Space gun BA546
Electronic
LM324

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		LS1		SPEAKER
	1		ON		OFF
	1		S1		BUTTON