34 lines
1.8 KiB
Markdown
34 lines
1.8 KiB
Markdown
# Tapedeck Player
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Replace the old electronics of your tapedeck with an mp3 player, all while keeping the retro controls working!
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## Hardware
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- Tapedeck. Anything will do, I used a [Universum Cassetten Recorder - Stereo Tape Deck CT 2746](https://www.radiomuseum.org/r/quelle_ct2746.html) from 1974.
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- Arduino
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- [DFPlayer Mini MP3 Player](https://wiki.dfrobot.com/DFPlayer_Mini_SKU_DFR0299) with an SD card
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- OLED Display. I used a 1.3" I2C display, 128x64 pixels, SH1106 controller.
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- audio amplifier to drive the speaker
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- one microswitch to detect the fast-forward button being pressed
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I reused a lot of the original components from the tapedeck (including wires), namely the user-facing electronics: volume and bass/treble potentiometers, mode-select switches, lights, speaker, power-on switch, audio input/output DIN connectors. And of course the tape motor.
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## How This Works
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Everything gets powered when a button on the cassette drive is pressed, activating the motor among other things. After the Arduino and the MP3 player boots (after a few seconds), the OLED display activates and the music starts. When the player is stopped, power is cut and the whole device is truly off.
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Every power-on is a fresh boot for the MCU. Therefore it keeps track of what song to play in its EEPROM; whenever a song finishes, the song index is increased and stored.
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The Fast-Forward button has a microswitch that tells the MCU to only play a short beginning of each song, skipping through them quickly.
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The OLED display shows the song time, song index and the number of songs on the SD card.
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The volume potentiometer controls the volume (gain) on the audio amplifier.
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The MCU scans the tone potentiometer and changes the equalizer preset on the MP3 player: BASS, NORMAL, POP.
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The "chrome cassette" switch overrides the selected equalizer ROCK.
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