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Results tagged with amplifier
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user 163261
An amplifier can be used to adapt the range of a signal to a requirement, to make it more robust for transmission, or to satisfy interface requirements (like input/output impedance).
7
votes
1
answer
274
views
DC Biasing a signal and what prevents the signal going to the power supply?
The signal enters on the left side of C and gets out on the right side of C and goes to the amplifier.
But this is the problem. …
- 847
0
votes
1
answer
872
views
How to connect this amplifier to my symmetrical power supply?
On another part of the circuit, I have this amplifier, using the IC TEA2025B. …
- 847
3
votes
1
answer
791
views
Isn't C1 and C2 nulling the input signal?
I am a relative newbie to electronics.
Looking at the following schematics I see something strange: C1 and C2 at the input.
I always knew that capacitors block DC signals and let AC pass. By having …
- 847
4
votes
6
answers
604
views
Trying to make an amplifier to work
I am designing a headphone amplifier around the IC TL074. I have this circuit so far.
This circuit is almost good but the sound I see at the output is slightly distorted. … Then I tried to make it an AB amplifier by converting the circuit to...
And now I have no sound at the output. …
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0
votes
1
answer
521
views
A question about AC Ground and Shielding
This is an audio device and it has an amplifier, so I will have shield cables all over the place, from the volume potentiometer to the PCB, from the input/output connections to the PCB and so one. …
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0
votes
1
answer
217
views
As I increase the volume of this amplifier the sound gets choppy and the negative power supp...
I have designed and built the project below.
Open the image on new window or imgur will not let you scale it up and you will not see the components.
This is a 4 channel stereo switch. You press th …
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0
votes
1
answer
162
views
Loud hum and buzz... I think I know why but I don't know how to solve
I have modified the amplifier, as suggested by τεκ to run on the full rail.
This is the modified circuit. … Notice how the amplifier ground is tied to -5 and the power to 5, meaning that it is powered by the 12 VDC coming from the external adapter... see schematics. …
- 847
0
votes
1
answer
764
views
Trying to build a symmetrical power supply from a VDC input without the problems of virtual ...
An amplifier being supplied by this will show a huge amount of buzz and hum. … Another problem with the power supply on the picture is that when I increase the amplifier volume, the LM337 starts to heating fast. …
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0
votes
1
answer
441
views
Plus, Minus, Ground and the damn noise
The midle of the potentiometers go to the amplifier (TEA2025) and the other side of the potentiometer goes to -5V.
I have two problems with this circuit:
Noise. …
- 847
3
votes
1
answer
3k
views
How do I calculate the DC blocking capacitor at the output of a transistor amplifier?
Suppose this circuit of an audio amplifier:
How is C calculated?
I suppose C is there to block DC, so it is a high pass filter. …
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2
votes
2
answers
322
views
What is the impedance of this Common Emitter transistor
I see this question on EE but the other question is slightly different of what I am asking.
Suppose this circuit:
Suppose I will add a capacitor to the input but I need to calculate the input impe …
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0
votes
2
answers
205
views
This is something I do not understand correctly about transistor polarization
Suppose the following audio amplifier configuration:
Suppose that Vc is correctly configured to be in the middle of the rail.
So, at rest, Vc = 4.5V, Ve = 0 and Vb = 0,6V, right? … In my mind, as the transistor cuts off, Vc will be 9V but this circuit is mentioned on the web as being an amplifier. It seem to me more like a half cycle rectifier...
What am I missing? …
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0
votes
1
answer
113
views
Getting rid of charge injection click and hum sound on this switch I have designed
I have designed this 4 stereo channel TRS switch.
You have 4 channel stereo input and 1 stereo channel out. You press a button and you switch which channel you want to send to the output. Once the …
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0
votes
2
answers
260
views
A question about impedance on a multiplexer
I have designed this audio multiplexer
This is a 4 input TRRS audio switcher. Remember TRRS (4 pins: mic, left, right and ground).
I press a button and I change the input that I want to send to th …
- 847
0
votes
2
answers
154
views
Help me understand what happens with the circuit when an AC signal is applied
Consider this circuit.
Transistor is 2N2222A. Ic is chosen to be 10 mA.
Hfe is 225 for that current.
Resistors are calculated to have Vbe = 0.7V and Vc = 4.5V.
I am trying to understand what happe …
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