A simple voltage control oscillator (frequency synthesizer) circuit using CD4046 IC. The input voltage is controlled by 1 KOhm potentiometer connect to the 5 volt input. So by applying more voltage to the input resulting in high frequency sound otherwise low voltage input then lower frequency sound.
The power source not necessarily 5 volt USB - it can be batteries whichever most convenient for you.
The amplifier circuit please refer to: How to make homemade DIY guitar amplifier run on 5 Volt USB
1 week ago
Hello,
ReplyDeleteI have found this article really helpful.
Can I use a 10uF capacitor instead of 10nF ?
Thanks.
10uF is too big capacitance the vco will be slower and the sound will be low pitch
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