Questions tagged [step-up]

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Is this 5V-UPS circuit useful? [duplicate]

I have attached a picture of a circuit for my UPS: My goal is to supply my Raspberry Pi a few seconds longer after power failure. VCC = 24V, +5V = regular 5V supply voltage via LM2596. UPS = 5V ...
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4 votes
0 answers
81 views

Can this Raspberry Pi UPS circuit work?

I created following UPS circuit to shutdown my Raspberry Pi 3A+ properly: I would really appreciate if somebody can review my circuit. I know it's a little bit hard to read, but I'm sorry. I'm a ...
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1 vote
4 answers
189 views

Power transformer circuit using H-bridge doesn't work as expected

I am trying to step up my AA battery's voltage (which is 8 volts in total) using an ignition coil (which is rated for 12 volts input.) To drive the coil I am using an H-bridge at a frequency of 50 kHz ...
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0 votes
0 answers
53 views

Should I use one thick wire or many thin wires in a step-up high frequency transformer to reduce resistance and impedance?

I am planning to make a step up high frequency (hundreds of kHz) transformer. I want to reduce the resistance and impedance in the secondary. Should I use one thick wire in the secondary, or should I ...
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1 vote
1 answer
76 views

How to best power small loads from 1.5V batteries in a kit? [closed]

I'm trying to build an electronics kit (so THT parts only if possible) that I would like to power from a single AA battery. The circuitry on the kit uses 3.3V 74HC series CMOS parts and should ...
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  • 490
0 votes
2 answers
63 views

Can I charge a 4000 mAh Li-po battery with a single TP4056 module?

I bought a single 4000 mAh lithium-polymer battery and connected a step up converter and TP4056 module. I am providing a circuit image; the only difference between the image and the actual circuit is ...
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1 vote
1 answer
66 views

Choosing a transformer for 120V->240V AC step-up for low current (<1 W)?

I've got a device (microcontroller-based energy monitor, https://shelly.cloud/knowledge-base/devices/shelly-em/) which I'm using to measure energy consumption of 240V split-phase devices (motors). ...
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-1 votes
3 answers
123 views

Why is the output on my high voltage generator producing more amps than I would expect

I recently bought a high voltage generator of off amazon that apparantly steps up 3-6 volts to 400kV. I wanted to know how much amperage the output woud produce out off curiousity and measured it to ...
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1 vote
1 answer
104 views

3-phase star transformer connection with no neutral for wind turbine

I built a wind turbine a while back and have been using it to power lights in my house. It gives out 3-phase in star setup with no neutral. Neutral is buried in epoxy resin in the casting. It feeds ...
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2 votes
1 answer
251 views

How should I understand this 1.5 V to 90 V voltage step-up network?

I am learning about Jim Williams's avalanche pulse generator. It is in page 93 of AN47 - High Speed Amplifier Techniques. I don't understand the circuit's voltage step up network, which is 1.5 V to ...
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  • 208
0 votes
2 answers
105 views

Help understanding use of step-up boost converter

I have a Ryobi battery that I'd like to charge from 12V instead of 230V. The charger comes with a power supply that outputs 36V 1.7A, so I thought I could easily replace this with at step-up boost ...
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  • 1
0 votes
2 answers
88 views

Using 220-240V 50/60HZ appliance in US - transformer or wiring/combining of two separate phases?

I have an appliance rated to be working in 220V-240V, 50/60HZ. The typical power draw is 1000W, max - 1500W. For the 240V environment where it is now, the typical/max current draw is less than 5/7A. ...
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0 votes
0 answers
78 views

Switch between power supply and battery when using step-up converter on the battery

I'm making a project to supply 12V to a fan, and these are the conditions (questions after the pictures in case you want to jump to them): It will be able to switch between the 12V power supply and a ...
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-2 votes
2 answers
311 views

Why the output voltage of no-load boost converter is increase continuously?

I'm designing the boost converter with 3 mH inductor and 680 uF capacitor 20 kHz fequency. When I try with 12 V, 5 A power supply in the input and fixed 50% duty cycle, I can reach the 24 V output ...
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-7 votes
1 answer
75 views

low harm taser using a 9v battery and booster [duplicate]

I was trying to build a low harm taser using a 9v battery and boosting it using https://robu.in/product/1000kv-step-up-power-module/?pid=890238 the following booster does to hurt a lot and what would ...
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  • 9
0 votes
1 answer
76 views

Reduce noise from step-up switching regulator

I have a sensor that outputs a signal between 0-5V and i set a simple window comparator with open drain output (TLV3402) connected to a micro-controller so i can detect when sensor is below a ...
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1 vote
2 answers
86 views

Will this Step Up Converter solve my problem?

