quick TBLE-04S question

[Saito2]

Stupid question. Does the TBLE-04S have built-in BEC?

[Sir Crashalot]

Yes, BEC has been around since the mid 80's.

[Saito2]

Just checking. The earlier Tamiya kit included ESCs like the TUE101BK and TEU104BK did not have BEC despite them being common since the mid 80's. 

[Sir Crashalot]

That seems odd?. The TEU-101BK I have has BEC.

I don't know of any ESC without BEC.

 

[Saito2]

The 101BK and 104BK have a plug that goes into the receiver but supplies full battery voltage through it rather than stepping it down the "safer" 6v or so. IIRC, there have been threads on here about adding external BECs to those ESCs BITD. It is odd Tamiya left it out of those earlier ESCs

[alvinlwh]

3 hours ago, Saito2 said:

Just checking. The earlier Tamiya kit included ESCs like the TUE101BK and TEU104BK did not have BEC despite them being common since the mid 80's. 

I never knew the 101 has BEC until someone said so and I tried it out as 12 years ago when I started, the RX also has a BATT socket. Same for the 104, never knew it so I used a RX with BATT/BEC input. Turns out I can use my ancient 27AM Rx with modern ESC if I wanted to. 

[Sir Crashalot]

6 hours ago, Saito2 said:

The 101BK and 104BK have a plug that goes into the receiver but supplies full battery voltage through it rather than stepping it down the "safer" 6v or so.

Most servos run off 4.8-6.0V. I checked the voltage of the two pin receiver plug on my TEU-101BK, it was 6.0V.

[Re-Bugged]

Yep they do have a BEC @Saito2, I did notice in manual with the one I’ve just fitted that it states using a digital servo with more than a 1.5v draw ‘could’ damage the ESC. 

[Saito2]

7 hours ago, Sir Crashalot said:

Most servos run off 4.8-6.0V. I checked the voltage of the two pin receiver plug on my TEU-101BK, it was 6.0V.

Now that is surprising. Its been said for many years that the 101 and 104 did not have BEC. This was taken form Tamiya's website recommending the use of a receiver with BEC with the 101. 

• SPECIFICATIONS

RC ESC TEU-101BK BRUSHED

1. DESCRIPTION

    

   •  
   • High quality FET with output compatible with up to a sports tuned class motor.
   • Easy push-button setup for maximum positioning of neutral / acceleration and reverse (braking).
   • Features reverse disable function for competition races.
   • Compatible with most makers RC systems.

   
   The TEU-101BK is an easy to use ESC
   that boasts all the functions of the high performance TEU-302BK with power
   output equivalent to the CPR-01. With
   size and shape virtually the same as the
   TSU-01, the TEU-101BK can be fitted
   in most old RC cars.
    

   
   
   
   

   
   
   
   Click here to find out
   how to properly plug this ESC into a receiver.
   *Always use receiver with BEC. Using other receivers may result in malfunction of receiver.

    

    

    

[Saito2]

 

"hi ,

the 101bk feeds the receiver with whatever voltage the main battery gives out as the 101 has no built in BEC, the 2.4ghz radios mentioned will only accept 8.4v peak IE Li-Po , with ni-mh or ni-cad the peak output can exceed this voltage max and thus you get a brown out or safety mode engages ,

as for the max throttle issue , have you calibrated the ESC and radio ? as its that which determines the end point for full throttle ,

if you are running too hot a motor the esc will go into safe mode when the current draw exceeds the ESC's capability.

hope this helps ."

 

"As alfagta said, the TEU-101BK (and -104BK) doesn't feature a battery eliminator circuit (BEC), as it is intended to be a plain replacement for Tamiya's mechanical speed controllers. This means it will feed the full unregulated battery voltage (7.2V and above) to the receiver (and thus to the steering servo, too)."

 

"Just a word of caution! I like the TEU-101BK, i have alot of them. BUT, remember that it doesent have a BEC circuit." 

 

"I slice the 2 bumps from the top of the red plug so it will fit in the receiver. If you are lucky you may find another plug that will fit and you can just pop the pins backwards out of the original red plug and put them in the plug that fits.

I've only found 1 receiver so far that this ESC will not work on, an old Hi-Tec. There are threads on it here if you do a search. This ESC does not have BEC, hence the BATT wire."

 

 

Just so it doesn't look like I'm crazy, here's some quotes about the 101's lack of BEC over the years. I'm not saying you're incorrect @Sir Crashalot. In fact, you may a just busted an internet/Tamiyaclub myth.

 

[Saito2]

13 hours ago, Sir Crashalot said:

Most servos run off 4.8-6.0V. I checked the voltage of the two pin receiver plug on my TEU-101BK, it was 6.0V.

I just did the same and got these results:

8.31v at the battery and...

8.30v at the 2 pin receiver plug, so basically no reduction in voltage= no BEC correct? Am I doing something wrong in the test or missing something (no sarcasm intended, just an honest question)?  Perhaps the 101BKs were not all the same? 

[Sir Crashalot]

Yes, there must be differences in design.

It still has BEC though.

There may be some confusion over what BEC means. It was originally built-in to mechanical speed controllers to get rid of the 4 AA cells that were used to power the radio gear, hence battery eliminator. The radio gear then gets its power from the "stick" pack.

[alvinlwh]

Just learnt something new today. I do recall that my very old AM27 RX has BEC on its label. Also, some of my Carson 2.4 RX has BEC marked on their input, which I uses with the 101 and 104. 

https://www.blackholesun.fr/index.php/en/41-en/rc-tech-guides/206-electronic-speed-controllers-esc-mechanical-speed-controllers-msc-motors?start=1

"Originally, every RC model had to carry a battery box dedicated to feed the receiver and the servos (steering and throttle). The BEC system allowed to eliminate this heavy and bulky pack of batteries (at least on electric RC models). However, receivers and servos only bear voltage between 4.8V and 6V when battery packs supply 7.2V. So the BEC serves as a voltage regulator to feed the receiver and servos with the correct voltage, independently of the battery pack voltage. On Tamiya first models to benefit from it (the Hotshot in 1985), this device was integrated into the switch. Further on, receivers and/or controllers integrated this system (at least one of these two components needs the BEC in order to preserve the servo(s) and/or the receiver).

Today, the BEC is still important: while the vast majority of AM or FM receivers had the BEC system (so having the BEC or not in the controller was not critical), 2.4GHz receivers do not have BEC. For example, in a model equipped with a 2.4GHz receiver and a TEU-101BK controller, the receiver and the steering servo are supplied with the battery pack 7.2V voltage. In concrete, it works thanks to the tolerance of the components... until the day the may send smoke signals."

[Nwc100]

On 10/31/2021 at 6:06 PM, Sir Crashalot said:

Yes, there must be differences in design.

It still has BEC though.

There may be some confusion over what BEC means. It was originally built-in to mechanical speed controllers to get rid of the 4 AA cells that were used to power the radio gear, hence battery eliminator. The radio gear then gets its power from the "stick" pack.

Ahhh the good old days, how many times was I too poor to be able to buy AA batteries, would swap over to the BEC and run the gauntlet of the car shooting off in some random direction when the MSC servo didn’t get enough  power to move! Luckily I was only 12 back then and chasing after my Sonic Fighter was part of the fun! Thankfull I don’t have any of these dramas anymore, however I’m 💯 that my 6yr old would absolutely love that happening when we run the cars!
 

I’m pleased he can find the same enjoyment I had from Tamiya🙂