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Making an audio transducer with easy to obtain elements? Answered

I have any old longplays, and I wish converts them to MP3. I have too an old turntable, but it lacks the pick-up. I think that perhaps from a pair of headphones, a transducer can be manufactured. Someone can give me some suggestion?



Hi Rimar I think the best way to source a replacement needle or your phono is to go to a music store and by that I mean a musical instrument store. The guys who make rap music and urban style and DJ music still use a decent (not great) phono cartridge for making their music. I think the fidelity will be better then anything homemade and most likely less damaging to the record itself. The preamp that the other person has mentioned would be needed as well to boost the signal for the audio in on your computer. Hope that helps.

Thanks, WhistlePig. This project is temporarily suspended, but yours suggestions are good.

. The only difference between recording from a turntable and, say, a tape deck or CD player, is that you need an RIAA equalizer and a preamp. The eq/preamp is built into the phono input of receivers, but, as you've noticed, few receivers come with phono inputs nowadays. If you have a receiver with a phono input and a line level (1VP-P) output, you can use it to drive the line level input on your computer.
. If you don't have an "old" receiver, the preamp is easy to find and fairly cheap (or build it yourself - ~10uV -> 1VP-P), but the RIAA eq tends to be a little pricey. I found a (free) software RIAA filter about six months ago, but don't seem to be able to find the web page (or the d/l'd filter) now. For old-guy-ears like you and I have, you can configure a decent RIAA curve with a 8+ band equalizer.
. Once you have all the hardware hooked up, fire up your favorite audio recording app, set the levels, and click Record. Digital recording is much more sensitive to clipping than tape, so try not to light the peak indicators.
. Googling ripping LPs turns up a LOT of good info on the details.
. Using an "old" receiver (with phono input), or one of the newer digital turntables would probably be the best solutions. The turntables have gotten almost cheap in the last year.

Audacity has a RIAA eq function (equalize, then select RIAA curve.)

It's destructive, of course. Still, with a decent sound card, it might do the trick...

Thanks by the comment. But before thinking on the equalization, I must make the transductor.

Thanks by the comment. I will see that link. I Don't know enough electronic.

Thanks by the comment. I will see that link.

. If you want to do the least amount of damage during playback, do NOT use a DIY "needle." LPs are made from PVC which is soft and can be easily scratched or deformed. Plus the fidelity will be horrible. Spend a few bucks/francs/euros on a decent phono cartridge. . Another alternative would be to buy one of the new turntables with built-in digitizers. Google "digital turntable" or "USB turntable". I haven't used one, but the reviews for most of the newer ones are good. As soon as I get my Mustang back on the road, I plan on getting one and ripping some of my 2000+ LPs.

Thanks by the comment. I promise to be very careful with the LPs. I live in Argentina, here there are not these new turntables.

First thoughts - glue a needle directly to the diaphragm of a single headphone speaker, fix the speaker to the arm of the turntable, connect the wires of the speaker to an amplifier. Like this:

speaker idea.jpg

I already began to do something seemed to this in BOTH headphones. Previously I verified that the frontal entrance for microphone in the PC is stereo and reproduces the sound of each headphone on the corresponding loudspeaker. If I achieve somewhat acceptable I will publish an instructable. Thanks by the comment.