Space gun BA546


In this project, you are going to generate a sound of a space gun you often see in TV games. The sound will be "zip-whoosh." This sound is a little bit complex. When you say a sound is complex, it means having various frequency components.

Here, you will superimpose white noise over an 8-kHz tone, and superimpose this composite over a differential wave, in order to produce a "zip-whoosh" sound that gradually fades out. Do you know white noise. It is theoretically defined as a noise containing equal spectra for all frequencies.

When you finish wiring, turn power ON. Then press S1, the trigger switch for the space gun. Each time you press S1, you should hear the shooting sound of the space gun. U1A is an 8-kHz oscillator.

The 8-kHz output wave from the oscillator undergoes superimposing with the white noise generated from Q1, and the resultant composite is amplified in U1B.

On the other hand, C7 and R12 form a differentiating circuit, in which a differential wave is applied to the base of Q2 when S1 is pressed. This differential wave, and the composite (8 kHz + white noise) amplified in U1B, get mixed in Q2, and then travel through the speaker drive amplifier U2, so that the speaker produces the shooting sound of a space gun.

Bill Of Materials For Space gun
20 Resistors
Quantity: References Value
4 R1-R4 22k
2 R5, R15 470k
4 R6, R7, R9, R14 100k
1 R8 1k
1 R10 2K7
1 R11 330k
2 R12, R13 1M5
2 R16, R20 1M
1 R17 100
1 R18 47k
1 R19 10k
15 Capacitors
Quantity: References Value
2 C1, C5 0.001uF
2 C2, C8 0.1uF
1 C3 0.047uF
2 C4, C6 0.01uF
2 C7, C9 1uF
3 C10, C12, C13 10uF
1 C11 470pF
1 C14 100uF
1 C15 470uF
1 Integrated Circuits
Quantity: References Value
1 U1 LM324  
2 Transistors
Quantity: References Value
2 Q1, Q2 2SC945  
5 Diodes
Quantity: References Value
5 D1-D5 1N4148  
4 Miscellaneous
Quantity: References Value
1 + 9V  
1 ON OFF  








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