amplifier

Hello everyone I need a help to repair Technics SUV90D amplifier. I'm using a translator, so I apologize in advance if anything is unclear. The problem is that the amplifier suddenly stopped working. After removing the cover, I noticed a blown fuse. I thought that was the only problem, but after...

Hello everyone! I spent months doing this spreadsheet, trying to make something that has its worth in the help of designing a BJT CE amplifier stage. Really simple, resistive base divider, resistor on the emitter to linearize, collector resistor for simplicity... But the transistor model is...

Hi everyone! I saw this amplifier in another thread on this site and decided to build it to drive power to a very simple DC motor modeled by a resistor and inductor in series. I get roughly 9.6V at the output node which after some research is enough to power a simple dc motor. I'm a second year...

As part of my ongoing project, I need to drive a Piezoelectric ultrasonic speaker. I have 1 of each that resonates at 20khz and 25khz. The max my sine wave oscillator can give out is 5v RMS, and the max the speakers can handle is 20v RMS. So to get the max out of the speaker I need a...

You are provided with a 230 V / 50 Hz ac supply, a 6-0-6 centre-tapped transformer and a BJT of dc current gain 150. Biasing the transistor using a supply of 5.6 V (develop your own), (i) design an amplifier of voltage gain 200; (ii) If this amplifier were to drive a load of 75 Ω, what will...

Like after building l amplifier of that will produce some volts output can I test the same with a voltage source of 0 to. 30mV instead of actual device ? How will the circuit behave?

Hello, I disassembled HCD-RG295, its an audio system with CD, Decks, radio, and amplifier, and I want to take amplifier from it and make it work with aux, but I am not very much knowledgeable of what to do to make it work. I would be happy if it had like aux, volume control, and that's all. I...

I bought a CAD gxl 1800 condenser microphone on Amazon but found that it had too much noise and gain. I removed the preamp board inside and added my own preamp using the mpf 102. Although not that sensitive, it is better now. I use my microphone to record my rap because I like to rap. The...

hello, I have an analog electronics exam, and i hope that someone might help me understand the course thank you.

Hello, i'm a student and i need a bit help to understand a circuit (attachment). Attached is the schematic of the DO2 meter from DFRobot (https://wiki.dfrobot.com/Gravity__Analog_Dissolved_Oxygen_Sensor_SKU_SEN0237#More). The circuit gets attached to galvanic DO probe, which should output a...

I’m in the process of replacing my 1980’s Napco Magnum alarm system panel with an up to date panel that I’ve built. I’d like to duplicate the speaker output from the original panel. Putting a ‘scope on the output, I see an approx. 1,250 Hz square wave output going to the speakers. Kind of what...

I have created my own Class D amplifier based 2.1 Karaoke Music System using ready to connect modules according to the following diagram to create the music system. I have used probably three very common modules which many of you may already be familiar with. I am still linking sample Amazon...

Hello please help Im a DIY notive i have some basic knowledge but struggling to identify whats causing resistor to keep burning on my eltax A-8 subwoofer amp circuit board. Reason it blew was I played music to high and burning started coming from subwoofer. I've replaced the speaker but now its...

Hi folks, Since I wanted to revise the basic configuration of BJT, I read this chapter from Purdue University based on the Book of Sedra (https://engineering.purdue.edu/wcchew/ece255s18/ece%20255%20s18%20latex%20pdf%20files/ece255Lecture_13_Feb27_BJT_Basic_Config.pdf) at page 13 where he wrote...

I'm designing a simple amplifier for educational purposes. Please ignore that this amplifier is very sensitive to changes in the transistor's DC current gain. I calculated some component values, then simulated the circuit and realized my calculations were way off. Could you help me identify...

I am trying to simulate a circuit from an exercise. I am confident that I have calculated everything correctly, but unfortunately, the simulation does not match the calculation. The amplification in the upper half of the waveform is weaker than in the lower half. I suspect that the cause of this...

Hello everyone, I'd like to build an audio speaker/amp but I don't know much about it and I'd like to know where to turn. The purpose of this speaker would be to be both portable and pluggable on sector, to be used in student gatherings with my school. My hope is that if it's plugged into the...

Hi Everyone, I have a couple of CA3080 OTAs at home. I would like to design an AGC amplifier with it. Does anyone have an example of AGC amplifier? I couldn't find any example on datasheet.

I need help with the following circuit problem: Find the time response of the circuit. Write the Laplace transform of the circuit equations. Attached is the circuit diagram and its equivalent transistor model. Any detailed steps to solve this would be greatly appreciated! Thank you!

Im new to these kinds of stuff, very noob question here but I found an old car amplifier with a sub on it (attached photo). I’ve watched YT vids on how to actually make it work. Im just wondering if in the “bridged” speaker out i can just put a female 3.5 mm to bare wires. since i only have...