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Questions tagged [recording]

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3 votes
1 answer
78 views

Avoid cross talk between recording electrodes

I am trying to compare two record signals coming from two INA amplifiers simultaneously. Both amplifiers are actually recording the same signal, just with different recording electrodes. We are ...
Potatoconomy's user avatar
0 votes
1 answer
44 views

How to power an audio-level meter / VU meter in a midi-controller project?

I'm building an Arduino-based midi fader controller, and want to also add an audio VU / Level Meter to the enclosure. The Arduino is USB-powered. I bought a standalone audio level meter on AliExpress, ...
jimj31's user avatar
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0 votes
1 answer
57 views

Further Electronic aspects of iPhone audio recording via lightning connector

Following on from this post I wired up a way to record audio on an iphone (the important design points quoted here): The iPhone as well as other mobiles will apply a DC voltage about 1.5-2.5V to the ...
mmm's user avatar
  • 1
3 votes
2 answers
302 views

Recording aliased tones on purpose

For research purposes, I am trying to transmit a tone and record it using sub-Nyquist sampling. Via the PC microphone, for instance, I would expect to see the aliasing effect somewhere in the ...
Dannynis's user avatar
9 votes
1 answer
640 views

Why were D/CAS tapes unusable for audio?

D/CAS a.k.a digital cassette was a data storage medium used in streamers. It looked like an audio compact cassette (and was mechanically compatible with tape recorders), but putting a D/CAS cassette ...
DmytroL's user avatar
  • 193
5 votes
1 answer
752 views

What should be the signal levels when recording a tape cassette?

I make a DIY cassette recorder from a cheap cassette player. I successfully made a stereo playback circuit that works with recorded cassettes, but I'm having trouble with recording; after recording, ...
F3RNI's user avatar
  • 131
1 vote
1 answer
296 views

Measuring a 10s waveform with a oscilloscope

I have a MDO3034 oscilloscope which I need to use to measure a waveform for ten seconds. This waveform is a PWM whose duty cycle varies every 0.2ms or so, and restarts itself every ten seconds. I need ...
Wapers's user avatar
  • 41
0 votes
1 answer
47 views

Measuring current usage in a wheelchair power assist device

I am working on wheelchair configuration methods to reduce upper extremity overuse syndrome in daily users. I want to compare two tire types over a course that consists of obstacles that place strain ...
thebanks's user avatar
0 votes
0 answers
285 views

Playback volume from old Sony voice micro cassette recorder is very low

I have an old Sony V.O.R M-529V microcassette recorder. It was found in a box packed away years ago. I put in some fresh batteries and tried to play some old micro cassettes I had, but the play back ...
The_Vintage_Collector's user avatar
1 vote
1 answer
247 views

Is it relatively simple to design an ADC to ADAT interface with only a Toslink port?

For this project (I'm an experienced audio engineer but a relative beginner in electrical engineering) I really want to integrate a simple ADC to ADAT circuit in a patchbay I'm building so that I have ...
Sweet Pazano's user avatar
0 votes
0 answers
59 views

Reducing noise on casette recordings

I found our old casette player and bunch of empty casettes in attic, also they are in excellent situation. I wanted to record a mix tape for nostalgia but there was no aux input, only an old ...
harold.potter's user avatar
13 votes
4 answers
3k views

What is causing this distortion of a pulse wave when recorded to a reel-to-reel tape?

I'm currently trying to record a pulse train used as a tempo clock for music instruments (e.g. output of Korg Volca 'sync out') onto my Fostex M-8 reel-to-reel recorder, with the aims to then ...
Rasmus Källqvist's user avatar
0 votes
1 answer
79 views

Recording model train's sound output

A little backstory for those not in the know. Model trains used to be, for the most part, controlled by varying DC voltage, usually in the 12V range. Over the past 30 years, systems have been ...
TBSD40-2's user avatar
1 vote
3 answers
2k views

Speed up or slow down motor of cassette recorder using a potentiometer

Background: There is a cassette recorder (RadioShack CTR-80A) and its owner would like to have the ability to speed up and slow down the motor to record and play the sound in a distorted way. We've ...
A Small Gruffalo's user avatar
1 vote
1 answer
139 views

What were the transfer curves of major recording technology from Wax cylinders to HiFi electronics? [closed]

I am interested in the evolution of the quality / fidelity of audio recording. Specifically in the actual frequency response curves and dynamics behavior of those technologies, not just rough ideas. ...
user1847129's user avatar
1 vote
2 answers
73 views

Why can mobile microphones handle high noise now?

