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This amplifier is built after some good thoughts considering its previous models, they even provided an aux switch with it and non of the sell know how that works, its tpa3116d2 2.1 as you can see in the pic there is an aux switch ((aux sw) at the back of the Bluetooth antenna/aux jack ) ig...
I'm trying to repair a Denon AVR-X4500H home theater receiver. The fans over the heatsink stopped working and it overheated and shutdown into protection mode.
Having repaired audio amplifiers in the past, I focused my efforts on checking the power transistors (FETs) first and found one channel...
Hi! I'm a 2nd year student of EE and need help in solving this assingment.
Operational amplifier uses two reverse biased Zener diodes, calculate output voltage (in the picture 'Uiz')
Hi,
I am trying to amplify the ac input signal but any input value results in 0V output, Can anyone what's wrong with my circuit? I don't want to use a voltage divider bias configuration.
Hello,
I am demodulating differential signal using LPF based demodulator. The schematic of the entire system is attached which includes diff modulator, coupling capacitors, and demodulator.
A modulated signal of 17 Mhz is demodulated. For the demodulator, I designed a 2-stage differential...
I am having trouble getting my DAMGOO TPA 3116 Bluetooth amplifier board to power up from an Anmbest 6S 25.2V 15A 18650 charger PCB BMS protection board. The battery pack is wired according to instructions with six 18650 rechargeable batteries. I have charged the battery pack. It tests at 19.4...
I want to make two new speakers fo my computer. I have found a amplifier with 2*50w+100w and 3 drivers: one subwoofer 100w 8 ohm and two tweeters 5w 8 ohm. I don't know why but i think i'm about to blow up my tweeters. I can't find a solution to decrease the wattage of the 50w output. Can you...
Hello everyone. I need help to find analog of operational amplifier. Original one broken on circuit of my 3D printer. I found some similar parts, but i am not sure, that i right about this parts, Photo of original amplifier below.
Hi all,
I simulated a 3rd order Sallen-Key High-pass Filter and got the frequency response shown below (Fc = 6Hz)
Now I built the same circuit in practice, but I am noticing that at around 10Hz the output signal is being amplified, with the most likely cause being that the frequency response i...
So I bought this cheap bluetooth receiver along side a class-d amplifier board in hopes of connecting the two together to make a portable bluetooth speaker. This chinese amplifier board uses 12-24V dc and has a power out connection which provides 5V dc (probably specifically designed for a...
I have the following circuit. I have some problems and I can't identify the reason.
1.Why I have such a distorsioned output voltage?
2.Why Vmax is aprox is 25V ,but Vmin is 29V?
Hi
I need help to boost low pulse to high.
I have a sensor which detects no of pulses per second.
For some vehicle it couldn't detect it is a low pulse signal.
Please suggest some circuite which can boost the signal.
Hi everyone
I'm not an EE by any means, i guess this could be a simple question but...
What does the letter 'B' stands in this datasheet formula?
It's found here, page 10
https://www.st.com/resource/en/datasheet/cd00000128.pdf
I should amplify a low impedance signal with the peak of maximum 1.4V.
The tricky part is that the signal itself is not important but the tail of the signal is important which might show some decay (falling edge could reach to zero sooner or later than normal) and these signal decay variations...
I need some advice on what is the quickest way to change the alert signal output through a amplifier to run a fixed tone transducer with on board tone driver ? Problem to start with is my customer has issues of the speaker alerting device on this agricultural implement monitor is too quiet . So...
Hi,
I am trying to build a lock-in amplifier circuit using AD630. But the signal which I wanted to detect is in the megahertz range and AD630 is not functioning in this region. So, is there any device which can do lock-in like AD630 but in a higher frequency region?
Thank You.
I currently made a module to my project which isn't quite functioning correctly. It's 4 distinct parts on one board. The radio I/O, the two independent sound amplifiers out of the LM386's and the RFID card reader.
This is the circuit:
The actual inverter IC I used is 74HCT04 because it...
As part of a broader project, I am designing IC circuit using CMOS to one of the first steps I'm working on is the filtering a series of pulses with of the noise. The actual pulses are around 1 kHz so I am implementing 2nd order sallen-key high pass filter. Since the capacitance is limited to...
Hello everyone,
A brother from my hometown told me to make a mini amplifier that can pull the power out from a USB charger(or PC USB).
I happened to working on a logic gate IC and burned the IC while using a USB(power bank) charger. I want to know is it safe to use a 5V-1A charger to power the...
I am trying to build transconductance amplifier circuit to obtain values of the reverse biased photodiode (PD) current in order to estimate some of the LED characteristics.
At first, I have used the scheme named “Recommended Zero Biased Circuit” from page **broken link removed** (placed at the...
Hello good people,
I need help. I'm posting a schematic of an ultra low noise amplifier. It is to be powered by batteries. For that reason, I need a stable DC solution in the place of R4 resistor. I was proposed to achieve that by using another JFET and an integrator circuit, but I am not...
Hello! I am an absolute beginner learning electronics by working my way through the Make:Electronics book by Charles Platt. I have a long way to go, so I am hoping someone can give me some guidance on a project I am working on now.
I would like to have 4 small piezo microphones independently...
I have a 8ohm 30W speaker and lm386.
I don't know much about the internal structures of lm386. I want only bass sounds(frequencies) in that speaker. How can I do that?
And I also want to know how to smoothen the high frequency sounds?
Hi All:
I spent a few hours tweaking this using common parts to about 90% efficiency.
It can do more power out with a > 36V supply. No AM modulation , yet.
Hello.
I'm simulating a simple amplifier to be used as input and VAS stages for an audio power amp.
It uses negative feedback. The gain is 20, fixed by the ratio of R4 / R3.
I know this kind of circuits usually need some kind of frequency compensation to avoid oscillations.
The circuit is...
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