Signal Consulting, LLC 

 Model Si50HyUdMC1-120V-32A

Single Channel, Open-Loop, Hybrid, Unidirectional, 120V 32A DC Motor Controller with Integrated Finned Heat Sink, 5kHz or 20kHz PWM, T-Chip





Buy this Product

 Si50HyUdMC1-120V-32A Features:
Power Semiconductors: Two 200A MOSFETs
Max. Continuous Current: 32A with Finned Heat-Sink (as shown).
Max. Current for 5 sec: 100A with Proper Heat-sinks
Board's Size: L=3.2", W=2.6",H=1.9" (8.12 x 6.6 x 4.82cm).
Overall Size (with Large Heat Sink): L=5.9", W=3.7",H=2.4"

Components Type: 100% Solid State, NO Relays  

  A single DC Motor or Load is controlled  by a Pulse Width Modulator (PWM).

 PWM carrier frequency is  user selectable with a jumper, 20kHz when the jumper is open and 5kHz when closed.

  The Load-Voltage is adjustable from 0V to 120V (or to Vp) in 120 steps  with an analog control signal or with an internal or external potentiometer.

  User can choose between slow or fast motor acceleration/deceleration modes.

High Power-Efficiency: 98.5% typical, at 120V and 32A

On Board:
Filter Capacitors
VTS diodes
Snubber Circuit Ready
Voltage Requirement:
A single DC Source Voltage (unregulated ) with any voltage value from 35V to 120V (for Vp)


 Si50HyUdMC1-120V-32A-3T1,  Spec Sheet  (PDF)

The Si50HyUdMC1-120V-32A is a 120V, 32A, microprocessor based, Single, Open-Loop, Hybrid, Unidirectional, Motor-Controller board that uses 5kHz or 20kHz pulse-width modulation (PWM) to efficiently control the speed of a brush type DC motor (or load  current ) in the 0 to 3840W power range, and in 32W steps. An onboard microprocessor generates a 5kHz or 20kHz PWM carrier signal, controls the load-power (or motor speed) and controls the load-current rate (or motor acceleration and deceleration). The PWM carrier frequency is user selectable by the jumper CN4, 20kHz when CN4 is open and 5kHz when short. The high frequency PWM rate provides a smooth speed control and insures a quiet motor environment. As the name hybrid (Hy) implies, the desired motor speed (or PWM pulse-duration) is set by a variable (0 to +5V) analog input-voltage VI1,G, providing a smooth motor-speed control from 0 to 100% in 0.833% steps; while the other control-signals are digital. This analog input (VI1,G) is zener-diode protected and includes an integrator with a time-constant of 0.01s; accordingly, this input can be driven with DC or PWM signals. A normally open switch (or an Open Collector npn Transistor) can be connected to jumper J1 (as shown below), J1 Open=Normal operation, J1 Short=Load is open. The active pin on J1 is pulled to +5V through a 4.7k Ohm resistor, while the other pin (G) is at ground. The user can choose between slow or fast motor acceleration/deceleration modes by short-circuiting or open-circuiting the pins labeled J2. The slow mode, with rise-time/fall-time of 0.5s, is selected by shorting J2 (J2 jumper installed); while the fast buildup mode, with rise-time/fall-time of 0.025s, is selected by leaving these pins open (no Jumper installed). An LCD port CN3 (with 9600 Baud RS232 Interface Standard) is provided for display of the Set and Measured Motor data. The LCD can be order Signal under the part number of Si14LCD2L16CH-3PC  (2-Line by 16-Char display with 12” cable and 3-pin connectors, and with back-light). An onboard LED (red) is used to monitor the load-voltage. A small (3.0”x4.0”x1.0”) finned heat-sink is provided to operate 3840W power level (or at 120V and 32A). Higher current level levels (50A at 120V or 6000W) can be achieved with more efficient heat-sinks (5” x 5” x 1.5” finned heat sink). This board requires a single 35V to 120V DC unregulated power source at a 0A to 32A current range to operate normally. Typical applications are: DC Motor-Speed Controller, Light-Dimmer with variable delay, Power Amplifier, SPST Solid State Relay, etc. This board can be configured and programmed to perform efficiently in many customized applications.

 A Typical Application of the Si50HyUdMC1-120V-32A

In this open-loop speed control application, the motor speed (or PWM pulse-duration) is linearly adjusted with the Si5Pot1-5k accessory (an external 1-turn 5kW pot); and efficiently controlling the motor power from 0 to 3840W in 32W steps. The DC Motor can be purchased from Bodine, ; or from other vendors, inexpensive, unregulated DC power supply is shown in this application drawing. A wide variety of linear and switching power supplies can, also, be used with this board. Consult the most recent catalog on to purchase these power supplies.

Warning:  The connecting wires to the Motor and the Power Supply must be heavy gauge copper wire (#10 AWG or heavier) to handle the rated current level. In addition, these heavy gauge wires act as a heat sink, protecting the board from overheating.


Si50HyUdMC1-120V-32A, Hybrid Unidirectional Motor Controller, 1 DC Load at 120V, 32A  
Price $249.00

Note: If Buying the Si50HyUdMC1-120V-32A, it is recommended that you buy one more accessories listed below.  

Si5Pot1-5k   1-Turn, Linear Taper, 5kW Potentiometer.
Price $15.00
Optional Si14LCD2L16CH-3PC  2 Line by 16 Character LCD with 12" long cable and 3-pin connectors.  
Price $59.00

Buy this Product

Availability: We usually ship in 2-3 business days.



All Products Are Proudly Made in the USA