener, but it does not work as ...
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0answers
52 views

LM2575 Switch Regulator Shows Poor Load Regulation

I'm working on a project powered by a 12V car battery. The overall circuit is broken down into a number of sub-circuits with varying voltage requirements. The 3 voltages used are: 12V Unregulated ...
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2answers
93 views

DC Motor control setup and circuit design. 1.5Hp continuous duty @ 95v dc

I have a DC treadmill motor rated at 1.5Hp @ 95v Continuous duty, though the motor label also states that it is a 2.65HP motor and that the amperage is 21.4. I would like to be able to SAFELY run and ...
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1answer
84 views

Capacitor in parallel with battery for high current output

I have a long-term application with very low quiescent current and infrequent pulses. I've spec'ed high capacity, low pulse current batteries that will give me the lifetime I need, and I want to ...
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2answers
102 views

How to calculate rise time of linear regulator

Given a standard LDO with no soft start, that provides power to a bunch of decoupling capacitors, and a single chip. How do you calculate the rise time of the output rail ahead of time? Is it based ...
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0answers
30 views

regulating voltage acrylic bender

So, I'm starting to build an acrylic bender with 20ga Nichrome wire. I know that the resistance of this product is 1.036 Ohm/ft and I'm planning on using about 3ft. I already have a power supply ...
2
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1answer
34 views

TLV1117 Regulator Thermal Issue

I'm using this Regulator namely TLV1117-50IDCYR for a project that I'm working on. Aparently everything is working fine with this chip but sometimes I feel it's heating too much and I'm not putting ...
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0answers
75 views

TS317 voltage regulator 12v to 3v

I'm building a Star Wars Millennium Falcon and happened that I need 12V to my LED strips and I need 3V to each of my single LEDs; And also to my smoke machine that runs at 3V. I went to the Maplin ...
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2answers
178 views

Is it OK to use switching regulators to charge mobile phones (and such)?

I had several issues with car usb adapters (dc-dc step-down regulators), and I'd like to make one myself. Issues: Nokia cell phone refusing to charge Motorola phone power supply circuitry fried ...
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3answers
69 views

Which way are heat sinks supposed to be mounted?

Which way are heat sinks supposed to be mounted? With the fins around the component, or facing outside?
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1answer
41 views

Low Output from MIC5205 LDO Reg

I have a PCB that's designed to output 3.3V from a 5V source. The 5V source I'm currently using sources several amps (3A), though I only need about 100mA. I based the schematic on "Ultra-Low-Noise ...
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2answers
102 views

Thyristor voltage regulator with different fireing angle for each period with simulink

First of all I'm really low with EE so please, go easy on me. As home assigment we have to design Thyristor voltage regulator in simulink. It should run for 5 periods with different thyristor fireing ...
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1answer
59 views

MC33063 heating problem

I'm using a MC33063 to generate a -9V supply to power 7 TL084's. I'm using a 7805 regulator to power the 33063 circuit. However, the IC and the regulator heats up a lot -- I burned one IC due to that. ...