All Questions
24 questions
-2
votes
0
answers
40
views
Challenge- Starter Pistol to close contact on Timer remotely [closed]
Track Coach here.... My school still uses an Ultrak L10 to time meets and I am looking for a way to DIY a solution to simplify and standardize the start of a race. Currently we just have the "...
0
votes
1
answer
53
views
Rebuilding an Old Transistor Radio into a Bluetooth Speaker
I recently acquired an old transistor radio and I'm interested in transforming it into a Bluetooth speaker. I'm considering using a stereo amplifier kit that includes built-in Bluetooth, such as this ...
- 339
-3
votes
2
answers
64
views
Double audio output
simulate this circuit – Schematic created using CircuitLab
Hello
i am trying to have the same audio play on two usb earphones, i have tryed multiple adapters but nothing work, the software force ...
3
votes
1
answer
493
views
Why am I not getting an output from this breadboarded phaser?
After following along with a hobbyist's video, I breadboarded a phaser. Unfortunately it seems my circuit is not achieving anything close to what the hobbyist achieved with his.
I believe the issue is ...
1
vote
1
answer
198
views
Is there a momentary switch that cuts the signal only the very instant it is pressed?
I am trying to build a guitar kill switch that would behave like a typical momentary switch, but with a twist: I would like the audio signal to be interrupted only the very moment I press the button (...
- 11
0
votes
0
answers
91
views
Convert a 5 pin Elno connector to a 3 pin XLR
I'm trying to modify a Elno laryngophone's connector (5 pin) to plug like a normal mic so I need to understand how to wire cable to a standard XLR connector, maybe somebody knows how to do? thank you
0
votes
1
answer
98
views
Electric guitar with active electronics and a DIY battery gauge
There is a primitive DIY battery charge monitor which blinks a LED after input voltage drops lower a certain level. Let's call it battery gauge. Also, there is an electric guitar with active ...
- 101
1
vote
1
answer
189
views
Make a doorbell louder? Bypassing in-built amplifier
I have a doorbell I'd like to make louder (existing speaker driver is ~2W).
I had an idea of intercepting the signal going into (or out of?) the amplifier chip and feeding those signals through a ...
- 11
0
votes
1
answer
183
views
What is the maximum voltage and current audio sockets of a phone can withstand without damaging the phone?
I want to make an oscilloscope which can measure signals of any voltage upto 50V. Is it possible to make a circuit which can do this safely without damaging my smartphone?
0
votes
1
answer
99
views
Building a voltage adjuster circuit
I've been trying to build an op amp circuit that takes an analog signal from my electric guitar of around -1.5 to 1.5 V to a voltage level of 0 to 5 V, so that I can put it into the ADC of a ...
- 143
0
votes
2
answers
237
views
Connecting Headphone to Phone and Laptop via Switch
I am trying to build a small circuit which will connect my phone, laptop and headset with a switch.
So in state 1, the headphone and phone will be connected
and in state 2, the headphone and laptop ...
2
votes
1
answer
621
views
Guitar pedal works by itself but not in a signal chain
I just built a clone of an LPB-1 pedal, as my first ever guitar pedal project. It works great between my guitar and amp with no other pedals in the chain. When it is placed in a chain with pedals ...
- 21
0
votes
2
answers
3k
views
Why are resistors necessary in a summing audio circuit?
I am researching DIY stereo audio mixers (2 input, 1 out) -- there's lots of info out there -- but all the passive solutions (e.g., DIY Multi-Input Audio) include resistors, and I don't understand why ...
- 103
1
vote
0
answers
175
views
DIY high fidelity audio using delta sigma adc
This question may be too general, but I will include all the details that I can. My end goal is to achieve a super high-resolution spectrogram of any recording I choose to make. By doing some tests I ...
0
votes
1
answer
489
views
How to measure the output impedance of a valve preamp?
I was trying to measure the output impedance of a DIY preamp for the past couple of days without any luck. Each time, I got to the same result of around 3K3 ohm, which is unbelievably low.
This is ...
- 1
-1
votes
1
answer
250
views
DIY TDA2822N computer microphone
I am using the following circuit to make a computer microphone.
The "speaker" component is the computer's microphone input. The problem with this circuit is that somehow I can hear capacitors ...
0
votes
2
answers
1k
views
Female mono jack connector 6.3mm
I'm building a DIY pedal effect for my electric guitar and I have to connect the input and output jack connector, but I don't know how to do it. The connectors have 3 pins, one is the tip which it is ...
- 382
1
vote
1
answer
170
views
AUX input outputting +4v Causing reset of connected smartphone
I've added an AUX input to my Mercedes Audio 10 casette radio using an online tutorial. Essentially hooking up a 3.5mm jack direct to the output of the audio processor.
I'm familar with this ...
- 13
1
vote
1
answer
4k
views
DIY car audio noise when the source device is charging from the same power source
I have a hobby in electrical engineering so I built my own car audio system given the fact that it didn't have any before. It's basically two pairs of PC speakers adapted with some resistors and ...
- 79
1
vote
3
answers
8k
views
DIY Multi-Input Audio
Edited, see bottom of this post.
What would be the best method for preventing damage to multiple audio input devices that are connected to a home made audio patch panel?
Im wanting to make a device ...
- 11
5
votes
1
answer
26k
views
Making a [4-Pole TRRS to 3.5mm Stereo & Mic Adapter (Male to 2x Female)] from an iphone headphone splitter jack?
I want an adapter that merges the microphone and earphone 3.5 mm jacks into a single 3.5 mm jack ( basically I want to build the blue adapter thingy):
I have an earphone splitter for iphones that has ...
- 382
0
votes
1
answer
162
views
Using european telephone cables for own DC power delivery
I have european telephone cables running through my walls to each room, without any connection/socket. Well... we really do not need any hard line telephone connection and I am into DIY projects, so I ...
- 275
2
votes
2
answers
362
views
Google Glass 3.5mm jack with battery neck strap
I'm thinking of improving my Google Glass by DIY building a micro usb to 3.5mm headphone jack with a battery connected to a neck strap out of parts from the internet.
I've already built the neck ...
- 53
-4
votes
1
answer
117
views
DIY headphone preamp [closed]
I would like to make an amplifier with following specs:
input from TV RCA jack
output 1-2 3.5mm jacks
powered by USB
volume control (if possible make it somehow wireless)
As i am new to electrical ...
- 93