# All Questions

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79 views

### Generating a delay on the order of microseconds (timer vs HAL_Delay())

So I am using an nRF24 radio module and I probably need a 10us delay after enabling chip select. But the thing is I can't use HAL_Delay() since the least it ...
88 views

### How to protect GPIO from back current? Diode?

After frying a Rpi with this montage 6 months ago: I followed advice from kind users here and modified the wiring to this back in February: It has been working fine for 6 months and suddenly ...
4 views

### How to design a no-load detection circuit and auto cutoff if load is not presented?

How to design a no-load detection circuit, I couldn’t find a reference design, Is this possible task to perform? Load is an LED setup, 150V DC, 30mA If load is not connected to the circuit, power path ...
23 views

### Electret microphone to USB soundcard

I am trying to interface a suite of aviation audio headsets to my PC. The headsets use an electret microphone requiring a voltage bias of 8V - 16V for power. Each headset plugs into its own instance ...
3 views

### calculate ADS waveform average value

I wanna get the average value of the output waveform of my circuits to calculate power consumption, either voltage or current. They are complex numbers, so how can I do that in ADS?
38 views

### What is the the purpose of the capacitor in this relay circuit?

What is the the purpose of the 470 uF capacitor in this relay circuit? Why there is no relay protection diode in this circuit? The relay is used to toggle a voltage divider circuit.
85 views

### Can we do better than CCCV charging?

For some background, most if not all modern charging solutions for lithium ion batteries use a CCCV model for charging: As the diagram explains, we charge at a constant current, and then "...
38 views

### Asking for help/guide to design over 1mA current circuit with 5000Vrns and 150C operating conditions

I hope everyone here has a high spirit for help Dear all, I am designing an over 1mA current detector circuit using IN193 with a supply voltage of 5000Vrms to the test sample IC at 150C temperature as ...
14 views

### Questions regarding transistor audio amplifier circuit

I have a few concerns with the audio amplifier part of my circuit which I hope somebody can help me with... It's part of a larger circuit but the schematic below shows the parts of the circuit which I'...
6 views

### LC Oscillator Simulation

I am designing a LC CMOS Tail injection based Oscillator but somehow the node voltages are constantly showing errors. The circuit schematics are The properties of MOSFETs are as followed: Node ...
317 views

### DC-DC converter and trim resistor

I'm using this DC-DC converter +/-5V output version and I decided to use the trim up setting to get as close to 5.5V as possible. I determined the resistor value using this formula And got around 3....
55 views

### Level Shifting a MOSFET

I have a high current low voltage MOSFET I'd like to drive with a higher voltage and a micro to reduce power losses through it. I built this circuit based off the typical level shifting designs. The ...
8 views

### Should I solder the shielding wire (braiding) on USB cable for better data transfer?

So Ive cut the USB wire of my racing wheel (like xbox controller) and joined them again, to skip the breakaway USB cable part. While splicing, I Ignored the shielding wires, just picked them off and ...
21k views

### Motor driver using only a 2N2222 transistor?

Is it possible to build a motor driver using only a 2N2222 transistor? If yes, then how?
23 views

### Building an ultralight electric hoist, what gearbox reduction / motor combination for torque / power requirements?

I am building an electric hoist. Design requirements: Lightweight Quiet Relatively low lifting requirements (100 kg) Relatively fast lifting speed (80 fpm -> .4 m/s) Low cost Simple Force ...
2k views

### What is the use of this diode in the circuit?

What is the use of this diode in the circuit? I guess it is used for short circuit protection and turning off the LM2576.
75 views

### What is “charge dumping”?

In the datasheet of the Texas Instrument AMC1200 isolated amplifier the mention that C3 and C4 can be used to reduce "charge dumping". What is meant by charge dumping? How useful are C3 and ...
231 views

### Interval measurement in Verilog

I am writing my Very First Verilog Program Ever: I'm trying to capture intervals between incoming pulses. I have a sample clock, an asynchronous pulse source, and the output is a registered 8-bit byte ...
22 views

### IC datasheet and MOSFET selection question

I am trying to design a buck converter using TI's LM3150 synchronous buck controller and I am wondering how to read some of these specs and how to select MOSFETs based on gate charge: https://www.ti....
24 views

### Confused about op amps and wiring for parabolic mic

I consider myself a fairly smart guy (20+ yrs web programmer, Computer Science degree), but in the past couple years, I've started to delve in the realm of electronics design and I'm constantly ...
46 views

### How do I measure the amount of energy consumed by a device?

I am considering installing solar panels to power a shed. The shed will need a lighting, a fan, a heater, and some other appliances. How do I measure how many kilowatt hours of energy is consumed by a ...
792 views

### Control stepper motor with PLC?

I'm pretty much brand new to both stepper motors and PLC's and electrical in general, although I have an idea of the theory of how they work/what they do. I am trying to achieve is to be able to have ...
12 views

### PSR Flyback Power supply

From this Reference Design I have two questions: They are doing PSR (Primary Side Regulation) with LM5020. However, according to the datasheet LM5020 is a Current Mode PWM Controller which was not ...
8 views

### Part Number for : IC TOP Marking number 3SDM

I could not get the part number from IC TOP marking. The TOP marking shows 3SDM. I am looking for manufacturing part number against TOP Marking
21 views

### DC Motor/Generator current flow

So I am in the midst of learning circuitry, and cannot for the life of me understand what dictates the direction of current in a DC Motor/Generator. I understand that a charge applied to the negative ...
47 views

### D flip flop with asynchronous reset circuit design

I've been looking at the circuit for the D flip flop with asynchronous reset and I do understand how the overall circuit works, but I can't understand what the point of connecting the wire in the red ...
21 views

### TL494 current limiting without current sense

Is it possible to limit the current without using current sense feedback in TL494?? The TL494 have two amplifier both of them sensed only voltage (12V_A & REF) from buck regulator and TL494 limit ...
173 views

### Alternatives to Jumpers?

I have a need to be able to connect a lead on a circuit to 1 of 5 different other leads. I think it’s obvious how I can accomplish this with jumpers or DIP switches or encoders. The wrinkle here is ...
161 views

### Push button de-bouncing, nothing works. [Please, only answer if you have actually done it (recently or often enough) to know for sure!]

