Unanswered Questions

3
votes
0answers
62 views

Get rid of the AC 50Hz noise from circuit

I made a bread board, this board is intended to measure AC 50Hz signal from sub uV to hunderds of mVs. The entire system is floating, powered from a voltage transformer. The front end is like this, P1 ...
3
votes
1answer
196 views

Difference between virtual and ground plane

Ive created two PCBs, a power board to output a +-5V supply and a midway voltage reference (using the TLE2426) at 0V. This PCB powers a biosignal acquistion board shown in the spice diagram below. ...
1
vote
0answers
13 views

How to modify this circuit for variable clipping without affecting gain?

Below is a basic implementation of a circuit used to clip an incoming signal using the diodes in the feedback loop of the op-amp. Since the diodes are different they have different characteristics, ...
1
vote
0answers
14 views

Does a 40 MHz radio frequency have any interference to Bluetooth signal?

From my understanding, the Bluetooth signal is using a 2.4 GHz frequency. However, when someone is playing with a 40 MHz RC vehicle, the Bluetooth signal keep on getting interrupted or disconnected. ...
1
vote
1answer
60 views

Help with a RF reciever circuit

Recently I have been working on a basic RF receiver, but my efforts so far have proved fruitless. I designed the following circuit based of of previous research into the topic. According to what I ...
1
vote
0answers
27 views

Electret Mic Circuit Using JFET Bootstrap

I thought this circuit was clever so I'm sharing: The JFET current source is bootstrapping the electret and thereby providing 20dB of linearized gain. The bootstapping network also provides for ...
1
vote
0answers
23 views

RFID reading / sniffing demonstration at a live-event

In the context of a live-event, we want to demonstrate how easy it is for someone with the right equipment to sniff RFID devices, including clear-text information. Our idea is to hide a RFID reader ...
1
vote
1answer
36 views

driving LEDs via a PI a attiny and TLC5940 (validation) and possible powering issues

at the moment I am planning my first real (big) electronics project. I want to build a LED lamp, that can be controlled by a RaspberryPi (for e.g. programming a binary clock or changing the brightness ...
1
vote
0answers
74 views

Capacitor bank with variable speed motor

I have a set of three pumps (power ~100 kW) with variable speed AC motors and I would like to know the best option(s) to reduce the cost of reactive energy. For instance, would it make sense to ...
1
vote
0answers
56 views

5V DC over data lines

I am prototyping the below diagram and using the following Common Mode Choke from Murata 50475C (4.7mH DCR 0.7R). When I input a signal on U1 Point B 3Mhz D = 50%, I can see AC coupled signal on U2 ...
1
vote
1answer
296 views

RaspberryPi I2C sensor - capacitor's role

I'm new here and the same goes to my electronics "history". I like to understand things I'm dealing with even if I wasn't provided with a sufficient knowledge background at schools. What I'd like to ...
1
vote
0answers
1k views

What sensors are commonly used for vehicle detection?

I want to make a vehicle detection prototype. I find there are multiple choices of sensors that can be used to detect a vehicle, such as acoustic, ultrasonic, infrared, magnetic inductive sensor. I ...
0
votes
0answers
17 views

Class D amplifier output filter calculation

I want to build a simple amplifier with TI's TPA3116D2, which is "filterless" Class-D amplifier. This device can be run with a traditional LC filter at the output, or, if the speaker wires are short, ...
0
votes
2answers
27 views

Powering SMD 5050 strip via LM2596 DC/DC converter

I decided not to order / use the power supply typically sold with SMD 5050 kits. I heard a lot of explosion stories regarding those dodgy stuff. I want to make my own (power supply to drive SMD 5050. ...
0
votes
0answers
30 views

Synthesize the following transfer function using op-amp

How do I synthesize the following transfer function using an op-amp based analog circuit: \$ \dfrac{(as^2+bs+1)}{[K*(1+sT_1)(1+sT_2)(1+sT_3)]}\$ where a=5.01046e-7; b=1.56922e-4; K=111.33; ...

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