Servos, mounting brackets, extension cables, Y cables and reversers and parts to make working with servos easier.
May not be exactly as pictured. Penny for comparison, not included.
Miniature Servo (SG90) Subminiature 9g servo. These have plenty of power for hinged point turnouts and smaller rail (code 55 and smaller) solid point turnouts - if used with the servo mounting kit (SMK002 below) it can handle higher loads, up to code 100 non-hinged rail. If the point rails are hinged then the rail size is not an issue - it has been used up to G scale. Our servo brackets (see below) are custom made to fit these servos. Size 1.25" wide (including mounting tabs) x 0.5" deep x 1.125" tall. Servo lead about 7". The label on the servo and the lead colors may vary between batches. Works with all of our boards. Every servo is tested before shipping.
Qty 1-3 $4.99USD
Qty 4-7 $4.50USD
Qty 8+ $4.25USD
SwitchWright Servo Bracket
Assembled SwitchWright laser-cut from aircraft grade spruce plywood
These 2 images illustrate the amount throw available.
SwitchWright Miniature Servo Bracket Kit (servo not included) The SwitchWright is a newly designed servo bracket made out of laser-cut aircraft-grade plywood to make it rigid and durable. It holds the servo securely with two screws. The kit comes with everything you need - the mount, the wire, mounting screws for the servo and for mounting the bracket to the layout. We also include a piece of double-sided foam tape for holding the bracket in place until you can get the mounting screws in place.
Actuating Wire- .032" steel music wire. Length - 5" before assembly; 3" usable length after assembly (maximum thickness of subroadbed + track height)
Bracket Size - 1.97" wide x 1.138" deep X 1.0" high
Fits servo size 0,87" (22mm) wide x .47" (12mm) deep (SG90, 9g servos).
Minimum mounting clearance under layout - 1.375"
Mounting Screws - #6 x 1/2" for bracket to layout; #2 x 5/16" for servo to bracket
Note: May come packaged 2 per package to save space when you order several.
SWR001 $5.95 USD
Qty 4-11 $5.35 USD
Qty 12+ $4.75 USD
SwitchWright Bracket Wood Parts Only Kit
Just the laser-cut wood parts needed for a SwitchWright servo bracket. You supply the wire, foam tape, screws and servo as you desire.
WPK001 $4.75 USD
Qty 4-11 $4.25
Qty 12+ $3.80
Assembled Switch Machines
The Micro Switch Machine is a small servo-based switch machine with a built-in snap switch. It is 1.25 inches wide and 1.5 inches tall. It is ideal for N scale installations yet has enough torque to throw O scale turnouts. It comes completely assembled.
Micro Switch Machine w/ Snap Switch
The Micro Switch Machine is based on the SG90 servo with a 5 Amp rated snap switch mounted so that it is turned on and off at half throw - ideal for powering frogs. The wire actuator is already mounted for you. The Micro Switch Machine is ready to go. Comes with a piece of double-sided foam tape for ease of mounting as well as 3 #4x1/2" screws for permanent mounting. Use with any of your servo decoders to power a turnout and the contacts provide frog power.
MSW001 $15.95 USD
Qty 6+ $12.76
Micro Switch Machine (without Snap Switch)
The Micro Switch Machine is based on the SG90 servo. This version does not have the snap switch mounted saving you money if you have another way to power the frog or you don't need powered frogs. The wire actuator is already mounted for you. The Micro Switch Machine is ready to go. Comes with a piece of double-sided foam tape for ease of mounting as well as 3 #4x1/2" screws for permanent mounting. Use with any of your servo decoders to power a turnout.
MSW002 $11.95 USD
Qty 6+ $9.56
Shown with the battery cover off. Servo plugs in to yellow board at right. Use an extension cable to extend the length of the cord.
Servo Centering Tool
Use this handy portable tool to keep your servos centered while you mount them under the layout. The tool consists of a battery box connected to a small circuit board that continuously puts out a centering signal for the servo (1.5 ms pulse). Keeping your servos porperly centered while mounting is the key to making the servos work best. The battery box has an on/off switch to save your batteries when not in use. Everyone using servos for turnouts needs one of these.
Requires 3 AA batteries.
