Posted on Jan 12, 2013

The NE5561 provides pulse-proportional drive and speed control based on de tachometer feedback. This simple switching circuit consists of transistor 2N4920 pnp with a commutation diode used to deliver programmed pulse energy to the motor. A frequency of approximately 20 kHz is used to eliminate audio noise. The de tach delivers 2.7 V/1000 RPM. Negative feedback occurs when this voltage is applied to the error amplifier of the NE5561.

Click here to download the full size of the above Circuit.

The duty cycle varies directly with load torque demand. The no-load current is = 0.3 A and full load is 0.6 A.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Wien bridge oscillator
    mobile incoming call indicator
    Frequency Modulator and Tuning Circuit
    Water tank overflow liquid level sensor alarm circuit
    TV antenna booster
    Precision Monostable Multivibrator Circuit
    arduino Glacial Communications
    Armstrong Oscillator using a crystal
    Precision VXO for Crystal Characterization & Matching
    FM Transmission and Reception