For a project I am doing at home, I need to convert a 5v digital output from an Arduino to a 12v digital output to power a motor. A solution I found for this is using a step up converter. The step up ...
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1 vote
1 answer
92 views

How to use 18650 instead of A23 battery to power 12V door/window sensor

I have a security/alarm system running, it uses multiple door/window sensors (433Mhz), which use A23 12V batteries. These A23 battery are non-rechargeable and quite low on capacity (used in 433Mhz ...
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1 vote
0 answers
57 views

Unwanted switching noise on the output of the MCP16417 (DC-DC, step-up converter)

I want to use the MCP16417 step-up DC-DC converter for a low power battery powered project. Before implementing the design on a PCB I wanted to try the chip and built the circuit (top circuit on page ...
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0 votes
3 answers
223 views

Can anyone help with an Ultrasonic Transducer Transformer design. Air gap or no?

I am looking at using a centre tap transformer with a 12mH secondary to drive a 50W 40kHz ultrasonic transducer (4100pF 10-20Ohm resonance impedance) for cleaning applications. The input voltage is ...
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-1 votes
1 answer
74 views

Which voltage converter will work for my amplifier? [closed]

I recently moved to France from the United States. I am in the market for a voltage converter for my markbass amplifier: From the little research I have done, there seems to be a general consensus ...
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1 vote
0 answers
59 views

Step up converter problem PAM2423AECADJR

I have problem with a step up converter made with the PAM2423AECADJR. I have an input to the converter 3-3.7 VDC and regulated the output to be 5 VDC. I am driving a DC motor (1.5A max) with the 5 VDC,...
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-1 votes
1 answer
79 views

What/Why is the upper voltage limit on step-up converter?

I bought one of these; they are sold all over the place: The input voltage is listed as 3.6-6 V DC, and the output is at 20 kV. They require quite some current, and what I have laying around that ...
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  • 99
-3 votes
2 answers
521 views

Can a MOSFET or transistor be used to switch on a 9V supply using a 3.3V signal?

***Technical question, not a wiring problem. I am building a bicycle alarm system and I'm a little stuck on the alarm output. I wonder if I am approaching this problem wrong. My alarm piezo ...
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2 votes
1 answer
91 views

TPS61046 wrong output voltage and high current consumption

I am designing a circuit to control a multiplexed led matrix and for that I am testing two boost circuits. The TPS61046 and the TPS61080. My idea is that the input voltage is via USB or a Li+ coin ...
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2 votes
4 answers
119 views

Is it possible to step up dc without changing it to ac or pulsed dc? [closed]

I've been looking at dc to dc step up converters/voltage multipliers, and they all seem to make it ac or pulsed dc and reconvert it to dc at the end. Is there a way to step it up directly? A clock ...
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  • 47
0 votes
2 answers
170 views

Boost converter single cell AA battery not delivering enough voltage when connected to Wemos D1 mini

I must power a Wemos D1 mini at 5V (more on that below) (along with 4 LEDs and a DC motor) with a single cell AA battery. I have tried 2 boost converters (Vin 0.9V-5V) and none worked. I need 5V for 2 ...
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2 votes
1 answer
211 views

Step up 3.3V to 5V to use as power of op-amp

In my previous question I was thinking about how can I "reuse" this circuit (0-10V, 0-20mA and digital contact input), when I only have 3.3V regulated power available from my LoRa Node: ...
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  • 529
0 votes
2 answers
141 views

Is it a good idea to use a ceramic inductor for a DC-DC boost converter instead of a wire wound one?

I would like to use an SMD assembly service in order to pick and place the components directly to my PCB. There is a DC-DC boost converter (DD06AJSA) on the board which includes an inductor: I need ...
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0 votes
0 answers
84 views

Boost converter depending on load

TL;DR: Output voltage of boost converter depends on load. I assume because the load is altering the voltage between the base of the boost transistor and ground, thus altering the duty cycle. No idea ...
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0 votes
1 answer
83 views

Can MCP16251/2 DC-DC step-up converter tolerate higher input voltage than the set output voltage?

I am trying to figure out the best possible circuit for MCP16251/2 feeding from 2 AA batteries in series with an output of 3.3v. MCP is extremely efficient boost converter with very low quiescent ...
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-1 votes
1 answer
65 views

Help understanding a circuit (li-ion charger with 5v step-up) [closed]

In the circuit below, as well as in the typical application schematic for the tp4056, bat+ connects directly to bat- with a 10uF capacitor in between. Why doesn't this connection end up shorting the ...
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1 vote
4 answers
349 views

Stepping up three 3V3 outputs to 5V

I want to use the third solution from this answer to step up three of my GPIO pins from my Raspberry Pi. Would I need to make one of these circuits for each of the pins or could I, for example, ...
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  • 15
1 vote
2 answers
103 views

