miniature audio oscillator circuit

Posted on Feb 5, 2014

This circuit is designed as a pocket sized high performance audio oscillator. This circuit can operated using battery operated version was possible and could be made at very low cost as well by using one quad op-amp to provide the entire active circuitry. This is the complete figure for design circuit. In the figure, there are only two control pot

miniature audio oscillator circuit
Click here to download the full size of the above Circuit.

s (RV1 and RV2) and two DPDT switches. The output level pot includes an on-off switch and is of logarithmic taper to allow easier setting at low (i. e. millivolt) levels. This pot is directly coupled to A4s output to minimize response errors, provided that the load impedance is constant or quite high compared to the output impedance provided by Miniosc. The frequency sweep control (RV1A/B) has a range of about 24:1 and in combination with the High-Low range switch having a 18:1 ratio, the audio band is covered (with the exception of the lowest octave) in two overlapping ranges. The possibility of a single sweep of the audio band without the range switch was tried out and later dropped in preference to the present design. Types like the TL074, TL084, LF347 and LF444 and other quad op-amps with compatible pin outs are not recommended for use due to both the increased battery drain and reduced margin of minimum operating voltage. The TL064 is alone in having operation specified down to a plus and minus 3 volt supply. [Schematic`s circuit source: Phill Allison Notes].

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Hot Springs Reverb
    PC terminal using a TV
    Reasonable Car Battery Charger
    Design a Unipolar Stepper Motor Controller/Driver and
    combination lock in electronic
    10 band graphic equalizer schematic
    mobile phone battery charger circuit
    6N7 Tube QRP Power Amplifier
    Decreasing intermod on the Kenwood TM-733 receivers
    Press light switch double circuit 9