Skill Level: Intermediate to control from pushbuttons to Advanced to connect to a signal system.
Features
Control two servos independently with 3 positions each
Speed Controllable from very slow to very fast
Drive circuitry for external LED indicators - common anode OR common cathode
Inputs for momentary pushbuttons
Bounce Simulation - blades bounce at end of throw
Variable Bounce Amplitude
DCC accessory decoder built in (can be used with JMRI PanelPro)
Anti-backlash for stub switch center position ensures accurate positioning each time
Time-delay option - simulates a signal system by turning from red to yellow to green with a time delay.
Can be used with most signaling systems such as CMRI or Logicrailtech
This is the Mark III version updated in April 2015. It has a more powerful switching voltage regulator and larger easier to wire terminal blocks on the I/Os. The firmware is identical to Mark II.
(Note: not for 3-way turnouts, more properly known as lap turnouts, which are actually two overlapping but independent turnouts. For those use two servos driven by singlets or half of a quad.)
Tam Valley Depot Dual 3-way is featured in the cover article of the March 2012 Model-Railroad Hobbyist E-zine! I wrote an extensive article on how I installed an operating semaphore on my Donner Summit layout. Download the issue by clicking on the image.
Dual 3-way III
The dual 3-way can be used to control 2 servos with 3 positions each. Typical uses are semaphores and 3-way stub switches. Comes with 2 I/O connectors that are used to connect to your signal system and/or indicator LEDs (or just use DCC).
DTW101 $35.00 USD
Servo is shown for illustration purposes. Kit includes 8 L-brackets and 8 screws
L-bracket Mounting Kit
This is a nice way to mount servos for operating a semaphore blade. The kit works well for both miniature (SG90) and standard size servos. The kit includes (8) 3/8" L-brackets and (8) #4-40x1/4" screws for mounting four servos.
LBR001 $4.95 USD
How to mount your servos to operate a dual-bladed semaphore using the L-brackets. The view is from the bottom below the semaphore. The two actuating wires will come up through the hole to be attached to the servo arms.
Video of the Dual 3-Way on my Donner Summit layout being used to run a lower-quadrant semaphore.
3 -way stub in Rico on Steve Harris' HOn3 Rio Grande Southern.
Here are some shots of the coming Dual 3-Way Servo Driver being used to drive a Tomar upper-quadrant semaphore. The action is controlled by a Logic Rail Tech Signal Animator both of which can be purchased here.
Dual 3-way In Action
Here is a photo sequence showing the Dual 3-Way driving a 3-way stub switch. Thanks to Jason Reis for building the switch for me. The Hex Frog Juicer would be the ideal way to power the 3 frogs.
