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How is 50Hz CM is routed back to earth in class 2 supply?

I read that the high freq noise suppressing cap added between high freq transformer of an smps causes 50Hz to leak to the DC output; so that by using other caps this CM is routed back to the earth. ...
user1245's user avatar
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14 views

Equivalent Low Power Pseudo SRAM

I'm looking for the equivalent of Low Power Pseudo SRAM : S/N = CS26LV16163C (CHIPLUS) Can you help me find an equivalent of this reference obselete ? Thanks. Datasheet_CS26LV16163C
Maxime BOISDRON's user avatar
-1 votes
0 answers
9 views

Issue with DXF import Altium, due to out of bound error

I am importing the DXF of a cad to the mechanical 1 layer for the reference. But i am getting an error "Invalid PCB area, out of Bound"due to which i could not place DXF at the origin of ...
Raviteja Cherukuri's user avatar
-1 votes
1 answer
61 views

Why isn't this inverter based amplifier amplifying?

I was studying about CMOS inverter an amplifier for analog applications instead of its more well known application as a switch for digital circuits. For the following inverter based circuit : I think ...
Koustubh Jain's user avatar
0 votes
1 answer
27 views

Expected voltage when probing a computer pwm-fan socket's sense pin?

I'm using my multimeter to probe a proprietary 6 pin socket on the motherboard of a pc computer that connects to 2 small 25mm fans. The socket's pins are unlabeled. Both the motherboard and socket are ...
Mike's user avatar
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-1 votes
0 answers
55 views

LEDs fail. Divern by CC BJT driver

A second prototype batch tested by the CM all of a sudden have many LEDs fail. Three 100 mA (1 A pulse) IR LEDs are connected in series and driven with a BJT constant current source — 168 mA, 5 % duty ...
MMG's user avatar
  • 29
0 votes
1 answer
19 views

Feasibility of Using Xinya XY2500 4-Pin Pluggable Terminal for Three-Phase PCB

I am designing a PCB for a three-phase system and considering using the Xinya XY2500 4-pin pluggable terminal connector (pitch 5.08 mm, rated 15A @ 300V) to connect R (Phase 1), Y (Phase 2), B (Phase ...
Shubham's user avatar
0 votes
0 answers
58 views

How to prevent leaking batteries in multimeters

I'm having issues with leaking alkaline batteries in my multimeters (Fluke 17B and Fluke 325). The batteries were from reputable brands. I think the solution for this problem may pass by a periodic ...
AmssmA's user avatar
  • 496
1 vote
2 answers
102 views

Understanding the discrepancy between Input and Output power in ZVS Induction heater

I am using a ZVS induction heater like this: Image Source The schematic looks akin to this (schematic has not been tested) Schematic Source I modified it with IRF3205 N-Channel MOSFETs for better ...
15 Volts's user avatar
  • 677
2 votes
1 answer
123 views

FPGA Block RAM: Does Read Enable being low save power?

I am trying to understand the actual purpose of the read-enable signal on synchronous FPGA Block RAMs. I do not see the actual need of it. But regardless of why it was put there in the first place, ...
quantum231's user avatar
-1 votes
2 answers
53 views

Is the blue Weller WECP-20 ESD safe?

There are two Weller WECP-20 soldering stations. One blue and one black. The black one has a label "ESD SAFE" and the blue have no ESD label at all. But is the blue Weller WECP-20 still ESD ...
euraad's user avatar
  • 1,308
2 votes
1 answer
232 views

How can I understand hexadecimal columns as power of 16 in Jeff Duntemann's book?

I am studying this book: x64 Assembly Language Step-by-Step. Programming with Linux-Wiley (2024) JEFF DUNTEMANN If I understand correctly, 1 in hexadecimal is equal to 1 in decimal. However, the ...
F. Zer's user avatar
  • 123
0 votes
0 answers
28 views

Wiring and Chaining 5050 RGB LED Strip

I'm new to using LED strips and PD-powered devices, and I need some advice on setting up my project. I'm aiming to create two compact RGB lights that can be daisy-chained together. Each light unit ...
Vincent Lewi's user avatar
-1 votes
0 answers
29 views

ASIC design of a current-to-voltage converter for a high input current dynamic range (50n-10u and output is 5V) working in a very low frequency

I am trying to design a current to voltage converter to fabricate on silicon without using any premade IC with the following specs: Input current range: 50 nA to 10 uA. No/Very low bandwidth ...
Vishesh Gupta's user avatar
0 votes
0 answers
37 views

Finding poles of the transimpedance amplifier

I`ve been having problems with finding poles of one transimpedance amplifier. Acording to LTSpice the first pole should be somewhere around 1.6MHz, but I cant get that (I am getting about 200MHz). I ...
Огњен Пискулић's user avatar
0 votes
0 answers
40 views

Adding loudness compensation to tube preamp

I am trying to add a compensation circuit very similar to the one explained here to a tube preamplifier based on a simple E88CC common cathode stage + cathode follower. I am adding the compensation ...
Andres Martinelli's user avatar
2 votes
3 answers
152 views

NCP1117 (3.3V LDO) with ceramic and aluminum electrolytic capacitors

For my ESP32 project I want to use a NCP1117 3.3V LDO and soon the question came, which capacitors are suitable if the LDO is driven either by USB or a 5V power supply while the cable length is about ...
Tintenfisch's user avatar
2 votes
1 answer
55 views

Electromagnetics - Calculating electric field vector given an equipotential surface

I'm trying to figure out how to calculate the electric field vector given an equipotential surface with the equation \$ x^3 + y^2 +z = 1000 \$ where x, y, z are positive. The potential on the surface ...
Amit M's user avatar
  • 591
0 votes
0 answers
31 views

I am researching components for a new design that incorporates a device similar to a charger used by an electric toothbrush

On one charger we found a circuit in the charger body made up of a coil of fine copper strands while on another manufaturers device we find a complex circuit board with the ID " SEAL HL-3761"...
Shockjock77's user avatar
0 votes
2 answers
57 views

A simple question about differential receiver circuits

I solved the difference receiver circuit problem in the picture with the following formula but I am not sure of its correctness because I do not have an answer key. I would like to discuss whether it ...
softcalculate's user avatar
0 votes
1 answer
35 views

555 IC - Role of Resistor in Capacitor Discharge (Astable mode)

I can't grasp the role of resistor Ra in this circuit. I know that when the output from the SR latch is low, the transistor doesn't allow the capacitor to discharge. And when the output is high, ...
João Amaral's user avatar
0 votes
2 answers
64 views

Dual power supply, AC to ±12V DC, based on LM7812 + LM7912

I'd like to build a power supply, based on the LM7812 and LM7912, that outputs both +12 V and -12 V. I found this circuit online: According to the datasheets, the LM7812 has a typical dropout voltage ...
bmatcuk's user avatar
  • 113
0 votes
2 answers
68 views

Differential amplifier Q point

I'm looking for a way to solve the Q point of this amplifier I found this set of equation : EQ1: I=Ic3(1+1/Beta3)+Ic4(1+1/Beta4) EQ2: Ic1/Beta1+Ic2/Beta2=Ic4-Ic2 EQ3: Iout=Ic3-Ic1 EQ4: Ic1(1+1/Beta1)*...
exolune's user avatar
  • 59
0 votes
1 answer
53 views

Decreasing the input offset voltage of two stage opamp to below \$1 \: \text{mV}\$

I'm working on a two-stage opamp constituted by MOSFET transistors. The important specifications for this project are Open loop bandwidth of \$30 \: \text{MHz}\$ Closed loop gain of \$2\$ A standard ...
Carl's user avatar
  • 4,028
0 votes
0 answers
35 views

