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Ben Heck’s Mechanical Television Part 2 Episode -- Episode 233

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element14's The Ben Heck Show

Join the Ben Heck team every week for amazing hacks! Watch them build and mod community-inspired projects using electronics!

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In this episode Ben continues to make a mechanical television using old records, a flash light, a drill motor and some Photoresistors.

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  • Please revisit!!

     

    1. Analog brightness signal !!!! The source brightness should directly control the playback light brightness. Simple analog stuff. Get rid of the comparators here.

     

    2. Sync records with some sort of analog encoder, (potentiometer, ideally) so you can get high speed, and absolute positioning.

     

    3. Servo the playback motor so it is in sync with record motor. Simple servo circuit here: If the playback motor is ahead of the record motor, the comparator goes low. If the playback motor is behind the record motor, the comparator goes high.

     

    4. Low pass filter the comparator output, (capacitor in the feedback loop of the comparator) so it becomes a slow moving voltage. Put a high current buffer (power amp...) on the filtered comparator output that directly drives the playback motor. Boom, synchronization!

     

    5. Transmit the record brightness signal and the record encoder position over two AM radio signals. It is TV after all!

     

    OTHER IDEA:

    Instead of a spinning record, use lasers and a XY mirror control, like a barcode scanner. Use the mirrors from a laser printer or barcode scanner? Way better resolution. LASER TV!!!

Comment

  • Please revisit!!

     

    1. Analog brightness signal !!!! The source brightness should directly control the playback light brightness. Simple analog stuff. Get rid of the comparators here.

     

    2. Sync records with some sort of analog encoder, (potentiometer, ideally) so you can get high speed, and absolute positioning.

     

    3. Servo the playback motor so it is in sync with record motor. Simple servo circuit here: If the playback motor is ahead of the record motor, the comparator goes low. If the playback motor is behind the record motor, the comparator goes high.

     

    4. Low pass filter the comparator output, (capacitor in the feedback loop of the comparator) so it becomes a slow moving voltage. Put a high current buffer (power amp...) on the filtered comparator output that directly drives the playback motor. Boom, synchronization!

     

    5. Transmit the record brightness signal and the record encoder position over two AM radio signals. It is TV after all!

     

    OTHER IDEA:

    Instead of a spinning record, use lasers and a XY mirror control, like a barcode scanner. Use the mirrors from a laser printer or barcode scanner? Way better resolution. LASER TV!!!

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