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Simple Audio Frequency Signal Generator Circuit

Have anyone ever thought that how electronic makes sound?

Audio frequency signal generator it like small sound maker.

It make electric signal what ear can hear from low boom (20Hz) to very high squeaky (20kHz).

This circuit very helpful for many thing:

Circuit Working:

Parts List:

ComponentQuantity
Resistors
1k 1/4 watt2
820Ω 1/4 watt2
Capacitor
Ceramic 0.22µF1
Semiconductors
SCR C1061
Mini Speaker 8Ω1

This circuit uses one thyristor, two resistor, one capacitor and small speaker to make signal.

When power is turn ON current go through R1 and turn on thyristor.

Then thyristor let current pass and start charging capacitor C1.

But as C1 charge more charging current go down slowly and when current gets too low thyristor turn OFF.

After that C1 empty itself through R2 and whole thing start again.

Thyristor keep turning ON and OFF like this and that make signal go up and down.

How fast it do this (frequency) depend on C1 and R2.

Formula:

Formula for Estimating Frequency:

The following formula may be used to approximate the frequency (f) of oscillation in such a circuit:

f = 1 / 2 * R * C

where,

If one uses SCR C106 and one RC trigger setup this formula give good start to make and understand sound signal circuit.

But real parts not always perfect so maybe need small change in value to make it work good in real life.

How to Build:

To build a Simple Audio Frequency Signal Generator Circuit following steps are required for connections:

Get All Parts:

Make Circuit Plan:

Put Thyristor (SCR):

Add Resistor R2:

Put Capacitor C1:

Connect Speaker or Buzzer:

Add Power:

Test the Circuit:

Be Safe:

Note:

Conclusion:

This Simple Audio Frequency Signal Generator Circuit can be simple or complex.

Some use just few parts like resistor and capacitor.

Some use big chips or microcontroller for smart work.

People use these circuits a lot for sound testing, fixing electronics or fun hobby project where sound signal needed

References:

Signal generator

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