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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Hi, I am new here. I have a broken motherborad that I would like to fix. The laptop is an Acer nitro AN515-54. It worked fine until it wouldn't turn on anymore. When the power supply is plugged in, i read 19.58v on the power connector. Then, I followed the current up to a mosfet that I think...
Hi everyone,
I am working on an RFID reader using HTRC110 with a coil antenna of 18cmx12cm but I could not get the desired range (at least 10cm) for a small tag 10*12mm like this one Hitag S 256 Pigeon Ring. In this document HTRC110 Application note I found out that I can use external power...
Hello
I am using a MOSFET driver circuit with SI2303 as p-channel mosfet and SI2302 as n-channel mosfet.
I have given control signal (of 5V) on the gate of n-channel mosfet to turn-on and off the p-channel mosfet.
However, the p-channel mosfet is not getting off and I am constantly finding...
Hi everyone I am new on here and only getting my toes wet with electronics. But I want to build something to switch a ground for a solid state relay. I have a 0-5 coming from a laser and when it reaches a gives height it will trigger the ground on the ssr I would like to have a rotary...
Hello,
I'm designing a circuit to ring a bell using a code set by the user. When powered the circuit steps through the code which is set via DIP switches to decide where a "ding" or a space should be within the code. Each "on" position within the code actuates a modified car relay which hits...
Hello there,
I'll start by saying I'm by no means an expert in electronic design, so please bear with me. Also my schematic and the datasheets I'm using will all be attached to this post.
I'm designing a circuit whereby the output of a 4017B IC is driving a relay via a BC337-25 BJT Transistor...
I’m looking for a circuit that can protect 3-6 Volts AA Batteries when a short-circuit happens. When the short-circuit happens, a second circuit (LED blinking) must be triggered and the batteries must be protected. The goal is that the LED won’t stop blinking until the short-circuit is undone...
Hi.
I have the need to drive two MOSFET boards in opposition.
When signal from the signal generator (5v Arduino type signal)
I want two have two MOSFET boards operation is opposed
When signal is high MosFet 1 is on and MOSFET 2 is off
When signal is low, MOSFET 1 is off and MOSFET 2 is On...
Hello everyone. I would be very grateful if you can help me with this circuit I am working on (sch.png).
It consists of a TP4056 charger/controller (Photo 2) connected to a 3.7v/3Ah Lithium Ion battery to supply a low battery level indicator, and a load (three white leds and two fans) through a...
Hello Everyone...
I am trying to make a Low Voltage Buzzer Warning that beeps on and off, without a microcontroller....
I have a latching detection circuit here that puts out about a 6V signal until the battery is dead, then it drops off and latches off until it is reset....
This is the...
Imagine situation when you have to switch mosfet on, but its not possible becouse current "can not flow".
This thread would be just theoretical. For knowledge. This actually do not represent any circuit I build.
To switch Q2 On (For discharging something), you need to apply 20V (above 5V) to...
Read about N-CHANNEL MOSFET’s. Gate and Base act as a capacitor; When gate reaches Threshold Voltage it allows current to flow from Drain to Source terminals by attracting negative charged electrons in between, constructing a conductive bridge.
It is easy to select two oposite charges on DC...
Hello!
I would like to ask for some help in my circuit. What could be the possible reasons why my IRF540 doesn't turn off?
I check the gate voltage of mosfet when I toggle the gate of 2n3904. when I put 5v on the base of BJT the gate voltage of mosfet is 0V and when I switch it to ground the...
Hi!
Here is the project:
I bought a spotlight which contains 4x 50W LED Lamps. The spotlight is powered by a 28VDC battery. My vision is to control the spotlight with a mobile app (turn on/off and blink the LED's). Also the space inside the spotlight is limited (10cm X 7cm X 4cm at most since...
Are switched mosfet boosts, like this 5A device, designed to handle brief load peaks which are many times higher than it's rated 5A?
http://www.xlsemi.com/datasheet/XL6019%20datasheet-English.pdf
thx
Hi,
I'm trying to calculate the gate resistors for the MOSFET that I selected which has a gate resistance of 1.3 ohms. Well, I attach its electrical characteristics (Parameters.PNG). Also, I add the Vgs vs Total charge curve. I would like to find the suitable configuration for this application...
Is ZVS (zero voltage switching) possible in LTspice? :)
In that case? How do I implement that in the simulation? Do I need special transistors that is not included in LTspice I imagine...
What I understand, compared to hard switching, ZVS (soft switching) make sure to to reduce the turn ON...
Hello :happy:,
I have in the recent days tried to simulate the temperatures levels in a charger (AC/DC-module) in a Heatsinkcalculator software:
**broken link removed**
Based on the power losses calculations for half-bridge, where we have two MOSFETs that are operating one at the time,
where...
As part of a broader project, I am designing IC circuit using CMOS to one of the first steps I'm working on is the filtering a series of pulses with of the noise. The actual pulses are around 1 kHz so I am implementing 2nd order sallen-key high pass filter. Since the capacitance is limited to...
Hello,
I used the LT8312 PFC controller to controlling the switches, but somehow the switches seems not to operating in the bridge, only the diodes.
Do anyone know what could be the problem why the switches do not operate?
And how do I change the switching frequency to 150 kHz? I think that I...
Hi,
Recently I watched an old EEVBlog episode (#102) where Dave discusses and builds a basic constant current load. To try it out, I quickly built the circuit on a breadboard and got curious to fully understand how it works. For the op-amp I used the LM2904 and for the mosfet a STP60NF06, then...
Dear people,
I'm designing power electronics for 3-phase 3KW SR motor by using power MOSFETS of rating 600V. To drive the gates of these MOSFETS, I'm using IR2183 gate drivers, one per each phase.
The DC voltage at the drain of MOSFET is directly from the DC capacitor link which supplies...
I have a current sense IC powered directly from a battery. I want the current sense IC to be in the shutdown state when the 3.3V power supply is disabled.
I have added a dual N channel MOSFET circuit (see attachments) to achieve a pull down on the shut down pin (active low and internally...
Hi,
I work as inverter and dc / dc designer, but I'm new in three-phase motors' subject.
I should make a project sketched in the figure.
the characteristics of the motors are in the picture.
I say the pilot will be in open loop.
how are the discrete components (MOS or igbt) dimensioned in...
Hi everyone.Here is a a circuit showing how a "PWM Solar Charge controler" works. the principal work of this controler is using arduino's PWM to switch on the transistor 2N3904 to let the 12V battery absorb the energy from the solar pannel when the voltage of the solar pannel is bigger than the...
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