low frequency oscillator


Posted on Feb 7, 2014

The circuit is a standard RC phase shift oscillator using a single bipolar transistor as the active element. When power is applied regenerative feedback is applied via C2 from collector to base of the transistor. The timing components, R1, R2, C1 and C3 dictate the oscillation frequency. In use preset RV1 is adjusted so that oscillation just begins


low frequency oscillator
Click here to download the full size of the above Circuit.

. With values shown full amplitude oscillation takes about 4. 8 seconds (see diagram below). This oscillator is designed and simulated on LTSpice IV. Once simulated click the "probe" cursor on the output wire "Vo", the above waveform is produced. To calculate the frequency, place your mouse on the graph where oscillations have reached full amplitude and draw a rectangle, ensuring maximum and minimum amplitude is enclosed within the rectangle. The diagram below shows such a zoomed portion of the output waveform, starting around 5. 6 seconds into the simulation. To add cursors left click on the name of the output waveform, this is called "V(vo)". A single cursor is added to the graph which can be moved with the mouse or keyboard arrows. Now right click the mouse on the Vvo waveform. In the window that appears click on the attached cursor menu and change to "1st & 2nd". Now two cursors will be visible and controllable. Make sure both cursors pass through the zero volt horizontal meridian and measure one output cycle. A sub window allows you to read the value as shown above, for this oscillator the time for one cycle is 127. 2ms and frequency a little under 8Hz.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Audio Mixer with 2N3819
    MSP430 Ultra-Low Power 16-bit Microcontroller
    Many space impulses generating circuit on the basis of one-chip computer and CPLD
    power inverter circuits
    Most simple FM transmitter circuit diagram
    Good vibrations for energy harvesting
    stepper motor tester
    Active Audio Tone Control Circuit Design
    Room Recorder
    USB Switch For Printers
    Optical attenuation control circuit
    FM radio tuning circuit circuit



    Top