Rain sound effect Generator by 4060

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Agreeable, relaxing effect, helping to fall asleep
Small portable unit, 3V battery powered

Sound effects generators trying to imitate rain sound or sea surf are well known to hobbyists from many years: their purpose is to induce relaxation and sleep or to help in concentration and study.
The sound generated is restrained to a background level and these devices are frequently kept on the night table.
Common designs use invariably Zener diodes or reverse-biased transistors base-emitter junctions as white noise generators. The main snag of these circuits is that a supply of at least 12V is required, therefore a big battery pack or (more commonly) mains supply is used as power source.
The aim of this project was to design a small, portable unit, powered by a 3V battery and capable of shutting-down after a preset delay, in order to save power.

Parts:

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______100ÂµF 25V Electrolytic Capacitors
C2,C3,C6______100nF 63V Polyester or Ceramic Capacitors
C8,C10________100nF 63V Polyester or Ceramic Capacitors
C5_____________47ÂµF 25V Electrolytic Capacitor
C9_____________10ÂµF 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)

Read More Source:
http://www.redcircuits.com//Page75.htm
Thank you.

This entry was posted on Sunday, February 3rd, 2008 at 2:04 pm . You can follow any responses to this entry through the RSS 2.0 feed.

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