2019-September-16 at 14:53 #6149
LectronFan
Moderator

    Hi Michael,

    I’ve got some good news for you ! If you look at the circuit above, you’ll spot a 10K potentiometer at the top.

    This acts as a pitch control which brings us to the next topic : 2-tone oscillator.

    Here’s the circuit :

    2-tone generator

    We will add a few more blocks to the circuit and now we can generate a different tone by pressing the switch. You notice that we add a resistor by pressing the switch. By turning the potentiometer we can change the difference between the two tones and also the pitch.

    Careful readers might have noticed that we have here a so called VCO (Voltage Controlled Oscillator).

    By changing the DC bias of the first transistor, we’ll also change the amplification factor. This results in a change of pitch at the feedback circuit.

    Thanks to this fact and also the fast Lectron system we will create a lot of cool circuits.

    These will be published soon.

    Till then

    • This reply was modified 5 years, 7 months ago by Michael.
    • This reply was modified 5 years, 7 months ago by Michael. Reason: Changed font and size styling for easier reading