VikramR3/DC_Motor_Speed_ControllerNE555 PWM speed controller with TIP122 low-side switch - KiCad 9, 2-layer, 61.5 x 37.2 mm
DC Motor Speed Controller is an open-source printed circuit board by VikramR3, from the VikramR3/DC_Motor_Speed_Controller repository on GitHub, published under the MIT licence. It is a 2-layer board of 61.5 × 37.3 mm with 19 parts on 11 nets, routed with 67 tracks and 0 vias.
It is built around the NE555P and TIP122. Its parts include 4 diodes, 3 capacitors, 3 resistors, 2 connectors and 1 IC. It belongs with the robots and motor control boards of this library.
A 2-layer PCB that varies the speed of a brushed DC motor by PWM: an NE555 astable whose duty cycle is set by a 100 kΩ potentiometer, driving a TIP122 Darlington as a low-side switch. Designed in KiCad 9.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 1N4007 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1, D2, D3 |
| 2 | 100nF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C1, C2 |
| 2 | 1k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R1, R2 |
| 2 | Screw_Terminal_01x02 | TerminalBlock:TerminalBlock_MaiXu_MX126-5.0-02P_1x02_P5.00mm | J1, J2 |
| 1 | 1000uF | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C3 |
| 1 | 100k | Potentiometer_THT:Potentiometer_Alps_RK163_Single_Horizontal | RV1 |
| 1 | 2.2k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R3 |
| 1 | LED | LED_THT:LED_D5.0mm | D4 |
| 1 | NE555P | Package_DIP:DIP-8_W7.62mm | U1 |
| 1 | TIP122 | Package_TO_SOT_THT:TO-220-3_Vertical | Q1 |
The 15 most common of 19 parts.
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A 555-timer-based DC motor speed controller designed in KiCad — uses a variable-duty-cycle PWM signal driven through a power transistor to control motor speed with a single potentiometer.
It measures 61.5 × 37.3 mm and has 2 copper layers, 1.6 mm thick.
19 parts, built around the NE555P and TIP122. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the VikramR3/DC_Motor_Speed_Controller repository on GitHub, at the commit this page was made from: the board is DC_Motor_Speed_Controller.kicad_pcb and its schematic DC_Motor_Speed_Controller.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
