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  1. A

    Creating a varriable wien bridge oscillator

    I had built the oscillator and now I want to drive it using a speaker . So i Had used an emitter follower . BUt somehow the speaker is giving a very reduced voice output. How do i increase the power more
  2. A

    Creating a varriable wien bridge oscillator

    I tried it but somehow it ket attenuating. Also since I do not have an incandescent lamp so I use diodes for amplitude stabiisation
  3. A

    Creating a varriable wien bridge oscillator

    I wanted to know whether I could develop an oscillator using an LM386
  4. A

    Creating a varriable wien bridge oscillator

    But if i want to do it with LM386 what approach should i take.
  5. A

    Creating a varriable wien bridge oscillator

    i DID it using OP07 op amp and it works well within the audio range
  6. A

    Creating a varriable wien bridge oscillator

    I had been trying to build a variable wien bridge oscillator . The schematic is shown below . I wanted to change the frequency by using a pot . But it starts to distort after 12 Khz. Also when i am reducing both the capacitors to 1 nF I find the waveform to be triangular more than sinusoidal...
  7. A

    Mains noise problem and reduced sensitivity

    Can i use a 220 ohm resistor in place of a 180 ohm resistor
  8. A

    Mains noise problem and reduced sensitivity

    These are some of the modifications that I did in the circuit . But i am still getting acoustic howling. What can I do to prevent it dynamically. Also I want to increase the sensitivity to the extent that when I rub my fingers in front of the electret mic the speaker should be able to play it .
  9. A

    Mains noise problem and reduced sensitivity

    THE pins 1 and 5 are connected for Bass Boost. Further I observed that if I disconnect pins 1 and 5 then a sharp shrill sound is produced. Why do I need to put the 10ohm resistor in series with the capacitor ?
  10. A

    Mains noise problem and reduced sensitivity

    Yeah its 100 nF
  11. A

    Mains noise problem and reduced sensitivity

    No. The led is just used to check the intensity of the signal entering through the mike
  12. A

    Mains noise problem and reduced sensitivity

    I had tried to build an audio amplifier using a preamp build out of a transistor and thereafter using lm386 for the audio amplifier. I had received a suitable response using an earphone. But when I use an 8 ohm 0.5 speaker the audio output gets distorted and also the sensitivity reduces. Also I...
  13. A

    Mains noise problem and reduced sensitivity

    I had tried to build an audio amplifier using a preamp build out of a transistor and thereafter using lm386 for the audio amplifier. I had received a suitable response using an earphone. But when I use an 8 ohm 0.5 speaker the audio output gets distorted and also the sensitivity reduces. Also I...
  14. A

    Mains noise problem and reduced sensitivity

    I had tried to build an audio amplifier using a preamp build out of a transistor and thereafter using lm386 for the audio amplifier. I had received a suitable response using an earphone. But when I use an 8 ohm 0.5 speaker the audio output gets distorted and also the sensitivity reduces. Also I...
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