[sdiy] Re: [OT] technics 1200 - backwards

[Trevor Page]

Instead of mounting a switch to the chassis somehow, another way would be to
make it so that quickly tapping the start / stop button twice will put it
into reverse. I think there's a 'commercial' modification where they
actually do it like this. Dead easy if you use some logic (or PIC or AVR) I
would have thought, and saves doing any drilling to the case (which I most
certainly couldn't bear to do to my lovely silver SL1200's! ;-)

How about putting a two-colour LED inside the strobe lamp, which changes
from green to red etc. depending on direction?

Probably a bit advanced for, uh, 'benders' but interesting anyhow.

Trev

----- Original Message -----
From: "Atom 'Smasher'" <atom at suspicious.org>
To: <benders at yahoogroups.com>; <synth-diy at dropmix.xs4all.nl>;
<digitalhell at resrocket.com>
Sent: Sunday, April 07, 2002 9:13 AM
Subject: [sdiy] technics 1200 - backwards


> cross-posted
>
> this has been asked on the circuit-benders list, but i think it's of
> interest to the DH and DIY crowd as well.
>
> this was tested on an SL-1200mkII, but should work the same on the
> SL-1200mk3 and the 1210 (black) versions, too.
>
> to make a 1200 spin backwards, remove the cover, underneath the
> platter: find IC101 (AN6675) which has a heat-sink on top of it.
>
> wire up pin #8, through a SPST switch, to ground. (a good ground happens
> to be the jumper, next to pins 12-13 of IC101)
>
> if the switch is open, the platter spins forward, as normal. if the switch
> is closed (and pin #8 is grounded), the platter spins backwards.
>
> where you put the switch is your problem.... it looks like there is a good
> spot between the pitch-fader and the platter. i'm gonna use a panel-mount
> push-button switch that mounts in a round hole. if you come up with
> something better, let us know. make sure you remove the HARD plastic
> bottom from the metal upper-housing, and locate a cavity BEFORE you drill
> a hole in the upper-housing.
>
> i was thinking that it'd be cool to use an LED lighted switch, to indicate
> that the platter is in reverse mode, but the shorted-circuit (on the deck
> i tested this on) only pulls 0.28 mA, not nearly enough to light up an LED
> by itself. if someone is really motivated, they can use a DPST lighted
> switch (and wire up an LED), so one of the poles controls an LED.
>
>
>         ...atom
>
> ----------------Void-If-Detached----------------
> http://smasher.suspicious.org/fs1r  Yamaha FS1R
>
> "The Matrix is a system, Neo. That system is our enemy.
> And when you're inside, and look around, what do you see?
> Businessmen. Teachers. Lawyers. Carpenters.
> The very minds of the people we are trying to save.
> But, until we do, these people are still a part of that
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> understand: Most of these people are not ready to be
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> dependent on the system, that they will fight to protect it.
> -- Morpheus, 'The Matrix'
>
>
>