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Open Source Micro Cassette Player

It wont look like the elbow elbow cassette player (different)

Ricardo FerroRicardo Ferro
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  • Logs 12
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  • Discussion 6
  • The 2017 Hackaday Prize
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  • Ricardo FerroRicardo Ferro

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This project is submitted for

  • The 2017 Hackaday Prize
  • Internet of Useful Things

This project was created on 05/08/2017 and last updated 7 months ago.

Description

I saw the concept art on a website called the Verge, and decided that ill build by own, and open source it .

https://www.vcalc.com/wiki/vCalc/Belt+Pulley+RPMs

If anyone wants to join the project, send a request or help via comments below or chatlogs.

Project Logs
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  • captains log 13

    Ricardo Ferro • 10/20/2017 at 04:03 • 1 comment

    Im not dead, im assembling it and testing it with the ocilloscope, to make eveything alot easier and cheaper, ill just use the power source as a 5V which any home charger can handle.

  • log11

    Ricardo Ferro • 07/16/2017 at 04:25 • 0 comments

  • Captains Log #8 or 10

    Ricardo Ferro • 06/25/2017 at 14:55 • 0 comments

    designing the tape head pcb

  • Captains Log #9

    Ricardo Ferro • 06/18/2017 at 14:29 • 0 comments

    got the motor in the mail !

  • Captains Log #8

    Ricardo Ferro • 06/04/2017 at 17:49 • 0 comments

    Hey everyone, I took a different approach to the cassette tape speed and I found an alternative motor for driving cassette tape. I did simulations to play the cassette tape and the rpm varies between 20-50 rpm. The motor is small which is good becauseit keeps the small form factor.

  • Captains Log #7

    Ricardo Ferro • 06/02/2017 at 13:46 • 0 comments

    Small change on Distributor to Wuhan P&S

  • Captains Log #6

    Ricardo Ferro • 06/01/2017 at 16:57 • 0 comments

    Ok i'm just ordering parts for measuring RPM from EMF. Based off the overall project I think only an arduino pro mini or teensy might be used. Thats good because the cost to build this thing will dramatically decrease.

  • Captains Log #5

    Ricardo Ferro • 05/31/2017 at 17:05 • 0 comments

    I just received 5PC pkg today. I'm just waiting on the giant book of resistors/caps to come in the mail next week.

  • Captains Log #4 RPM

    Ricardo Ferro • 05/11/2017 at 06:35 • 0 comments

    The tape has to move at a constant 4.76cm/s rate. Based off the protoype design it didn't include the tachometer to measure the linear speed.

    Im going to list 3 ways it may play correctly

    1. No tachometer, uses a microcomputer for reading the cassette tape and use software to stabilize the changing play speed
    2. Add a tachometer to read the 4,76cm/rate but the design becomes bulkier with extra parts.
    3. We discover a new way to play a cassette tape at the right speed somehow.


  • Captains Log #3

    Ricardo Ferro • 05/10/2017 at 06:09 • 0 comments

    Thanks to @Morning.Star for recommending a pre-amp for the Casette Tape Head. A Youtube video a google search later

    http://piperidis.smartdev.gr/MyWebPage/Contructions/Amplifiers/tapeplayer/tapeplayerEN.htm

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freezedream wrote 06/02/2017 at 04:41 • point

Very cool nascent project. Looking forward to seeing how things progress!

  Are you sure? yes | no

Ricardo Ferro wrote 06/27/2017 at 23:05 • point

thank you! ill update the progress in a few days

  Are you sure? yes | no

K.C. Lee wrote 05/11/2017 at 18:08 • point

@Morning.Star Microchip TC652 uses FanSense(tm) to sense commutation of a DC brushless fan.  They basically AC couple the current signal from a sensing resistor. 

  Are you sure? yes | no

Martin wrote 05/11/2017 at 08:58 • point

The speed is (was) normally stabilized without a tachometer, except in high class tape decks. Often analog motor control chips were used which evaluate back EMF of the motor and/or implement some kind of "negative resistance" to compensate for the rotor resistance. Without this resistance the moor speed would be perfectly proportional to the applied voltage, independent of mechanical load.

Sometimes such a control circuit was included into the motor casing.

Another possibility would be a brushless motor, where you get inherently a frequency proportional to it's speed. This can also done sensorless by evaluating back EMF of the winding which is not driven at the moment.

  Are you sure? yes | no

Ricardo Ferro wrote 05/11/2017 at 16:02 • point

Thanks for the insite I will have to do research into back EMF, and the different possibilities including some that you suggested/.

https://www.precisionmicrodrives.com/application-notes/ab-021-measuring-rpm-from-back-emf

  Are you sure? yes | no

Morning.Star wrote 05/11/2017 at 16:52 • point

We meet again lol

hackaday.io/project/20876-origaime-cardware-bis/log/59055-skunkworks

right at the bottom...

Except my motor has a commutator. I was thinking of sampling the feed and counting the EMF spikes for metrics as a free replacement for encoder wheels etc, but I'd never heard of it being done. Damn, but at least I know it works. :-)

  Are you sure? yes | no

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