[sdiy] technics 1200 - backwards

[mark verbos]

yeah you open up the case and turn up the range trimpot.

;)

it's under the platter.

people do that one all the time, but then it becomes really hard to mix 
on them, because the slide is too sensitive.

mark

Doug Terrebonne wrote:

>Is there a mod to increase the range of the pitch control? Something like +/-
>50% would be great!
>
>Doug
>
>--- Atom 'Smasher' <atom at suspicious.org> wrote:
>
>>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
>>
>
>
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