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Shown below is a very good drawing showing how to wire in BEC Circuits in general. Comes from Castle Creations and is provided with thier BEC Pro instruction set.
Castle Creations BEC Wiring Diagram Sample.
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| Castle Creations CC-BEC RX Battery Eliminator Circuit
What the heck is a BEC? CC BEC Battery Eliminator Circuit is a little device that eliminates the need for a receiver and servo battery pack. It draws higher voltage from the motor batteries and drops it to a voltage level that is suitable for your receiver and servos. This is required in applications which draw high power for multiple servos or use more than 3S motor packs, as most ESCs with linear BECs are not designed for these applications. The CC BEC uses a Switch Rate method that is vastly more efficient than common circuits that use sweat of much of your power through a heat sink.
Peak Current Output: 10 amps
Continuous Current Output: @12 Volts input 7amps, @ 24volts input 5 amps **
Output Voltage: 5.1 volts out of the package, user may set output voltage from 4.8 to 9 using the Castle Link (sold separately).
Input Voltage: 5 to 25.2v (2S to 6S LiPo)
Length: 1.2" (30mm), Width: .6" (15mm), Height: 4" (10mm)
Weight: 0.4 oz (11 grams)
**Ratings are determined with a 5mph airflow on the BEC. Servo connectors are not rated for current in excess of 5 amps. Users are encouraged to replace the connectors if more than 5 amp currents are anticipated. Modifications available below. For models containing digital servos (3D Heli's for sure!) which could demand currents 4 amps or more, increasing the output connection with double leads is strongly urged.
Advice from Dave on setting voltage: For simulating a typical 4.8V RX pack set voltage 5.1v to 5.4v. For simulating a 6V pack, set voltage to 6.4 to 6.8. Battery packs are not any set voltage but work over a range of voltages. Think about what your trying to simulate. A 4.8v pack is empty at about 4.4v, full at about 6v. A 6v pack is empty at 5.5v and full at about 7.5v. For heli's where the tail servo and gyro won't take 6v packs, what the MFG is saying is it won't take 7.5V. Setting heli voltage to even 5.8 or 5.9 is fine as it just looks like a 4.8V pack hot off the charger. For older 2.4GHZ systems (Anything not Hitec/Airtronics and pre 2011 gear) we reccomend setting voltage to 5.4-6V range MINIMUM.
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SKU Number:CCBEC
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| Castle Creations CC-BEC PRO Battery Eliminator Circuit
Need a BEC to drive a really large load? Useful for high servo counts or many digital servos on larger craft. Use as a power supply aboard your UAV to drive sensor, transmitters or whatever your client has you testing.
NOTE: CC BEC Pro should never be operated in series or parallel with another BEC or backup receiver pack connected to the RX/Servo side of the circuit.
Size: 1.69" (43mm) x 1.3" (33mm)
Height: 0.94" (24mm)
Weight: 1 oz* (29g*)
Max Amps: 20 amps peak**
Max Volts: 2s to 6s LiPo Cars: 6s (25v), Airplanes: 10s (40v), Helicopters (with brake disabled): 12s (50v)
Adjustable Output Voltage :4.8V to 12.5V
*Weight without wires
**Ratings are determined with a 5mph airflow on the BEC.
Advice from Dave on setting voltage: For simulating a typical 4.8V RX pack set voltage 5.1 to 5.4. For simulating a 6V pack, set voltage to 6.4 to 6.8. Battery packs are not any set voltage but work over a range of voltages. Think about what your trying to simulate. A 4.8v pack is empty at about 4.4v, full at about 6v. A 6v pack is empty at 5.5 and full at about 7.5. For heli's where the tail servo and gyro won't take 6v packs, what the MFG is saying is it won't take 7.5V. Setting heli voltage to even 5.8 or 5.9 is fine as it just looks like a 4.8V pack hot off the charger. For older 2.4GHZ systems (Anything not Hitec/Airtronics and pre 2011 gear) we reccomend setting voltage to 5.4-6V range MINIMUM.
