All Questions
Tagged with audio transistors
109
questions
1
vote
2
answers
86
views
Disabling microphone when secondary one is connected
I'd like to add a 3.5 mm female jack to this circuit so that I can add a better external microphone while keeping the internal one for convenience. What would the circuit look like?
Putting both ...
- 11
1
vote
2
answers
69
views
Switching between audio sources with transistors. Mimicking a SPDT switch
I have what I hope to be a really simple question I have to ask now as it stopping me sleeping lol.
I’ve added Bluetooth to a 1950s car radio, using 2 SPDT switches (one could be replaced with SPST ...
- 13
3
votes
1
answer
2k
views
What is the difference between using transistors and op-amps in pre-amplifiers? [closed]
What is the difference between using transistors and op-amps in the design of audio preamps? What are the advantages and disadvantages of using each?
Based on my research, using op-amps is better as ...
- 41
4
votes
2
answers
2k
views
Creating a 3.3 V audio amplifier using an NPN 2N2222 transistor
It has been way too long since I did anything with transistor amplifiers. I am trying to find an example of a 3.3 V NPN transistor amplifier preferably based around a 2N2222 transistor. I have lost ...
- 75
0
votes
1
answer
248
views
How can I use smartphone aux / headphone jack to trigger a MOSFET?
I am working on a security project in which in case of any emergency my smartphone triggers an alarm or sound. This sound is in the form of audio by phone smartphones. When I connect earphone jacks, ...
1
vote
1
answer
266
views
Mono audio amplifier repair help (Harman Kardon HK775): resistors getting hot
I acquired an excellent vintage amplifier and started the journey of giving it a new life. I have managed to repair most of the damage and have come to a working device.
But there is one problem still ...
- 91
1
vote
1
answer
407
views
Single transistor VCA for gate type CV signals
I am in the process of designing a sort of mini synth / noise machine and I'm struggling with the output stage. I only want sound to come out when I press the button, so based on some designs I have ...
- 127
0
votes
5
answers
351
views
How to decrease distortion and efficiency of this circuit?
How to achieve efficiency of more than 70% and decrease the distortion of the circuit to 0.1% in THD, without affecting my Vpp=30 with the circuit below with both in 1k and 6k frequency of Vs?
Update
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- 129
0
votes
1
answer
552
views
Designing a two stage push-pull class B audio amplifier
I am designing a two stage push-pull class B audio amplifier with s 2N4401 used as my pte-amplifier stage and TIP31C & TIP32C as my push-pull stage where my RL is a 10W speaker.
I am trying to set ...
- 129
1
vote
2
answers
1k
views
Designing an audio amplifier with push-pull output stage
I'm working on a push-pull stage audio amplifier. I'd like your opinion on whether I'm on the right track with this, both theoretically and practically.
In this circuit I'll be using the following ...
- 129
0
votes
1
answer
170
views
Transistor for Signal Attenuation
I've been considering a circuit that could be used as an equalizer for an audio signal. Specifically, I'm planning on using a set of filters (a cross-over) to split the input into respective channels,...
- 125
-3
votes
2
answers
324
views
Designing a 500 mW audio amplifier
I have to design an audio amplifier to drive 500 mW 8 ohm load. I used two SMD transistors (BCP54 NPN and BCP51 PNP) and three BC847Bs, one to drive the BCP transistors, one for voltage gain, and one ...
- 193
1
vote
1
answer
374
views
BJT Amplifier Simulation
I am trying to build a simple CE amplifier for an AM signal as part of a home-brewed transistor radio. I would like to have a working simulation before I get a breadboard. My simulation works in small ...
- 570
1
vote
1
answer
244
views
Electret microphone: convert sound to current or resistance?
See this picture (from Wikipedia):
The electret microphone consists of a capacitor with a static charge and a JFET. I wonder how the electrical signal relates to the sound signal.
I understand that ...
- 1,424
-3
votes
1
answer
3k
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Why are MOSFETs good for audio output?
As title.
I read some articles that says MOSFETs are good for audio output transistors and that MOSFETs act like tubes in most case.
Here is the article says why it's good:
SCIENTIFIC PUBLICATION
The ...
- 93