光控音效发生器电路

This unique circuit allows you to create many different sound effect outputs simply by moving your hands over a couple of light dependent resistors, by varying the intensity of incident light over the LDRs.

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发电机有两个不同的单元LDR，可控制声音突发振荡器电路。一个LDR控制音调，而另一个控制突发持续时间。所有你所要做的就是扫过LDR来产生各种声音。

B.asic Working Principle

为了产生不寻常的噪声，音调突发振荡器电路采用具有正反馈的556个定时器IC。556设备包括一对完全独立的555 IC，并且一个IC 555的输出控制我们操作中另一个的振荡周期或突发持续时间。

The discharge delay is the duration it requires for the voltage on C to decrease from 2/3 Vcc to 1/3 Vcc (tD). When the 555's flip-flop reaches 1/3 Vcc, it resets and permits C to charge between RA and RB. The charge time is the time required for C to charge to 2/3 Vcc (tc).

The 555's flip-flop sets as soon as this threshold of charge is achieved, causing C to discharge across RB, so that the cycle keeps repeating. The entire circuit for our light-controlled sound effect generator circuit is shown in Figure below.

您会发现使用了几种光电池或LDR：R8和R9。光电池基本上是电阻器，其幅度与其经受的照明量成比例。

The intensity of the light has an inverse relationship with its resistance. A standard LDR can decrease to 100 ohms in intense light, but it can quickly approach 500 kilohms during darkness.

如果我们替换下面的图形，通过光电图LDR，通过计算555可以产生的频率范围，可以确定最低和最高电阻值（100欧姆和500k），如下所示：

循环时间= 0.7（r_一种+R_B.)C +(0.7 x R_B.x C)

The duration of the operating cycle can be = 1.4 × RB x C in case RB is very minimal. If C is 0.1uF, the maximum cycle time duration for a frequency of 0.7 hertz is 700 milliseconds, while the smallest cycle time interval for a frequency of 5000 hertz is 0.2 milliseconds.

This circuit's power source must be capable of delivering between 5 V and 15 V DC, and this should be capable of delivering at approximately 1 amp at 5 volts. While the circuit is under no-load situations, the output must never surpasses 15 volts or the circuit will be damaged.

Circuit Description

Since the frequency and burst duration of the circuit are modulated by brightness, the circuit must be operated in an environment having abundant overhead light. S3 may be opened and closed to vary the tone burst function.

这要么直接将突发定时器的输出连接到色调振荡器的重置，或者与电阻R5转换直接连接，以实现完全新的声音效果。

通过解锁S2禁用突发功能，并且可以通过漂浮在R9上通过浮动来操纵清洁色调。重要的是要记住，影响LDR R8和R9的光量对于有效电路性能至关重要。

Since LDR sensitivity varies, one needs to adjust the light to the correct frequency range. If the modification isn't enough, you can change the values of timer capacitors C2 and C3 to increase the range of potential frequencies.

Different sound tones that can be generated

以下是您可以生产的不同声音效果的列表，以及如何做到的指导方针：

The sound of police sirens: Move up and down your right hand within 1 and 3 inches around R9 once each second with the 'TONE/BURST switch S2 set to tone.

旧的汽车已经开始: Set the HARD/SOFT switch S3 to hard and the TONE/BURST switch S2 to burst. Lift your left hand (or whichever hand is at R8) steadily over the LDRs using your right and left hands.

飞机起飞: Bring your right hand near LDR R9 and gently lift it. Set TONE/ BURST switch S2 to tone. Stop when you reach 2 inches.

一种liens have landed:Set the HARD / SOFT switch S3 to hard and the TONE /BURST switch S2 to burst.

Put your hands up over your head and gently place them upon that LDRs.

鸟的声音唧唧喳喳: Set the HARD/SOFT switch S3 to hard and the TONE/BURST switch S2 to burst. Placing your left hand 2 inches over photocell LDR R8 is a good idea. Open your right hand's fingers and move them across LDR R9 from about 2 inches away.

鬼魂的声音哀号：将硬/软开关设置为软，色调/突发切换到音调。在飘动它的同时将右手抬起在LDR R9之间。

弗兰肯斯坦声音有效T：将硬/软开关S3调整为软，色调/突发开关S2突发。把手放在头上并逐渐带来它们，直到LDR在距离距离。

将左手抬高到开关上方约3英寸，下一步落到约1英寸内。同时抬起右手3英寸。继续重复程序。

Nuclear radiation alert: Select the 'DONE/BURST' option. S2 is the second switch. Configure HARD/SOFT switch S3 to hard on burst. Curve your right hand 1 inch over LDR R9, subsequently 2 inches over LDR R8.

Foghorn警报声：Configure TONE /BURST switch S2 to burst and HARD /SOFT switch S3 to hard for foghorn sound effect. Put your right hand over LDR R9. Keeping your left hand over LDR R8 seems to be a good idea.

Smoke Detector Alarm:将音频/突发开关S2调整为突发和硬/软开关S3，以难以获得烟雾探测器警报声。r9应在右手3英寸，距离左手1英寸应距1英寸。

这种轻控制的音效发生器电路基本上是一个音乐设备，音频质量由表演者的人才和想象决定。如果您曾经想要构建一个可能产生独特音效的电路，则此电路项目仅适用于您。