Throttle

Overview

The throttle unit consists of a 3D printed assembly on top of a linear potentiometer (variable resistor), and supporting components on a printed circuit board. 

Some additional functionality was not included in the Kickstarter – the PCB allows for some additional components to measure and report air pressure in the tube. Information to achieve this will be released in due course, for the moment ignore this in the photos please.

Instructions

Component	Value	Identifier	Notes
R1	2k2	Red, red, black, brown, brown.	Resistor divider network for switch and variable resistor
R2	1k	Brown, black, black, brown, brown.	Resistor divider network for switch and variable resistor
R3	3k9	Orange, white, black, brown, brown.	Resistor divider network for switch and variable resistor
R4	10k	Brown, black, black, red, brown.	Resistor divider network for switch and variable resistor
4 pin header connector			Connects Throttle to Output board
Slider potentiometer	10k		Note polarity.  The two pins of the potentiometer must be soldered to the end nearest the 4 pin header connector.

Finally, solder the red and green coloured switches in the orientation shown in the main photo.

Mechanical assembly

Slide the potentiometer movement to the centre of its travel.

Insert the M3 nylon nut into the small cavity in the inner top of the throttle shell.  A sharp instrument such as a small screwdriver may be required to clear the area of the 3d printed material prior to inserting the nut. Insert the M3 nylon bolt through the PCB from underneath.    See photo below.

Now position the shell in place over the potentiometer and tighten the nylon bolt into the retaining nut by tightening with a screwdriver from underneath.

Push the throttle handle down onto the potentiometer movement. Note there is a slight angle on one face of the throttle handle – this is designed to face towards to the forward position of the throttle.