ProMax PSG01-A PWM Signal Generator with Encoder potentiometer

 Specifications

• Operating Voltage: 3.3V – 30V DC (Wide range input)
• Frequency Range (Normal): 1Hz – 150kHz
• Frequency Range (Fine): 1Hz – 15kHz (High precision mode)
• Duty Cycle: 0 – 100% (1% steps in Normal, 0.1% in Fine)
• Output Amplitude: Equal to Input Voltage (V-pp)
• Output Current: 5 – 30mA (Direct drive for LEDs/Optocouplers)
• Control Interface: Rotary Encoder with Push Button
• Dimensions: 79mm x 42mm x 24mm
• Panel Cutout: 72mm x 40mm

Features:

• Can generate adjustable PWM Signals. Duty cycle and Frequency of Output can be varied through the onboard encoder potentiometer
• Two modes: Normal Mode and Fine Mode
• Real Time Update through Display
• High Precision Output wave 
• Panel Mounting for easy installation in control panel, enclosure, surface mounting, etc
• High Contrast Display 
• Settings are stored through Power Cycle. Great for set-and-forget operations.
• 1 channel PWM output
• Operating Voltage: 3.3 to 30v
• The output PWM Amplitude is the same as the input voltage

Applications

• Can be used to generate PWM Signals for testing, debugging and simulating sensors
• Can be used to generate input speed control signals for Motor Drivers, Valve Controllers, PLCS, etc
• Used to drive the stepper motor driver’s square wave
• Used as a signal source or excitation source for testing
• Widely used in production processing and industrial applications

Project Evolution

• From: Using a basic 555 Timer IC with difficult-to-calculate resistor values.
• To: Digital, instant frequency adjustment with the ProMax PSG01-A.
• Capabilities Unlocked: You can now perform Dynamic Load Testing. Instead of a fixed signal, you can sweep through frequencies in real-time to find resonance points in stepper motors or cutoff frequencies in filters.
• Effort Level: Beginner – No coding required.
• Hardware Needed: Just a DC Power Supply (12V/24V recommended).

Wiring & Virtual Technician

• ⚠️ Critical Warning: The output voltage amplitude matches your input voltage. If you power this with 24V, the PWM output will be 24V. Probots™ Logic-Safe 
• Advice: If connecting to a 3.3V microcontroller (like ESP32/STM32) or 5V Arduino, ensure you power the generator with that same logic voltage, or use a level shifter to prevent frying your GPIO pins.

Pinout:

• V+ : Power Supply Input (3.3V - 30V)
• V- : Ground (Common)
• PWM: Signal Output (Square Wave)
• GND: Signal Ground

Package Includes:

• 1 x ProMax PSG01-A PWM Signal Generator with Encoder potentiometer 

Technical FAQs

• What is the maximum output current of the PWM pin?
  The pin can source roughly 5-30mA. It is designed to drive logic gates, optocouplers, or MOSFET gates, not motors directly.
• Can I drive a DC motor directly with this module?
  No, the current is too low. You must connect the PWM output to a Motor Driver Module (like an L298N or IBT-2).
• Does it remember my settings after power loss?
  Yes, the module has non-volatile memory. It will resume the last set Frequency and Duty Cycle upon power-up.
• How do I switch between Normal and Fine mode?
  Long press the rotary encoder button for 5-10 seconds to toggle between modes.
• What is the difference between Normal and Fine mode?
  Normal mode goes up to 150kHz with 1% duty steps. Fine mode is limited to 15kHz but allows precise 0.1% duty cycle adjustments.
• Can I power this with a 9V battery?
  Yes, 9V is well within the 3.3V-30V operating range.
• Is the output signal pure sine wave or square wave?
  This unit generates a Square Wave (Digital PWM) only. It cannot generate Sine or Triangle waves.
• Can I adjust the amplitude (voltage) of the output signal?
  No, the output amplitude is tied to the input voltage. To change amplitude, you must change the supply voltage.
• Will this work with a 3.3V ESP32?
  Yes, but you MUST power the generator with 3.3V to ensure the output signal is safe for the ESP32 pins.
• How do I connect this to a Stepper Driver (TB6600)?
  Connect PWM+ to the PUL+ (Pulse) input on the driver, and GND to PUL-. Set the Duty Cycle to 50% and vary Frequency to change speed.
• Does it have reverse polarity protection?
  It has basic diode protection, but we strongly recommend double-checking V+ and V- before powering on to avoid damage.
• Can I use this to dim a 12V LED strip?
  Yes, if you use this module to switch a MOSFET (like IRF520) that controls the LED strip.
• What is the frequency accuracy?
  The accuracy is approximately ±2%. For standard industrial control and motor driving, this is more than sufficient.
• Does the display show the actual output or just the set value?
  It displays the set value. However, since it is a digital generator, the output matches the set value instantly.
• Can I lock the settings so they aren't changed accidentally?
  There is no software "lock" function, but the rotary encoder requires a deliberate turn, making accidental changes unlikely.
• Is the screen backlit?
  Yes, it features a high-contrast LCD with a blue/white backlight, readable in dark control cabinets.
• What connectors does it use?
  It uses screw terminal blocks for secure wire connections, suitable for 22-18 AWG wire.
• Can I mount this on a DIN rail?
  Not directly. It is designed for panel mounting. You would need a separate "Panel to DIN Rail" adapter bracket.
• Why is my servo motor jittering when using this?
  Ensure you have set the frequency correctly (usually 50Hz for standard servos) and are adjusting the duty cycle (pulse width) within the servo's range (typically 5-10%).
• Is this product waterproof?
  No, the front face is splash-resistant, but the back is open. It should be mounted inside a water-tight enclosure for outdoor use.