I'm wondering why mobile microphones can now record just fine in very noisy environments? (like loud rock concerts) when just a few years ago the sound would be cracking so terribly that you could ...
Sebastian Norr's user avatar
1 vote
1 answer
3k views

Convert from line level to mic level, without worsening the sound quality

I have an audio signal coming out from an iPhone which I would like to record in iPad using its mic input. I have tried this with simple resistor divider (and TRS-TRRS connectors), but it seems to ...
Pravi's user avatar
  • 297
3 votes
1 answer
2k views

Dolby HX PRO implementation on existing tape recording deck

I'm experimenting the implementation of Dolby HX PRO's IC into an old stereo Fostex tape deck to improve high frequency and headroom capabilities. HX PRO works as a dynamic processor with the BIAS ...
user199092's user avatar
2 votes
3 answers
1k views

Attenuate 75W speaker to Line-In

I have a 75W amplifier with a 8ohm speaker connected. I need to record the audio from that output, so i was thinking in using a voltage-divider to condition the signal and record it through the Line-...
Gaspar Santamarina's user avatar
2 votes
2 answers
3k views

problem solving: line level to iphone attenuator buzzing sound

I'm trying to use the mic input on my iPhone to record line level audio. I have made a cable with an attenuator as shown in the picture below. Recording from my macbook pro works like a charm (3,5mm ...
Diego's user avatar
  • 21
0 votes
4 answers
353 views

Saving Oscilloscope Traces as Compressed Bitstream

I have been recording the output of a comparator by having its output (essentially a bit stream with 3.3V swing @ ~20 Mbps) terminating in an SMA connector, and connecting that to an oscilloscope (...
varkong's user avatar
  • 53
0 votes
1 answer
117 views

Negative part of Line level audio waveform clamped

Im trying to record output from an old synth chip (YM3812). The output waveform is centered around 2.5V with peaks at approx. 2.5 +- 1.5V. I can easily connect a pc speaker with a TSSR cable to hear ...
tly's user avatar
  • 127
4 votes
6 answers
13k views

Does USB cable quality matters (affects in someway the signal) on audio interface (or DAC)?

I was wondering this for quite a while. Usb cables are purely digital signal so in theory no one should care about its quality if it does the job well and transfer the signal to the end (ones and ...
Giedrius's user avatar
  • 365
0 votes
2 answers
297 views

Remote Playback Device [closed]

I am looking for a small device/system that I can pre record a one or two word message on and play it back with the push of a remote button. Ideally, the remote would have 3-5 buttons for different ...
M. Pfohl's user avatar
0 votes
1 answer
591 views

Record video from webcam w/o microcontroller [closed]

I managed to salvage a webcam from a broken laptop, and I'm looking to use it to record video in a small package to attach to a rocket. However, I need to record the video to some data medium like a ...
CrafterOfWorlds's user avatar
-2 votes
1 answer
2k views

Pic microcontroller voice recording and playback [closed]

I was wondering we can easily interface LCD, led an pot etc but I couldn't find way how to record my different voice strings and playback specific string as per commands that given to pic
user103110's user avatar
0 votes
2 answers
193 views

A problem with line-in hum

I' trying to record guitar using line-in. But there's a noticeable noise in the recordings, and it is present even when guitar is unplugged (only cable is connected). As you can see its clearly mains ...
Lugi's user avatar
  • 113
2 votes
1 answer
126 views

Audio: Microphones and SPL

With a microphone sensitivity of -33dB = 22.4mV/Pa, picking up a conversation (about 60dB SPL), What is the voltage output of the microphone? My concern here is power vs voltage decibel calculations. ...
Flash's user avatar
  • 153
0 votes
4 answers
5k views

How to reduce tape hiss while recording a cassette tape with digital data as source

I bought a few Maxell cassette tapes, a portable Sony cassette tapes recorder (with the possibility to record also from an external microphone: in my case, a jack connected to the PC) and - as already ...
lucia de finetti's user avatar
4 votes
3 answers
3k views

AC-bias in tape heads: could someone explain?

I understand that the purpose of AC-bias is to improve the quality of a tape recording by countering some otherwise adverse physical properties of practical magnetic materials. I've had this ...
Dan's user avatar
  • 508
6 votes
3 answers
3k views

Video Home System (VHS) bandwidth

Standard play VHS video cassette recorders offered only about 3 MHz luminance bandwidth by recording the signal on an FM carrier. What is that carrier frequency? Is it possible to confirm the carrier ...
cuddlyable3's user avatar
-1 votes
1 answer
163 views

How to build a circuit that can record and playback our voice?

I want to build a simple circuit that can record and playback our voice. IC should be small in size and the circuit should never contain any SMD components. Can anybody given any suggestions to build ...
user3580208's user avatar