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SKU Number:CCBECPRO
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| Ultimate BEC 5 Volt Standard
The Ultimate BEC eliminates the need for a separate battery pack to power your Rx and servos. Use the Ultimate BEC when:
Your cell count and / or number of servos exceed your speed control's ratings.
Simple to install! All you do is solder the UBEC input leads onto your speed control power input leads.
Plug the UBEC into your RX where you would plug in your Rx battery. - OR - Plug the UBEC into a standard on/off switch harness.
Make sure you disable your speed control's BEC by cutting (or removing the pin from the connector shell) the red wire (Castle and most other brands)that's running to your throttle channel from the BEC.
FAQ:
What makes the Ultimate BEC different from the BEC in my speed controls? Speed controls use a linear voltage regulator to reduce your battery pack voltage to 5 volts. The challenge with this kind of system is that it is limited by the input voltage and output current. Each ESC has a limit as to the amount of watts of heat it can dissipate. The Ultimate BEC is a switching power supply where input voltage and output current are independent of each other.
Will the Ultimate BEC cause any radio interference? Absolutely not. As a matter of a fact, most speed controls put out way more "noise" than the UBEC. The UBEC has been designed on a custom copper flooded board and utilizes a shielded coil to eliminate any "noise". Most importantly, any "noise" that radiates from the UBEC is not relevant to the bands within our radio systems.
How do you keep your battery from running too low? Most speed controls have a low voltage cutoff feature to keep you from running down your battery too low. Most low voltage cutoff features cut power to your motor between 4.7 to 5.5 volts. The UBEC will goes into bypass mode at 5.5 volts. Thus, your Rx will still get power from your battery.
How many servos can I run on the UBEC? Servo currents vary by brand and type. However, 8-10 servos should be no problem. The main thing to remember is that the UBEC is rated for 3 amps continuous / 5 amps peak.
Specs:
Input Voltage 5-35 volts (to 24 NiMh/NiCad or 8 Lipos)
Output Voltage 5 volts
Weight 20 grams
Output Current 3 amps continuous / 5 amps up to 5 minutes
Dimensions 1 1/4 inches wide x 1 3/4 inches long x 3/8 inch thick
Type High efficiency Switching Voltage Regulator
Input / Output leads 12 inches in length
Output servo connector Universal
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SKU Number:UBEC35V5VSTIG
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| Ultimate BEC 5V High Voltage 5 Volt Output, 6-45 Volt Input
The Ultimate BEC eliminates the need for a separate battery pack to power your Rx and servos. This is the high voltage version accepting up to 45 volts input. Same notes as above except specifications a follows.
Specs:
Input Voltage 5.5-45 volts (to 28 NiMh/NiCad or 10 Lipos)
Output Voltage 5 volts(<35mv ripple)
Weight 20 grams
Max no. servos 8-10
Output Current 3 amps continuous / 5 amps up to 5 minutes
Dimensions 1 1/4 inches wide x 1 3/4 inches long x 3/8 inch thick
Type High efficiency Switching Voltage Regulator
Input / Output leads 12 inches in length
Output servo connector Universal
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SKU Number:UBEC45V5VHV
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| ParkBEC 5V
The ParkBEC is the smallest and lightest switch-mode BEC on the market. ParkBEC powers your receiver and servos much more efficiently than a standard BEC. As many as six sub-micro servos can be powered without worrying about an overheating BEC. ParkBEC works great up to very high voltages, and is especially suited for running parkflyer type aircraft. ParkBEC is often a necessity at 4s and above.
Many people don't realize that their ESC's BEC rating is misleading. With the linear BEC built into most speed controls, the current rating decreases as pack voltage increases. For example, several popular 25A ESCs with "3A" BECs are only capable of supplying 0.5A when running from a 3s pack. Because it is an efficient switching regulator, ParkBEC can supply its full rated current of 1.25A all the way up to 8s.
ParkBEC was carefully designed to not create radio interference. It uses a shielded inductor and optimized layout, so you can use it without fear of glitching.
The ParkBEC installs between your ESC and receiver, so you don't have to modify your speed control to disable its internal BEC. Just plug ParkBEC in!
