Scream Generator Circuit

Scream generating circuit? Well actually this is a simple sound generator circuit, but of course, you can create a screaming sound with it. It has unlimited possibilities in pranks and Halloween, just use your imagination. It works like a car horn or a doorbell but intensity increases the more you keep it pressed. It produces a small sound at first and turns into a high pitched sound; like a scream!


This is a real scream generator circuit suitable for any purpose like an alarm or car horn. The circuit is based on two transistors Q1 and Q2. When you press the switch S2 the siren starts up moving to a high frequency. When the switch is released the tone slips down until you shift it up again by pushing the switch S2.

Sound Generator Circuit Diagram with Parts List.

Tone/Sound Frequency Generator Circuit
Scream Sound Generator Circuit


  • Speaker – 1 nos
  • Capacitor 30uF – 1 nos
  • Capacitor 0.02uF – 1 nos
  • Switch – 1 nos
  • push button switch – 1 nos
  • Resistors – 3 nos
  • Transistors – 2 nos


  • Adjustment of tone quality can be obtained by different values for C2.
  • If the alarm oscillates before S2 is pressed. The transistor is leaky, replace it.
  • S1 can be used as a power switch.

We have more Sound Generator circuits that you may like to read; Take a look down:

1. Police Siren

2. Ding Dong Sound Generator

3. Canary Chirp Generator

4. Water Activated Musical Bell

5. Doorbell Circuit


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