Blue series 20A ESC

From Hobbyking's website specifications:

Cont. Current: 20A
Burst Current: 30A
Battery: 2-4 Cell Lipo / 5-12 Cell Ni-XX
SBEC: 5V/ 2A Output
Size: 33*23*6mm
Weight: 18g
Fig 1:

Fig 1 shows the label of a Blue series 20A ESC (its clear shrink cover removed).

Fig 2:

Fig 2 shows the ESC. This uses a TFQP32 package Atmega8A, so connection using the Hobbyking chip adapter (332000007) is convenient.

The three capacitors nearest the top right corner are the BEMF filter caps (already removed in Fig 2).

tgy bs_nfet.hex 2013-04-24 was installed and tested.

Fig 3:

Fig 3 shows the results of a test of the standard BS20A ESC, and with tgy loaded. The graph is the results of a 20s sweep from zero to full power on 12.6V with an 8040 propeller.

It can be seen that the current is more erratic with the standard FW, and average current consumption at 6000 rpm (hover speed) is around 7% higher than with tgy FW.



No warranty

Advice (or a warning) to those who might try to replace the firmware on an ESC. Most FW comes with no warranty, and typically the OEM firmware is read protected so you cannot save and restore it. In most cases, changing the firmware may terminate any seller's warranty.

In making hardware or firmware modifications, you may damage the ESC, or the model may fail and cause consequential damage.

The author gives no warranty and makes no representations about the suitability of this technique or any particular products for the end user, or the accuracy of the article content, they must inform themselves and make their own judgment aware that there are risks. If you are not competent to do these things, don't do them!


The article should not be seen as a recommendation or endorsement of any products.

The products shown in this article are from Hobbyking who manufacture products under a range of brand names, possibly creating an illusion of competition. Their products tend to be low in cost and low in quality, products are not good value when you have to throw a proportion of them in the rubbish because the cost of returning them exceeds the value of the replacement which is only available after excessive delay, many follow ups and haggling. If you see the claim [o]ther stores will force you to ship the product back to China in full retail packaging every time! Hobbyking's warranty service is professional, fair and fast, don't believe it, it doesn't work that way in my experience... I get better service from most eBay sellers!




Version Date Description
1.01 25/05/2013 Initial.

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