Resetting d type flip flop with a trip signal after a delay

Context: A push button is used to toggle with the help of d type flip flop an output let's say an led, when a trip signal is received the output is to be shut down after a delay let's say 5s. Current ...
Wali Touseef's user avatar
0 votes
1 answer
46 views

Finding it hard to track connections when they are under the protoboard/perfboard

What I really like about creating the connections underneath the protoboard/perfboard is that you can create really compact circuits. Also, since there's no insulation, it's easier to make multiple ...
wyc's user avatar
  • 245
0 votes
1 answer
70 views

Experiments with Tesla coil

What happens if you replace the secondary Tesla coil with a different conductor? Everyone knows that the operation of the coil is a resonant structure. My question is, how the Tesla coil will behave ...
Dillinger's user avatar
0 votes
0 answers
36 views

Help Needed: ADNS-9500 Optical Sensor Movement Detection with ESP32 Wroom

I'm currently working on a project with an ADNS-9500 optical mouse sensor and an ESP32 controller board. The aim of the project is to move the optical sensor and have the ESP32 recognise the movement. ...
A.invents's user avatar
0 votes
3 answers
103 views

Is possible for information in a logical circuit to travel in the opposite direction as the current?

Is possible for information in a logical circuit to travel in the opposite direction as the current? I'm asking about theoretical possibilities, not the current status. For example, if circuits used ...
wepajakeg's user avatar
1 vote
3 answers
74 views

How to offset a sinusoidal voltage centered at 0 V for power grid measurements

I am trying to take voltage and current measurements from the power grid (120V 60Hz) and process them with a 3.3V based digital signal processing board (TI F280049C launchpad) I am using LV25-P and ...
Larcron's user avatar
  • 11
1 vote
0 answers
26 views

Identify Regulator from Canon Camera CMOS Board

I'm trying to Identify 3 Regulators from a Canon Camera CMOS Board The only hint I have is L814, A1BE5, LA42 But I don't know how to find the actual reference of the parts, I need them to repair my ...
Gamer Gamer's user avatar
1 vote
1 answer
44 views

Simple Circuit To Bypass Preamp When Battery Fails

A guitar has an on-board battery powered pre-amp between the pickups and the output jack. This is great until the battery fails, when it goes dead until the battery is replaced. I would like to have a ...
Argy's user avatar
  • 11
1 vote
1 answer
54 views

Testing Thermistors and Resistor that reads as a Capcitor

I have an Air Source Heat Pump that has stopped working, I have an error code which is: Faulty thermistor - dead short/open circuit. There are 5 thermistors in total, one built into the power board ...
Alan A's user avatar
  • 209
0 votes
0 answers
90 views

Why does the author assume \$R_{in} = 1/ g_m \$ for this this circuit?

The following circuit is from Chapter 13 of Analog Design Essentials, page 1324, written by Willy Sansen. Calculate \$R_{in}\$ for this circuit. The author thinks \$R_{in} = 1 / g_m\$ However, $$ -...
kile's user avatar
  • 853
0 votes
1 answer
29 views

Sigma-Delta ADC Sample/Conversion Rate to be clarified

Basically a, let say 1MSPS, SAR ADC takes 1 million samples a second, and then we do some math with those samples (averaging, sorting/taking median, digital filtering, etc...) to obtain a good ...
Nkgunel's user avatar
  • 31
0 votes
1 answer
65 views

Cyclic Voltammetry for a Capacitor - Positive Current, Potential is decreasing?

