Product overview
The Rctimer Mini BLHeli OPTO ESC20A (OneShot125), also identified as BLM20A, is an electronic speed controller intended for multicopters and small aircraft installations. Its configuration combines BLHeli 14.1 firmware with OneShot and damped light enabled, alongside an output PWM frequency of 18KHz. Fast throttle response is a stated feature. The throttle signal uses a twisted-pair cable intended to reduce crosstalk during signal transmission, making the signal wiring part of the controller’s integration design.
The controller measures 23*12*4.5mm and weighs 2.0g without wires, providing a compact board footprint for installation. Its construction includes miniaturized, ultra-low-resistance N-channel MOSFETs, onboard capacitor filtering and thickened PCB copper; low heat is a stated design characteristic for small aircraft. Electrical integration is bounded by the specified 6-16.8V input range for 2-4S LiPo batteries and 20A output current. There is no BEC, so the controller does not provide that power-supply function within its supplied configuration.
Specifications
| Specification | Value & conditions |
|---|---|
| Manufacturer and model | Rctimer Mini BLHeli OPTO ESC20A (OneShot125), BLM20A |
| Intended application | Multicopter electronic speed controller with fast throttle response. |
| Enabled control features | OneShot and damped light both enabled. |
| Throttle signal cable | Twisted-pair throttle signal cable intended to reduce signal crosstalk. |
| MOSFET architecture | Miniaturized, ultra-low-resistance N-channel MOSFET design. |
| Board construction | Onboard capacitor filtering and thickened PCB copper, with low heat described for small aircraft. |
| Input voltage | 6-16.8V (2-4S LiPo)2-4S LiPo |
| Output current | 20A |
| BEC | Without BEC |
| Output PWM frequency | 18KHz |
| Firmware | BLHeli 14.1 |
| Weight | 2.0gWithout wires. |
| Dimensions | 23*12*4.5mm |
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