All Questions
Tagged with audio circuit-design
79
questions
0
votes
5
answers
97
views
How does one add a volume control to this circuit?
My uneducated guess is to add a potentiometer at R6. Can anyone confirm?
Image courtesy : amplifiercircuit.net
0
votes
0
answers
30
views
Radio mic and speaker as camera mic input
I want to add radio comms to in car action camera audio. I am a total amateur in analog circuits. I understand that i can't just feed headphone out and mic into camera. That will trip PTT (Push-to-...
0
votes
1
answer
61
views
CB style PTT Mics to USB circuit
I need to design a circuit that takes the input from 2 different CB style (4-pin) push-to-talk microphones and pipes them out to USB. CB mics I have confirmed use regular XLR balanced level output. ...
0
votes
0
answers
33
views
Balanced signal path or balanced in-/outputs
I'm planning to build a small device that can accompany my monitor controller in my home studio. The monitor controller is a TC Electronic Monitor Pilot, it has a volume knob and can select between 3 ...
- 101
1
vote
2
answers
61
views
Aluminium electrolytic capacitors in an AC circuit
Looking through the datasheet for the TPA3123D2, I have noticed some confusing symbol usage and positioning. From my understanding, aluminium electrolytic capacitors can only be 'charged' on the ...
- 592
0
votes
2
answers
74
views
Why does RC1 play a role in balancing collector currents?
This image is taken from eCircuit Center, available in the link. In a specific section, the author discusses the function of RC1, mentioning that RC1 helps set Ic1 equal to Ic2.
I initially thought ...
- 240
0
votes
1
answer
71
views
RCA coax end termination
I am building an amplifier that takes in an RCA output from a TV. From my general understanding, RCA coaxial cables typically have an impedance of either 50 Ω or 75 Ω and a small amount of capacitance ...
- 592
0
votes
1
answer
60
views
Sensing plugged in 3.5mm jack with the TRRS contacts
I am using the pictured TRRS connector and want to detect whether a plug is plugged in via the builtin switches (pins 2/3/4). However, the switches seem to be connected to the audio lines as well. ...
- 5
4
votes
2
answers
2k
views
Understanding a Class D amplifier design
I've been trying to build a simple class D amplifier. I've seen through the block diagrams and design considerations online, but recently came across an amplifier design which doesn't seems to fit the ...
- 81
0
votes
1
answer
80
views
Gate switching - Guitar signal gate controlled by another signal
The circuit below is based on a noise gate and a JFET based switching circuits. The idea is to mute the guitar signal when another signal pases certain threshold of volume (like a reversed gate ...
0
votes
0
answers
49
views
circuit for phototransistor sound receiver
I'd like to build a phototransistor receiver. I've tried different sample circuits (I'm not any good in circuit design) and would like to ask for assistance. I am looking for a circuit that is capable ...
1
vote
1
answer
85
views
Should an unused audio input be left floating or connected to GND?
I am designing an audio circuit with multiple signal inputs through a jack connector that may not always be active simultaneously. In this case, is it better to connect them to GND when not in use to ...
- 53
0
votes
1
answer
104
views
Where should the audio-input be available in this RF circuit?
Let me show you what I have tried so far. First of all, the circuit below has been tested and this one works for sure. The audio signal can be heard on an FM radio at 100MHz.
The second below is ...
user321220
1
vote
3
answers
640
views
Audio amplifier design using an amplifier to pick up the microphone output and drive an 8Ω speaker for a 4W output
I am studying analog circuits and see a problem in my textbook (Sedra.)
In the problem, I want to make an audio amplifier to pick up the microphone output and drive an 8Ω speaker for a 4W output.
In ...
- 11
1
vote
1
answer
176
views
Designing a circuit with a LM386 amplifier
I'm designing a circuit an I want to use the LM386 audio amplifier. Before designing, I'm going through the whole datasheet, I've seen that VI is from -0.4V to 0.4V :
Here is the first typical ...
- 55