SRC001 $12.95 USD
In-Line Servo Reverser
You can often reverse your servo throw direction by turning it around or reversing the servo linkage. Sometimes there just isn't room under a turnout to do this. You can't reverse the servo direction by swapping wires since servos work by varying the pulse width and reversing the wires will just disconnect off the servo. In cases where you want to reverse the servo rotation direction, this servo reverser comes in handy. If you put this in line with the servo it will swap the two ends about the center. [It works by mirroring the pulse around 1.5 ms which is the center on a servo. I.e. if a 2 ms pulse is input, the reverser will output 1 ms and if a 1 ms pulse is input it will output a 2ms pulse.]
SRR001 $4.95 USD
No-Buzz In-Line Servo Quieter
Sometimes a servo will buzz or chatter continuously. Some poeple find this very annoying. The No-Buzz goes in line with the servo cord and quiets the servo. Here is how it works - if the servo is stopped in the same position for more than about a second the circuit turns off the servo. If the servo starts moving again it will turn it on and drive the servo until it stops again. When the servo is stopped the gears will hold most switches in place. If you use the SwitchWright geometry then the wire acts as a over-the-center spring and also holds the points while the servo is off. A side benefit of the No-Buzz is that you do not need to adjust the servo as precisely but can overdrive the position and let the servo relax back after it turns off.
NBZ001 $4.95 USD
How to install In-line Reverser and No-Buzz
Install the units as in the picture to the left. The white wires on both sides go to the side marked S (for signal - on some servos this wire is yellow). The right side with the pins go to the servo and the left side with the female plug goes to the board. You can plug the unit directly in to the board or use a servo extension.
Servo Extension Cables
These are used to put the servo farther away from the board. They daisy-chain together to form as long a cable as needed.
How many of these can you daisy chain together? In an experiment I daisy-chained 15 extensions and found that the servo still worked OK. At 20 extensions, the servo threw but could not hold against back-pressure. So I would say up to 15 40# extensions is the limit - that's 50 feet.
They are also available from a number of sources including R/C stores. You can find some good deals on Ebay from suppliers in Taiwan.
12" (30cm) Servo Extension Cable (Set of 10)
3-wire servo extension cable 12" (30cm) long, 24 AWG stranded wire. Added to the 12" cord that comes with most standard size servos you can power a switch up to 2 feet from an Octopus or Quad Servo board. Set of 10 cables.
SRX112 $15.00 USD
(Set of 10)
Set of 10 40" (100cm) Servo Extension Cable
24 AWG 3-wire servo extension cable. Set of 10 40" extension cables.
SRX140 $30.00 USD
(Set of 10)
Y servo extension Y cables are used to attach two servos to one output. Both servos will move in the same manner at the same time. Could be used, for example, to control a crossover or a passing siding. Does not affect the servo power. The Y can can also be used with the fascia controllers for the Quad-Pic to provide two control points for one switch. Use one for a pair of servos and one for a controller at the same time and you can set up a passing siding with control points at both ends!
They are also available from a number of sources - R/C stores. You can find some good deals on Ebay from suppliers in Taiwan.
12" Y-cord Y cables are used to attach two servos to one output. Both servos will move in the same manner at the same time. Could be used, for example, to control a crossover or a passing siding. Does not affect the servo power. The Y can can also be used with the fascia controllers for the Quad-Pic to provide two control points for one switch. Use one for a pair of servos and one for a controller at the same time and you can set up a passing siding with control points at both ends!
SRX003 $2.75 USD
Extra Programming Jumpers (Shunts) (Set of 10)
Most of our boards come with enough jumpers for normal use. However, these little guys have a way of disappearing and so customers often need more so we are now offering this small 10-pack for your convenience.
JMP001 $2.95 USD
(Set of 10)
Other useful Items not sold by Tam Valley Depot
Standard Size Servo
We recommend Hitec HS-311 servos as the best value for the money in a standard size. They are tough, powerful and inexpensive. We no longer carry them but there are several good sources of these on the web. A standard size servo might be better for an animation project. However, for turnouts, the miniatures plus mounting kit have plenty of power.
These make really handy servo mounts when you want to mount the servo driving semaphores, animation and so forth. Digi-Key (www.digikey.com) sells them as item 612K-ND (BRACKET RT ANG MOUNT 4-40 STEEL). The matching 5/16" 4-40 machine screw is H704-ND.
Some random sources
Power supplies and toggle switches are available at www.MPJA.com
Pololu.com has a lot of neat connectors and pre-crimped wires for making cables that fit the 0.1" pins on our boards.