I see a lot of text on the internet and here telling us how to de-bounce a switch, in my case a push button. But I have tried all these circuits and I find that nothing other than a 555 monostable ...
30 views

### butterworth configuration of multi-stage amplifier

When doing a multi-stage operational amplifier, people usually use butterworth polynomial to set closed loop pole location of the op amp in feedback configuration, and then back calculate to open loop ...
17 views

### Why Offset nulling circuit not working in Proteus simulation?

I tried simulating the offset nulling circuit for LM741 in Proteus but it does not work: The inputs are grounded and the rail voltages are +15V and -15V. Potentiometer is connected to the nulling ...
424 views

### Manufacturers' recommendations for ground plane for GPS patch antennas

I see requirements for specific ground plane sizes in many GPS antenna datasheets, but I also see many devices that ship with significantly smaller ground planes. Do these integrators know something ...
23 views

### op-amp differential amplifier - output is the same with Vcc

I'm tring to use a OP-AMP LM358P as a differential amplifier. The circuit I'm using is like below; According to what I've study and expectations of SPICS, the out-put should be about 2.5(V1-V2). To ...
29 views

### Shorting the Output of a voltage regulator

I am using this Buck Converter Input Voltage Range - 8-16V Output Voltage - 5V Load Current - 550mA This 5V is the power supply (Vcc) to the mentioned IC loads : Microcontroller , LED Driver , 2x CAN ...
345 views

### Altium - Handling Multiple net names for buses

I'm confused on how to solve this warning on Altium. ...
276 views

### How to properly use a relay module with JD-VCC from Arduino/Raspberry?

I got two 4-relay-modules and I am probably doing something wrong because none of them seems to work: My first try was using a breadboard 5v power supply, connecting VCC and In1 to 5V and GND to GND. ...
231 views

### TPM 3VSB power capabilities

I have a question about Trusted Platform Module header on PC motherboards. I want to install ESP8266 (standalone) inside of my PC, I know of 5VSB the the PSU supplies, but after looking at my mobo ...
21 views

### confusing with tl494 application circuit

According to tl494 datasheet on application section. For buck converter, they use error amplifier with 101x gain to control swithching duty cycle and then for curent limit, they use high gain error ...
623 views

### Can two voltmeters connected to the same terminals show different values? Circuit with induced EMF

The circuit shown below consists of two resistors connected in series that form a closed loop. No electrical sources are in that loop.Let’s assume that the resistance of the wires that connect the ...
322 views

### Why is Impedance Represented as Complex Number Rather than a Vector?

I am trying to understand why impedance is not represented using vectors. I assume it is due to complex numbers having the property that $$j = \sqrt -1$$ but with my limited knowledge I can't see how ...
271 views

### Amplify Raspberry Pi Zero W Audio with 60s Tube amplifier circuit

First of all, thank you for taking a look at my question. Electronics is not my field of expertise, and I have found myself a bit stuck. I have been restoring some old 50s and 60s tube amplified ...
16 views

### Lithium ion pack showing 0V after BMS/protection circuit but pack is actually 40V

I recently purchased an electric skateboard and I ended up having some issues with the board turning off as soon as it started to move. I figured that there was an issue with the lithium ion pack so I ...
54 views

### How do I know what MOSFET to use?

I am using an Arduino Nano that has output pins of 5 volts. I want to use the Arduino nano S pin to open and close a MOSFET for powering on and off a Benewake TFmini Plus distance sensor ( http://en....
426 views

### Find the transfer function of the circuit if current I is the measured output

So there's this problem I am trying to solve: Consider a series RL circuit corrected to a DC voltage source and an on-off switch. Assume R = 2 ohms, and L = 1H, and applied voltage V = 10 volts. ...
12 views

### dependent current source polarity

In this question, I apply the current cycle law, I find the current i1 to 25uA. I find the voltage on the dependent current source -2 volts. When I go through the formulas, there is no problem here. ...
31 views

### Thyristor Voltage Waveform in a Full Wave Bridge Controlled Rectifier at Discontinuous Mode

I'm having some trouble to understand the thyristor voltage waveform for the full wave bridge controlled rectifier. I plotted the Voltage at the secondary, the current at the load, the voltage at the ...
27 views

### Reducing Current of WS2812 LED Circuit

I'm looking to drive 10 WS2812 LED's at reduced brightness to limit my max current draw below the maximum 60mA per LED. I'm looking to reduce maximum brightness, even when PWM is set to 100% duty ...
43 views

### Routing decoupling capacitors to a micro-controller

I'm attempting to design and make a Keyboard PCB and have stumbled onto a question I can't seem to find online (probably because I'm not searching for the right thing/lack of info) When routing ...