Global Specialties

Global Specialties DC Motor Speed Control

SKU: 32GSK804

  • Sale
  • Regular price $10.95


This circuit allows the user to vary the speed of a DC motor from a stop position to maximum revolutions per motor specification.

Technical Specifications:

  • Power source: 12 VDC
  • Load voltage: 12 VDC, 1.5 A max.
  • Output: controlled DC motor by pulse width modulation
  • PCB dimensions: 1.76 x 1.32 inches

Operating Principles:

  • Integrated circuit oscillates the frequency at 264 Hz relative to resistors 1, 2, and 3, variable resistor 1 and capacitor 1.
  • VR1 provides adjustment of duty.
  • If the plus duty is more than the minus duty the motor will slow down.
  • Frequency will be transmitted through IC to resistor 4 and the base of transistor 1 making TR1 function as adjustment of VR1.