ParkBEC is designed for use with lithium aware ESCs. If your ESC does not have a setting for high voltage lithium packs, please use the Dimension Engineering SmartBEC which includes an integrated lithium cutoff to protect your flight pack.
For best results, ensure that the ParkBEC is installed at least 2 inches away from your receiver and antenna.
ParkBEC cannot power multiple digital servos.
Specifications:
Input voltage: 6V to 33.6v (2s-8s lithium, up to 21 NiMHs)
Output current: 1.25A continuous, 1.5A 60 second peak. (6 4-9g servos, 4 standard servos)
Weight: 6.2g/.22oz
Weight Without Wires: 4.1g/.14oz
5 Volt output
Universal connector fits all receivers
1.3V dropout voltage at 1A
Can be put in parallel
Applications: Parkflyers
Small 3d aircraft
Micro helicopters
Robots
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SKU Number:PARKBEC5V
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| Micro UBEC
The Micro UBEC is a compact, lightweight switch mode regulator specifically designed to meet the needs of small electric planes. PCB layout, switching freqency, and the use of a shielded inductor ensure that radio performance is not degraded. The Micro UBEC also incorporates reverse polarity protection.
The Ultimate BEC eliminates the need for a separate battery pack to power your Rx and servos. Use the Ultimate BEC when:
Your cell count and / or number of servos exceed your speed control's ratings.
Simple to install! All you do is solder the UBEC input leads onto your speed control power input leads.
Plug the UBEC into your RX where you would plug in your Rx battery. - OR - Plug the UBEC into a standard on/off switch harness.
Make sure you disable your speed control's BEC by cutting (or removing the pin from the connector shell) the red wire (Castle and most other brands)that's running to your throttle channel from the BEC
FAQ:
What makes the Ultimate BEC different from the BEC in my speed controls? Speed controls use a linear voltage regulator to reduce your battery pack voltage to 5 volts. The challenge with this kind of system is that it is limited by the input voltage and output current. Each ESC has a limit as to the amount of watts of heat it can dissipate. The Ultimate BEC is a switching power supply where input voltage and output current are independent of each other.
Will the Ultimate BEC cause any radio interference? Absolutely not. As a matter of a fact, most speed controls put out way more "noise" than the UBEC. The UBEC has been designed on a custom copper flooded board and utilizes a shielded coil to eliminate any "noise". Most importantly, any "noise" that radiates from the UBEC is not relevant to the bands within our radio systems.
How do you keep your battery from running too low? Most speed controls have a low voltage cutoff feature to keep you from running down your battery too low. Most low voltage cutoff features cut power to your motor between 4.7 to 5.5 volts. The UBEC will goes into bypass mode at 5.5 volts. Thus, your Rx will still get power from your battery.
How many servos can I run on the UBEC? Servo currents vary by brand and type. However, 8-10 servos should be no problem. The main thing to remember is that the UBEC is rated for 3 amps continuous / 5 amps peak.
Specs:
Input Voltage 5.5-23 volts (to 5-15 NiMh/NiCad or 2-5S Lipos)
Output Voltage 5.25 or 5.85 volts (selectable).
Weight 9 grams
Output Current 2.0 amps continuous / 2.5 amps peak (2 minutes)
Dimensions 42mmx17mmx7mm
Efficiency : 88% @ 12vdc input, 5v output, 1.5amp load.
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SKU Number:UBECMicro
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| Very High Voltage BEC
Dimension Engineering's Very High Voltage BEC is the world's first BEC compatible with input voltages as high as 60V/14s lithium. Perfect for pilots who will be flying with very high voltage battery packs. It can power your receiver and servos with up to 2.5A. VHVBEC is especially well suited for high voltage helicopters running 4 high speed/torque digital servos. Installing and using VHVBEC is much more convenient than monitoring and recharging a receiver pack.
VHVBEC's output is selectable between 5V/6V using a small slide switch. The 6V setting gives more speed and torque to the servos and is especially useful for helicopter flyers. A red LED indicates when 6V is selected.
As with all of Dimension Engineering's BEC products, VHVBEC has been carefully designed and tested to ensure it does not create radio interference. You can use it without fear of glitching.
