On Sat, 12 Mar 2016 12:19:34 -0800, John Larkin
wrote:

On Sat, 12 Mar 2016 13:06:27 -0500, legg wrote:

On Sat, 12 Mar 2016 17:37:50 +0000, N_Cook wrote:

On 11/03/2016 21:22, DaveC wrote:
Oh, smarter-than-I people,

http://imgur.com/WPEoOu1

The 2 belt-drive capstan flywheels in an auto-reverse cassette mechanism are
different sizes. (Motor drive pulley will be in the small loop end of the
belt in illustration above.)

How does that result in the same tape speed in both directions?

Confused...


Aiwa AD WX888 , 1997,I worked on once, spindle to one capstan 2.49mm
diameter and the other 2.69mm

Aiwa ADR470, forward flywheel was inside the loop, reverse was outside
the loop. Both always driven. choice of pinch rollers determine
direction. Flywheel diameters compensate for inside/outside belt
diameter. Only speed adjustment was screw-driver inside the motor
housing itself.

Harman Kardon HK300 had a single flyheel, spindle impressed
alternately on fw or rev through a clutch that was always
disintegrating. Same in-the-motor adgustment.

RL

All those mechanical means of reproducing sound - wax disks, tinfoil,
shellac, plastic, wire, tape - were all awful. Chemical photography
was a nuisance, too. Ditto typing and carbon paper.

I can't think of a single method of 'reproducing sound' that doesn't
involve mechanical means.

Sound is a mechanical phenomenon. Humans use flapping meat.

Perhaps you mean recording? No, still mechanical. Storage? Maybe.

Of course, there's nothing mechanical in electronics, is there...

It's the programme material, the idea and its conception that's
important; not the means of conveyance.

RL