3.7V to 7.5V step up circuit

I need a circuit which can step up the voltage from my 3.7V Li Ion battery to 7.5V. The current requirements are pretty small (up to 50mA max), but I have a latching solenoid which requires a short 7....
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  • 27
0 votes
0 answers
67 views

DC to DC converter options

I'm admitting here that I'm a little out of my element, so take that into consideration. I am working on a project that combines a few different electrical devices that use different DC power sources. ...
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0 votes
1 answer
422 views

How to safely use a transistor to control fans

I'm working on a project where I control two 12V 80mm fans with an ESP32. I've taken inspiration from various blog posts about fan control on the Raspberry Pi with a transistor (e.g. https://fizzy.cc/...
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0 votes
0 answers
109 views

How much Amperage can pass through a BMS and DC stepup boost converter?

In my Mini UPS project for my router, I made a little circuit by using a 18650 li-ion battery charger module, a 3.7v /2800mAH li-ion battery, and the DC step-up boost converter. My router requires 9v/...
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1 vote
1 answer
37 views

Step up regulator with fading input

I have an input power source that fades an LED on and off smoothly, from 0 volts to 7.5 volts. I would like to use a 12 volt LED. I have been looking at step up regulators which look suitable for ...
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0 votes
2 answers
136 views

Step up 3.3V to 5V and draw 500mA without a voltage collapse/break down

I would like to step up 3.3V from my power supply with the help of a dc-dc-boost converter to 5V and then I want to draw 500mA by placing a 10 Ohm resistor between the output-pin of the boost-...
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-1 votes
1 answer
71 views

I designed a circuit to receive multiple AC voltages at the input and constant voltage at the output, but I wonder if the circuit makes any sense

I wonder if this circuit has any meaning and if it will work as I expect. I would like to know before I build it, due to lack of time. What I want from this circuit is to give motorcycle lamps the ...
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0 votes
1 answer
80 views

Amplify signal going to motor of kids electric car

I have a 6V electric kids car (similar to power wheels). I want to convert it to 12V. Since it has a lot of electronics that are dependent on 6V I was just thinking of keeping the electronics fed by 1 ...
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  • 101
1 vote
3 answers
62 views

Raising Amperage

I am designing a DC circuit for my project and I have hit a brick wall that has got me stumped after hours of research. So far in this sheet of the schematic I have started to make a PDB like chain to ...
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1 vote
0 answers
55 views

I need help identifying DC/DC converter AH4V55V5S-1W

I need some help identifying the component in the picture above. It is a step-up DC/DC converter. Input is approximately 5V from USB converted to +/- 6.8V. It is used in Micsig’s differential probe. ...
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1 vote
1 answer
71 views

simple DCDC Step Up converter mystery

I'm designing a self sustaining guitar that has 6 amplifiers onboard and runs on a li-ion pack. Power draw is a about 2.5A when on "full power" and I decided to make my own step up converter ...
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  • 15
0 votes
2 answers
129 views

High current through Mosfet in boost converter?

I want to make a simple boost converter to step 5V up to anywhere from 30V to 65V I want to be able to vary my duty cycle to be anywhere between there. Did I chose a correct mosfet? I would like a ...
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  • 479
0 votes
3 answers
222 views

Turns ratio of transformer not on datasheet

I'm currently looking for transformers to generate high voltage spikes (several kV) on the secondary by suddenly changing the voltage (and therefore the current) on the primary. Ideally, I'd have a ...
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  • 170
0 votes
1 answer
261 views

Voltage control for MT3608 / TP4056

I'm looking for powering up the Raspberry Pi by a few 18650. It looks like MT3608+TP4056 are somewhat cheap/common way of managing LiPo batteries as a backup power. I checked the specs and looks like ...
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  • 115
0 votes
1 answer
119 views

Does V_EN have to be equal to V_IN to be "high" on an step-up dc-dc converter? (MT3608 on/off control)

I have an MT3608 step-up converter[PDF], that I'm using to power a small fan (DC 12V 0.1A) with a DC 5V (4A max) power supply. On my board V_EN and V_IN are soldered together ex factory, meaning it'll ...
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  • 288
1 vote
2 answers
126 views

DC Step-up Boost Voltage regulator (High Ampere)

I’m working on a project, where I want to go from 5 Lithium-ion cells in series, to 5 Lithium-ion cells in parallel, for versatility purposes i.e. in time, I want to be able to change the output ...
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  • 11
2 votes
0 answers
123 views

Why does this 6V solenoid activate on 4 AA batteries but not on a MT3608 step up booster?

I have a JF-0530B 6V solenoid that is rated at 300mA, and if I hook it up to 4 AA batteries it indeed activates on the roughly 6V the batteries supply. However, I also have an MT3608 step up converter ...
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