 US-Canada Customers! You can find this product on J&H Aerospace US |
This lightweight band burner e-Timer is the updated version of our previous JST and pin-based timers.
It offers plug-and-play use with Micro JST 1.25mm batteries. Alternatively, the JST socket can be removed and wires soldered directly to onboard pads.
This is the lightest electronic dethermaliser (DT) solution for small models. It works by heating a thin wire to cut a rubber band or string after a specified delay—useful for controlling rudders, elevators, or releasing wings.
⚠️ Note: Older blue version (pre–27 June 2023) used 1s timer steps and had a heavier 1.7g board. The new black lightweight version (0.8g) uses 10s increments. Some photos may show the earlier version, but all orders ship with the updated board.
📄 Download Manual
▶️ Demo Video
You can safely leave the battery connected throughout the day. The idle current draw is so low the timer can remain on standby for up to 42 days using a 100mAh battery.
🛠️ Firmware Update (03 Jan 2022)
Due to limited availability of high-current LiPo batteries, the firmware was updated to reduce heater current by 50% for compatibility with protected 80–100mAh cells. Heating is sufficient for dethermaliser function but may be less effective in extreme cold.
If using a high-current unprotected battery, you can re-enable full power mode by bridging the solder pads shown below:
The default low-power mode is ideal for lightweight installations.
📦 Compatible Accessories
⏱️ How to Set Timer Duration
- Press and hold the button before connecting the battery.
- While holding the button, connect the battery.
- The LED turns solid red. Release the button.
- Press and hold again; each blink adds 1 second.
- Release when desired duration is reached.
- LED flashes rapidly 5 times to confirm save.
🎛️ How to Use BMK e-Timer
- Plug in the battery.
- Voltage ≥3.7V: LED flashes every 2 seconds.
- Voltage <3.7V: LED double-flashes—recharge required.
- Press and hold for 2 seconds to arm; LED goes solid red.
- Release button to start countdown. LED flashes rapidly.
- Heater activates for 2s after countdown completes.
- Click the button anytime to cancel the timer.
▶️ Additional Demo
⚙️ Features
-
Weight: 0.8g (new black version)
*1.7g (original blue version) - Dimensions: 22mm × 10mm × 5mm
-
Max Timer Duration: 2500 seconds (~41 min)
*250 seconds (older version) -
Timer Steps: 10s
*1s for original version - Tolerance: ±1% typical
- Activation: Hold button ≥2s, release to start
- Cancel: Click button during countdown
- Operating Voltage: 3.0 – 5.0V (1S LiPo compatible)
- Power Use: 0.06mA idle / 0.6mA active / 1000mA burning (2s)
- Max Output: 5A continuous
- Low Battery Warning: <3.7V (double flash at idle)