1. A

    Modding wireless RF headphones to Bluetooth headphones

    Hi guys, I have been using a pair of Sennheiser headphones for quite some time now (HDR 118). They offer good sound and sit comfortably, however they do work based on RF signals (863 - 865 MHz) and have been catching a lot of interference as of late. Instead of just getting a new pair of...
  2. jacob_c

    Project about CE amplifier on PSPICE

    Hi I'm working on my project about CE amplifier on PSPICE. The circuit given to me is attached below. 1. The first question was 'set bias point'. So what I thought was for DC, capacitor is open circuit. And if we increases V_in, it will cause increase of I_c which will make this transistor...
  3. babaliaris

    I made my first amplifier!

    We kinda learned about this circuit in the electronics 1 lab, but I don't understand everything, i have some questions and unfortunatly my lab professor is quite a Karen and won't even hear my questions... Anyway, these are my questions: 1) Which elements can I mess with to increase the volume...
  4. S

    lm386/why this circuit works well with my iphone audio jack but when i connect a mic it makes so much hiss and noise

    as you can see this is the circuit that I made based on lm386N-1 whenever I connect my iPhone (it's a 5s if it makes any difference ) the sounds works great and clean only when I put it to max it has some distortions but when I connect the electret microphone it makes a lot of noise and hissing...
  5. ThyristorWolf

    Design a Voltage Amplifier

    Hi guys.. I have to design a voltage amplifier.. The first task is to develop a voltage amplifier with an open loop voltage gain (with no attenuation due to source resistance and no loading effect) of about 10 to 15 V/mV where 1 V/mV = 1000 V/V gain. The input resistance of your amplifier should...
  6. A

    Documenting a TRF Radio build

    Greetings, I'm new to electronics and am interested in the field just as a hobbyist. I've read the Complete electronics self teaching guide by Boysen and Kybett and am now moving to Basic Antennas ARRL and Building your own transistor radios by R. Quan. To be honest im attracted to RF...
  7. S

    Need to explain about principle of comparator based crystal oscillating circuit.

    Hi everyone, I am a newbie in electronic field. Now I am trying to design a circuit to drive QCM (Quartz crystal microbalance). In some literature I have seen some comparator-based designs like this: In fact, some similar designs can also be found in the datasheets of high-speed comparators...
  8. R

    Op-Amp Voltage Follower Outputs ~+Vcc when IN+ is 0V

    Hi all, I'm fairly new to working with operational amplifiers and so I'm just messing around with a few basic circuits. Had a comparator working fine to switch an LED on/off based on some variable reference voltage, but now I'm trying to get a working voltage follower. I have 2 different...
  9. Mayank_2606

    Can someone explain me the working of this circuit?? Squarewave Oscillator

    I am new to LTSPICE and have been experimenting with designing with op amps as filters and oscillators I recently came around this circuit of a "squarewave oscillator" in LMx58 Datasheet and with an aim to replicate it i decided to use an op amp in the LTSPICE viz. LT1007 to create a similar...
  10. R

    Calculation of Psat in cadence

    Hi, I am trying to figure out the Output saturation power of an amplifier for different frequencies of operation. I am using the PSS analysis in cadence and it only gives me 1dB compression point both input and output referred. Is there a way to find out Psat directly or from these values? I got...
  11. robi10101298

    Simulation of implemented amplifier in LTSpice

    Hello, I need to simulate the following circuit in LTSpice. I made the scheme but I don't know what value to choose for R2 and Cinf in order to have theoretical gain Av=1500. The following constraints are imposed: Vcc=10v; VCM=1.5V; vg it's a sine wave with a frequency of 1Khz and R1=15kOhms. I...
  12. B

    Rail - to - rail opamp

    Hello, I've read something about a rail-to-rail opamp on the internet and I want to design one, just the soft part, and I am not sure if I get some things right. For example: Let's assume that my Supply Voltages are Vss = -5 V and Vdd=5 V In a rail-to-rail op amp I need my input to be anywhere...
  13. specs365

    How to design a BJT Tansistor Amplifier with voltage divider biasing

    I'm not sure if this has been posted somewhere before, but I can't find anything that really addresses this type of a problem. For college we need to design an amplifier circuit using a transistor, this is not that bad. The problem is that there is no proper explanation that I can find of where...
  14. L

    RFID Power Delivery Wearable

    So I have a project I'm working on a project to light these "NFC fingernail lights": They light up when in the presence of a 13.56MHz RFID field. The issue is other than my phone, I have no way to light them day to day. I would like to develop a device I can hold, like fist semi closed and it...
  15. robi10101298

    Help with implementation of circuit in LTSpice

    Hello, I need to implement the following circuit in LTSpice but I don't know what VCM, Vg,VCC and C infinite are...Can you help me with the symbols for it? Also, the scheme implemented by me it's ok? Thanks!
  16. E

    DC biasing, headroom, clipping in MOSFET amplifiers

    Okay so my question relates to biasing and threshold voltage in a MOSFET amplifier. So in an amplifier the clipping occurs when the signal hits the power rails according to all the reading I’ve done. That’s how much voltage swing you supposedly have before clipping. So if you have an 18 volt...
  17. kjrr.2136

    Amplifier for laptop internal speakers

    Hello i am thinking of making a Bluetooth sound bar out of my old laptop lenovo laptop ( ideapad 510) internal speakers, from the internet i learnt that you need to change the digital signal to analog and then amplify the signal before connecting it to the speaker. I am a little worried about...
  18. E

    Audio Preamp Circuit for a Microcontroller

    I made a pre-amp audio circuit but it doesn't seem to work. I want to amplify an audio signal so that it has a DC offset of 1.8V. I tried to simulate a similar circuit in KiCad and the simulation seems to work ok. Below is the circuit I designed and assembled. On the scope, the voltage is as...
  19. Emad2017

    How Can I submit a novel patentable design idea to a company?

    Hi there, Recently, I have designed a new charge amplifier than can be used to implement a precision and low-cost interface for piezoelectric sensors. I have published an article about the novel proposed circuit in IEEE Sensors Journal. ( A brief information about the new proposed circuit has...
  20. Michael Adventure Hopkins

    EMG amplifier circuit acting highly unstable and often lying at rails

    I have a design for an EMG (electro-myograph) that needs some stability assistance. The core components are an LT6370 in-amp, and an OPA2192 dual op-amp package for amplification and generating a stable reference. The reference is set by a capacitance multiplier that seems solid as a rock when...
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