In the boxed red region, why is the potential decreasing when the current is still positive? To my understanding, when the current is still positive (i.e. not changing direction), the capacitor will ...
photon's user avatar
  • 1
0 votes
0 answers
20 views

Verify whether the Motor Driver has PWM Support

I was looking for a single channel motor driver with a supply voltage range of 6V - 12V and a continuous current range of 2A. I came across a motor driver IC called SS6285L. This motor satisfies the ...
Kailash Kumaravel's user avatar
0 votes
0 answers
26 views

Device Power On Reset Requirements in SoC

I need to release the RESETn signal after all power supplies and clocks are stable, and de-assertion should be at least 100 ms(Im using 47nF in CT to create delay of ~200ms) , my idea is to connect ...
Knowledge's user avatar
  • 431
0 votes
0 answers
18 views

VHDL: Assert generic range and produce error with full instance path if it fails

In my VHDL entity there is a generic that has integer value. I have written an assert statement to check its range. I believe that the assert statement will execute when the module is simulated and ...
quantum231's user avatar
-1 votes
1 answer
63 views

Butterworth Filter for SMPS

If the performance of a Butterworth filter is dependent on the load impedance how do high voltage high power 1kW+ SMPSs manage to achieve smooth output ~100mV peak to peak across wide ranges of load ...
beardeadclown's user avatar
0 votes
2 answers
56 views

ESP32: How can I use USB for data only, but always require external power?

I am creating a PCB where a ESP32-S3-WROOM-1 sits on, which shall be powered by an external power supply (and a NCP1117 3.3V LDO) and not by USB. However, I will use USB to flash the ESP32, so the PCB ...
Tintenfisch's user avatar
2 votes
2 answers
447 views

How does this over-voltage protection diode work?

I saw this schematic for the RPi power supply with USB-C. I do not understand how the D1 diode acts as over-voltage protection. Can someone explain? The image is from the RPi documentation.
void_brain's user avatar
0 votes
0 answers
30 views

Convert PWM negative signal to either On or Off signal

I am trying to make a simple conversion circuit to take a negative PWM signal from my cars dome lamp signal and simply make it or or off. I believe I should be able to use a PNP transistor and ...
Jaxon's user avatar
  • 1
-1 votes
0 answers
22 views

relay not switching on and off the peristaltic pump when conditions are necessary fo the pump to be switched on and off [closed]

i have a raspiberry piwhich is supposed to switch on and off the 2 pumps when certain temperature conditions are reached. But the relay is not switchinh on or off the pump. The pump is always on. i ...
Elvis Chikudza's user avatar
1 vote
3 answers
116 views

Switch ELECTRICALLY SAFE between 3 resistive loads (16 A each) on a 16 A line

How to switch 3 resistive consumers (heaters), each having a current consumption of nearly 16 A alternate & ELECTRICALLY SAFELY (German standards)? So that only one of them heats at a time and the ...
Lux's user avatar
  • 111
0 votes
0 answers
49 views

Why Capacitor can't behave like smoothing DC effect in AC motor Phase shift application?

Capacitors in AC-to-DC power supply will work as smoothing after Diodes, which means it is charging on Positive peek, and will store charge on decrement of Peek, so it is providing smoothing DC Output....
Adil Ahmed's user avatar
0 votes
0 answers
33 views

ESP32: Does PCB without copper affect the keep-out zone of the antenna?

Espressif recommends in their PCB Layout Design that the antenna is placed outside of the board, either top right or bottom right. Interestingly a placement to the top left or bottom left is not ...
Tintenfisch's user avatar
0 votes
0 answers
37 views

Noise observed in QPA2935

I am using a "Pulsed biasing board" which provides the drain signal and gate signal to a power amplifier. I am interfacing the same with QPA2935 driver amplifier(DA) Please find the ...
Sahasra Vaiishnavi's user avatar
3 votes
2 answers
167 views

18650 battery holder corrosion

I'm using a Keystone Electronics 18650 battery holder #1043, link below. The connection between the cell terminals and the battery holder seems to have what I think are slight corrosion issues. I take ...
tomdabom's user avatar
-2 votes
2 answers
89 views

Would a current pass in a resistless wire, like a superconducting one, when its ends are connected to the terminals of an ideal battery?

Would a current pass in a superconducting wire, when its ends are connected to the terminals of an ideal battery? If the answer is yes, wouldn't that violate KVL because the voltage rise in the source ...
Jack's user avatar
  • 299

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