When used with non-optoisolated speed controls, VHVBEC has a handy throttle pass-through feature that allows you to install it without cutting up your ESC's wires. When used with optoisolated speed controls, VHVBEC installs easily by plugging it into the battery port of your receiver.
For best results, ensure that your VHVBEC is installed at least 2 inches away from your receiver and antenna.
Specifications:
Input voltage: 9V to 60V (3s-14s lithium, up to 40 cell NiMH)
Output current: 2.5A (~6 standard servos, 4 digital)
Weight: 17g/.6oz (including wires)
Universal connector fits all receivers
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SKU Number:VHVBEC
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| ParkBEC 6V
The ParkBEC 6V is the 6 volt output version of our ParkBEC, the smallest and lightest switch-mode BEC on the market. The 6 volt output will give you more servo speed and torque than standard 5V models. It can support as many as six sub-micro servos.
ParkBEC 6V is especially well suited for small helicopters and 3d planes, where extra response speed or torque are needed.
It weighs only 6.5g and is designed for running parkflyer type aircraft with pack voltages up to 33.6V.
The ParkBEC 6V installs between your ESC and receiver. You don't have to modify your speed control to disable its internal BEC, just plug the ESC into the ParkBEC 6V. It uses a switching type power supply to efficiently convert high pack voltages into a steady 6 volts.
Additional notes
If you are using small servos make sure they can run at 6v. Some sub-micros, notably the Hitec HS-50 and Futaba S3154, can be damaged by a 6v supply.
For best results, ensure that the ParkBEC 6V is installed at least 2 inches away from your receiver and antenna.
ParkBEC 6V is not compatible with 2s lithium packs.
ParkBEC 6V cannot power multiple digital servos.
Product Specs
Model: ParkBEC 6V
Specifications:
Input voltage: 8V to 33.6v (3s-8s lithium, up to 21 NiMHs)
Output current: 1.25A continuous, 1.5A 60 second peak. (6 4-9g servos, 4 standard servos)
Weight: 6.5g/.23oz
Weight Without Wires: 4.4g/.16oz
6 Volt output
Universal connector fits all receivers
1.3V dropout voltage at 1A
Can be put in parallel
Applications:
Parkflyers
Small 3d aircraft
Micro helicopters
Robots
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SKU Number:PARKBEC6V
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| Sport BEC
SportBEC is the higher capacity version of our best-selling ParkBEC product. SportBEC powers your receiver and servos much more efficiently than a standard BEC. As many as 8 servos can be powered without worrying about an overheating BEC. SportBEC works great up to very high voltages, and is especially suited for "sport" aircraft and glow conversions. SportBEC is usually a necessity at 4s and above when running high torque or digital servos.
SportBEC's output is selectable between 5V/6V using a small slide switch. The 6V setting gives more speed and torque to the servos, and is especially useful for helicopter flyers. A red LED indicates when 6V is selected.
Many people don't realize that their ESC's BEC rating is misleading. With the linear BEC built into most speed controls, the current rating decreases as pack voltage increases. For example, several popular 25A ESCs with "3A" BECs are only capable of supplying 0.5A when running from a 3s pack. Because it is an efficient switching regulator, SportBEC can supply its full rated current of 3.5A all the way up to 8s.
Many design hours were spent on SportBEC to ensure it does not create radio interference. It uses a shielded inductor and optimized layout, so you can use it without fear of glitching.
SportBEC installs between your ESC and receiver, so you don't have to modify your speed control to disable its internal BEC.
For best results, ensure that the SportBEC is installed at least 2 inches away from your receiver and antenna.
Additional notes
If you are using small servos make sure they can run at 6v. Some sub-micros, notably the Hitec HS-50 and Futaba S3154, can be damaged by a 6v supply.
Specifications:
Model: SportBEC
Specifications: Input voltage: 9V to 33.6v (3s-8s lithium, up to 21 NiMHs)
Output current: 3.5A (~8 standard servos, 4-6 digital)
Weight: 13g/.46oz (including wires)
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SKU Number:SportBEC
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