(Silicon Chip Magazine June '11) This gutsy little speed controller has a wide range of applications and is simple to build and use. There are no software settings to fiddle with but it does have some really useful features such as low-battery protection, soft start and adjustable pulse frequency. It can run from 12V or 24V batteries at currents of up to 20A.
NOTE: This kit is only suitable for use with DC motors
Requires 1 x 12/24V SLA battery (sold separately)
Important Note For Kit Buyers:
This product is supplied in component form and requires soldering, drilling, and assembly. We recommend users are familiar with at least basic electronic principles and have the ability to solder.
Features
- 20A current rating
- 12V or 24V operation
- On-board trimpot or external potentiometer for speed adjustment
- Optional soft start
- 0-100% speed control range
- Efficient PWM control
- PWM frequency adjustment
- Low battery protection
Specifications
- Supply Voltage: 12-30VDC
- Supply Current: 20A maximum
- Output Current: 20A maximum
- Standby Current: 20mA
- Control Range: 0-100%
- Low Voltage Cut-out: typically set for 11.5V (for 12V battery) or 23V (for 24V battery)
- Pulse Frequency Adjustment: ∼100Hz to 1.1KHz (129Hz to 1.28Khz measured on prototype)
- Soft Start: from 0-100% (or to set speed) over aboout 1s
- Mosfet gate rise and fall times: 1.5µs & 1.6µs respectively