1. K

    Amplifier 50 Hz hum

    I'm trying to detect the source of the problem and hope you can help me to where should i look for it. So when I'm raising the volume on the amplifier the hum gets more quiet then if its 0 volume.(Without any input, just the speaker connected) It's not ground loop probably. Already checked.
  2. Younes Thabet

    How to interpret an audio jack schematic?

    Hello all, I have the attached datasheet for an audio D/A converter (CS43L22) which have stereo headphone out/line out. I couldn't understand fully the audio jack schematic in the typical connection diagram, specially the difference between the highlighted elements!? can someone explain the...
  3. D

    the first BJT amplifier audio

    Hello, I can't seem to find the first all BJT audio amplifier. When and who invented it?
  4. MasterG

    Help Improving TIP41C Audio AMP

    So i always have been interested in audio amps, and i created this one. It works pretty well considering that the TIP41C is not "ideal" for this aplication, but i want to know how to improve it(get more power out of it maybe), my power supply works up to 30v DC 12A, so not a problem around...
  5. T

    Add Gain Stage in Vacuum Tube Guitar Amp - N-Mosfet Source Follower

    The idea: To "re-purpose" V2 in that V2b (cathode follower) becomes the "added" gain stage between V1b and V2a. This is achieved via N-Mosfet source follower replacing the cathode follower. In doing some reading, thinking and simulating (not yet tinkered), I have arrived at what I think might...
  6. T

    Trying to fix a Marantz 2216 Part 1 of ?

    Picked this old project up again. I'm out of practice working on electronics but did enjoy it in college. Got a tone on the input, increased the volume until I got about a 1VAC on the main amplifier input. Checked the DC voltages and they seem ok, however one channel is not amplifying. I'm...
  7. L

    Balanced Audio Preamp Circuit

    I tried to make a preamp circuit but I'm not getting any output at all. The simulation on LTSpice seems to work well. The Op Amp I'm using is LMV821 datasheet I'm using a balanced dynamic microphone Zener Diode is 5V1. I don't mind if its noisy as long as I get a some sort of amplification from...
  8. S

    oscilloscoper analysis from my final project (about guitar pedal effects)

    im doing a final project about making a guitar pedal effect, and my lecturer ask me to compare it to commercial guitar pedal using an oscilloscope. i made 4 effect, reverb, echo, chorus, overdrive, all of this effect showing almost same result as the commercial effects, but the reverb one doesnt...
  9. Echo26

    Protect E03 on Sony Amp

    Looking for answers, I have a Sony Shake 6D Hifi system and has E03 power supply tag error. However for some time. Unit is working like a couple of hours but after minutes sometimes E03 triggers. I did check the voltage. And they were nominal as indicated by the service manual. I have seen...
  10. J

    Tips for bipolar power supply

    Hello, I need to design a linear regulated supply to power an dac output stage based on op amp. It must be a negative + ground + positive one. The problem I encounter is that I don't know wich topology to select between the first and second arrangement. I suppose that the first one induce a...
  11. 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...
  12. Z

    I'm constructing a audio amplifier in LT spice, some good starting points?

    Hello, i'm new here on AAC. I've seen alot of interesting topics, questions and answers here, so i would like to be part of it. Question: It is for a school assignment, and i'm choosing to build a multistage amplifier (Pre-amp and Power-amp). What is a good starting point when choosing values...
  13. A

    Install a basic sound system on a soviet car

    Hello all, I bought a very simple car of soviet design (a lada) that doesn’t have a sound system installed on it. I want to build a basic setup to plug my iPod in via jack 3.5mm to be able to listen to music when driving that car. I can get cheap 12v AC 100w mono amplifier boards here in the...
  14. A

    Noob Question - Simple volume control for PC and PAM8610 amp

    Hello everyone! First of all, if you're beginning to read this, please understand that I am very new to electronics, I have little studies but I can at least not produce cold solder...most of the time. I also can't use the standard drawing softwares yet, as my knowledge is far from this (The...
  15. nikolopikolo

    Audio amplifier

    Hello, I have decided to build my own loud speaker from scratch. That means tha I will be building my own power amplifier. Now I want it to go as loud as it can so about 500W RMS should do it. I want to know are there any sites with schematis of such amplifier and I want a qulity one not...
  16. D

    Need some advice on a tda 2003 audio amplifier.

    Need some advice on a tda 2003 audio amplifier. Hi I've built a mono amplifier based on this schematic: https://www.circuitsdiy.com/tda2003-amplifier-circuit-diagram/ However, when I turn on the supply (a 12v hobby supply) I either get lots of popping or humming and if I can stop that by...