Re: [TCML] Variac Phase Shifting Info please

[Gary Lau <glau1024@xxxxxxxxx>]

Hi Paul,

I use a small Teletype motor that's probably comparable size-wise to your
motor.  I use a 2 Amp Variac to vary the phase, with a 40uF cap.  I don't
think your use of a stepdown transformer changes anything, but I would
place the Variac/cap in the 120V circuit.  The resistor is only there to
bleed down any residual charge in the cap for personal safety, should some
bizarre failure mode occur.  The exact value is not important and does not
affect the operation of the circuit.  My SRSG web page with schematic is at
http://www.laushaus.com/tesla/sync_gap.htm

Regards, Gary Lau
MA, USA

On Wed, Jan 18, 2012 at 5:16 AM, Paul Walsh <jam.jar@xxxxxxxxxxx> wrote:

>
> HiI am building my first TC and need some help. Have decided to use a
> variac for phase shifting. I've seen quite a few circuit diagrams to point
> me in the right direction, problem is  I am using a 110v 1/20hp 7.5W
> oriental motor for the SRSG and have a 230 to 110v transformer mounted next
> to it in the TC base. I been told I can still use a variac to phase shift
> in the 230v supply to the step-down transformer but I am unsure of the
> position of the cap and resistor needed in the circuit. I haven't purchased
> the variac for phase shifting yet and have been told these small motors
> will only need a small size 1.5A or so. If some one could help with a
> circuit diagram and component values I would be very grateful.
> Thanks
> Paul
>  _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla