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Rain sound effects generator introduction

2017-08-07 19:07  
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This article is rain sound effects generator introduction. The principle of combining text comprehension is a good suggestion. The principle is very simple but very practical and effective. The rain sound effects generator is pleasant, relaxing effect, help sleep. Small portable devices, 3 v battery powered. Figure: two BIFET amplifiers as a good, low-voltage supply, very low current, white noise source. A sound like a shower is to copy the speaker is magnified Q2. The higher part of the spectrum of the white noise is attenuated by the C8, slowly driven into operation by the field effect transistor Q1 acts as a variable resistor. Accordingly, an automatic gain tone control. Provides all timing IC2: it is turned on automatically reset, shut down the generator three kinds of delay time, selected via SW1. It also provides through R8, the slow charging and discharging C5, high frequency attenuation to change smoothly. The third is used as a DC generator circuit  switch . Q4 and Q5 are its drivers. In the circuit can be selected by changing the different operating delays and / or C10 value of R16 "is given. 4060, some manufacturers can not supply ICs swing in 3 v If the operation of a fixed delay is ideal, can be omitted and R14 SW1 and D1 anode may be hard-wired to the appropriate pin of IC1. output level can be increased to about 47 k R9 lower value on the other hand it reduces to approximately 150 k R9 value unnecessary if the variable high-frequency attenuation, C5 , C8, Q1 and R8 may be omitted if the car park is not needed, omissions, R12, R13 R11, R14 third and fourth quarters, Q5, C9, D1, and SW1, connected to pin 12 of IC2 # negative ground. If only a simple white noise generator is required, the omission is IC2, R15, R16 "is given, in addition to the above-listed part C10. Closed, the circuit can be re-opened, then closed again SW2. 


Rain effect Generator



R1,R2,R13______10K   1/4W Resistors
R3,R5__________33K   1/4W Resistors
R4,R6___________1M   1/4W Resistors
R7____________100R   1/4W Resistor
R8____________330K   1/4W Resistor
R9____________100K   1/4W Resistor
R10____________47R   1/4W Resistor
R11_____________1K   1/4W Resistor
R12____________15K   1/4W Resistor
R14____________47K   1/4W Resistor
R15____________10M   1/4W Resistor
R16_____________1M8  1/4W Resistor

C1,C4,C7______100μF   25V Electrolytic Capacitors
C2,C3,C6______100nF   63V Polyester or Ceramic Capacitors
C8,C10________100nF   63V Polyester or Ceramic Capacitors
C5_____________47μF   25V Electrolytic Capacitor
C9_____________10μF   63V Electrolytic Capacitor

D1___________1N4148   75V 150mA Diode

Q1___________2N3819   General-purpose N-Channel FET
Q2____________BC337   45V 800mA NPN Transistor
Q3____________BC327   45V 800mA PNP Transistor
Q4,Q5_________BC547   45V 100mA NPN Transistors

IC1___________TL062   Low current BIFET Dual Op-Amp
IC2____________4060   14 stage ripple counter and oscillator IC (See Notes)

SW1____________1 pole 3 ways Rotary Switch
SW2____________SPST  Slider Switch

SPKR___________8 Ohm Loudspeaker (40 to 85mm. diameter)

B1_____________3V Battery (two AA or AAA cells wired in series etc.)




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