1. Shotkx

    Help with KEPCO power supply used as AC amplifier

    Hello everyone! I was wondering, how can I understand what is the frequency input range that the KEPCO BOP 72-6m can amplify, when used in current mode, with a sinusoidal waveform as control input ? Should I referent to the BANDWIDTH (d-c to f-3dB) in the Datasheet? or to the LARGE SIGNAL...
  2. T

    Audio Amplifier Without Volume regulator

    Hello, I need Some help, if its possible Problem Description: I've Got Ceiling Speakers Pair (150 Watt each, Max). It has Some Amplifier in box, with only AUX (3.5 mm) audio port and Bluetooth option. It has no volume regulator or anything else. (model No. AMP-BTX 01) I've Mounted it in Ceiling...
  3. genekuli

    I need some help putting together a wideband, radio frequency amplifier and a UWB antenna.

    Hello, I would really appreciate it if there was somebody who could just help me by telling me how to make this. It needs to be only the very bare bone components without any filters. I just need to be told what I need to buy and how to put it together. Ultra wideband, frequency range...
  4. R

    Advice on powering my diy guitar amplifier

    Hello, my name is matt. I have a few questions about supplying power to my audio amplifier projects. I have made 4 Bluetooth speakers and 1 small guitar amplifier so far. All of the Bluetooth speakers have been powered by a 5v battery power supply. Simple Bluetooth amplifier boards and a...
  5. genekuli

    If I hook up a HF ultra-wideband (UWB) amplifier with a transmitting UWB antenna (out) and a receiving UWB antenna (in)

    If I hook up a HF ultra-wideband (UWB) amplifier with a transmitting UWB antenna (out) and a receiving UWB antenna (in) and have the antennas very close (few inches) to each other inside a metal box (~40cm) so as to produce a feedback loop, then due to the noise and harmonics of the over-driven...
  6. xenon_eleven

    Active Butterworth Bandpass Filter unexpected peak

    I am currently trying to design a bandpass filter in a simulator for a university assignment to the following criteria: Frequencies below 1KHz and above 250KHz should be attenuated. Note that you will need to calculate the cut off frequencies given the pass band (1KHz to 250KHz) should not be...
  7. GastonJam

    Transistor as an amplifier

    I'm currently working on this circuit and I run upon this question which I'm not sure I understood it correctly : For starters I have these values below - UCE=5V R1=6.1kΩ R2=1.35kΩ RE=1kΩ R3=1.5kΩ V1=15V IC=2mA UBE=0.4V B=180 Given formula rBE≈40mV / IB First I calculated CE with the use...
  8. CobraL0rd

    Old Amplifier reeks a burned smell and smokes after being turned on

    My mom has an old ~40 year old audio amplifier LUXMAN L-210, that hasn't been turned on for about a decade. I found some time the other day and turned it on to see whether it's working and how it's performing. So it did turn on and seemed to work (I have radio tuner, cassette player and disk...
  9. P

    Electret microphone to speaker circuit

    Below is the circuit I created. I'm trying to to get the electret microphone to amplify through the PAM8403 amplifier into the 4Ohm 3Watt speaker. The PAM8403 has an operating value of 2.5V-5V, claims to work with speakers from 4-8Ohms, and speaker power from 2W-8W. Did I get connect something...
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. 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...
  15. 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...
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. 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...
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