Please join my Facebook group for updates and your questions.

BMK Band Burner e-Timer - Micro JST version

Regular price £15.90

  US-Canada Customers! You can find this product on J&H Aerospace US

Micro JST 1.25mm version of our Band Burner timer for solder-free installation.

Band Burner e-Timer is the lightest electronic D/T solution for small model builds.
Simply, It cuts the rubber band or string by heat after the specified time. You can control the rudder, elevator or something else.  

*Please Note: The timer increment was 1 second for the original blue version until 27 June 2023.
  It's updated to 10s intervals with the new black and lightweight boards.


You can keep the battery installed during the flight day or more.
The low-power electronics can wait at idle mode for 42 days (!!!) with a tiny 100mAh battery.

This image has an empty alt attribute; its file name is heater-1.png

The hand-winded special Ni-Chrome heater will get red hot(full power mode) in a second with only a 1000mA current. 

Band Burner Timer Update!! 03 January 2022
Because of the following high current battery shortage, 
I've reduced the current draw of the band burner timers in half with new firmware.
The band burners will work with the protected 80-100mA LiPo batteries but not glow red as in previous versions. The heater temperature is still enough to burn elastic hair bands but may fail in extreme cold.
If you have a high-current unprotected battery, you can put a solder drop between these pads(see photo below) and the timer will switch to the high current (glowing red) mode automatically.
The default low current mode is also good for a lightweight installation.

Quality silicone elastic bands:



This image has an empty alt attribute; its file name is band_burner_schematic.png

How To Set Timer Duration?

  • Press and hold the button before plugging the battery.
  • Plug the battery when holding the button
  • The LED will turn solid red.
  • Release the button and the LED will be turned off.
  • Press and hold the button and count the LED blinks.
  • Each Blink adds 1 second to the timer. For example, 30 flashes, means 30 seconds.
  • Release the button when you reach the required timer duration.
  • The LED will fast flash 5 times when saving the timer setting.
  • Then it will return to normal mode. Now you can remove the battery or use your timer.

How To Use BMK e-Timer?

  • Plug the battery
  • If the battery voltage is above 3.7v, the LED will flash every 2 seconds.
  • If the battery voltage is below 3.7v, the LED will flash twice every 2 seconds. You must recharge the battery.
  • Press and hold the button for at least 2 seconds to arm the timer before launch. When armed the LED will solid red.
  • Release the button when launching and the timer countdown will start. During the countdown, the LED will flash fast.
  • When the countdown is complete, the timer will turn on the heater for 2 seconds.
  • Click the button to cancel If you have accidentally released the button or your model has landed before the countdown is complete.



  • Weight: 1.1g
    *1.7g for the original blue version until 27 June 2023
  • Dimensions: 23mm x 11mm x 5mm
  • Maximum Timer Duration:2500 seconds (41 minutes)
    *250 seconds for the original blue version until 27 June 2023
  • Timer Steps: 10 second
    *1 second for the original blue version until 27 June 2023
  • Timer Tolerance: +-1% typical
  • Timer Activation Method: Hold the onboard button for at least 2 seconds, the timer will start when the button is released.
  • Timer Cancel Method: Click the onboard button
  • Operation Voltage: 3.0 - 5.0v (compatible with 1S LiPo battery)
  • Power Consumption: 0.06mA @ idle / 0.6mA @ countdown / 1000mA @ burning(2 seconds).
  • Maximum Output Current: 5A continuous
  • Low Battery Warning: <3.7v (double flashes @ idle mode)