As part of our review into the product ranges we stock, this engine sound unit is no longer available from Technobots. We have been the retail outlet for the excellent engine sound module designs of Alan Bond of Forge Electronics for many years and have proudly supplied over 1,000 of these units to modellers around the world. The good news is that Alan is going to continue production of the programmable sound unit so please visit the Forge-Electronics website for pricing and availablility.
The programmable engine sound system Mk2, which like the original version (3803-220) allows you to alter its character to suit your type of model but now accepts a potentiometer input as well.
All of our engine sound units were designed for RC model applications but what about non-RC applications like the Toylander childrens electric vehicles for example? Well now that is covered by the Mk2 version of the programmable engine sound unit with its choice of either RC input or Pot input.
All other features remain the same as the Mk1 version with the same great sounds and user friendly configuration options. A dip switch is used to select RC or Pot input but the user manuals differ, simply select the RC or Pot manual when ordering and we will include the appropriate full colour manual with your order. You can also download both versions of the manual from the 'Downloads' tab. For the Pot version, the accelerator pedal will need a dedicated pot for this sound unit, you cannot share the pot that is used for any motor speed controller.
This Sound System carries on from where the original Technobots Petrol and Diesel Sound units left off, and not so much replaces them as compliments them. The original Sound units continue to be small, affordable, entry-level products whereas this Sound System in a slightly larger package scopes the sound range of the two earlier Sound Systems and offers a whole host of features:-
- Option of RC or Potentiometer input (see additional image above for typical wiring schematic for potentiometer input (Toylander) applications)
- 10 factory preset voices and an additional 10 user defined voices encompassing both petrol and diesel engine sounds
- Push button neutral setting
- RC Version
Provision for a second throttle input – the engine note follows the faster of the two throttle demand
Provision to process an auxiliary input channel, either digital (switched) or proportional (joystick) which may be used as follows:
Digital - use for horn on/off OR engine start/stop (user choice)
Proportional - use opposite throws of the joystick for horn on/off AND the engine stop/start (toggle action) though the user may prefer engine stop/start to be throttle dependent
- Pot Version
Single Throttle Channel - accepts (linear track) potentiometer
Toggle Switch operates horn
Toggle Switch for engine run/stop
- Horn - uses the engine speaker, replacing the engine sound whilst operated - sounds at maximum volume regardless of engine volume setting
- Push button adjustment (during real-time operation) of
Set pitch for each cylinder (128 possible values) Set duration for each cylinder (5 possible values)
- Tick over
- Top speed
- Number of cylinders – from 2 to 6, though single cylinder operation is simulated in voice #6
- Engine 'voice' – 10 fixed, 10 custom (user defined)
- Pitch of the horn
- Idle timeout period (only valid for auto start/stop option) – 0 to 90 secs in 10 second increments, or continuous running
- Voice designer mode (for custom voices only)
All settings are saved into the Sound System's non-volatile memory and are retrieved at switch-on the next time the Sound System is powered up.
- Volume control – controls engine sound volume only
In all cases the engine sound varies smoothly and proportionally with the throttle demand in both forward and reverse. RC version - a further input may be assigned to a second throttle channel in the case of twin screw boats or 'tank' steered vehicles.
The Sound System can be used with any radio system, including PCM, that utilises the industry standard 1-2mS servo signal. 'Neutral' (i.e. joystick at centre position) is generally set at 1.5mS, though the Sound System can cope with any neutral setting within the entire industry standard range to accommodate 70/30 pistol type transmitters often supplied with model cars, or forward only speed controllers. The neutral condition is indicated by a case mounted status LED which assists in setting the transmitter throttle trim. The range and the neutral zone of the throttle response may also be set by a simple push-button procedure.
Supplied complete with a full set of printed instructions and the parts necessary to make up a RC lead to attach the sound unit to the radio receiver. If using the second throttle input or the horn option, you will require a second RC lead (plug to plug) or you can make your own up to your desired length using our female/female pre-made wires and housings. If space allows we recommend our 10W speaker although we do have other types available.
Speed demand sensing method
Receiver throttle channel(s) - Sound System has pass-through(s) to ESC(s) or potentiometer
Neutral (idling) signal condition
May be set by push button anywhere in 1mS to 2mS range
Joystick/Potentiometer span adjustment
Ensures full throttle condition can be achieved for transmitters producing less than the full 1mS to 2mS range or potentiometers where the mechanical linkage doesn't allow full travel. Also matches full throttle to the larger span in offset neutral applications (70/30 or forward only controllers)
Receiver voltage (which powers the Sound System's electronics)
4.8V min to 6V max (this is usually supplied by a nominal 5V BEC which is often incorporated in the ESC) DO NOT USE A “6V” LEAD ACID BATTERY – a fully charged one of these can output as much as 6.6V. Your receiver and servos may stand it, but this Sound System won’t!
8 ohm minimum (Technobots part no. 2400-015 recommended)
Speaker supply voltage
From zero to '12V'. There is a 16V rated capacitor across this input, exceed this voltage at your peril! A fully charged 12V lead acid battery will be in the region of 13.5V and hence is ok, but 12 cells NiMH, a nominal '14.4v', will exceed 16V when fully charged and is not ok.
20 different voices (10 fixed, 10 user defined), encompassing 'petrol' and 'diesel' characters
Number of cylinders
Selectable from 2 to 6, though single cylinder operation is simulated in voice #6 (see later)
Choice of automatic or manual – automatic is determined by the throttle demand and the idling period, whereas manual responds directly to an auxiliary r/c channel
Engine idle timeout
For the case of automatic start/stop, the idling period may be set from zero to 90 seconds in ten second increments or optionally continuous running may be set.
Dimensions (including flange mounting base)
Overall length 96mm, overall width 54.5mm, overall height 29mm, weight 58g
Download the PDF version of the 28 page Pot version or the 36 page RC user manual from the 'Downloads' tab for full details on how to install (with wiring diagrams) and program the engine sound system.
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