PINK NOISE GENERATOR K4301 phone h a micro nce.
VELLEMAN NV Legen Heirweg 33 9890 Gavere Belgium Europe www.velleman.be www.velleman-kit.
Features & Specifications To analyse the acoustic properties of a room (usually a living- room), a good pink noise generator together with a spectrum analyser is indispensable. Moreover you need a microphone with as linear a frequency characteristic as possible (from 20 to 20000Hz.). If, in addition, you dispose of an equaliser, then you can not only check but also correct reproduction. Features: Random digital noise. 33 bit shift register. Clock frequency adjustable between 30KHz and 100KHz.
Assembly hints 1. Assembly (Skipping this can lead to troubles ! ) Ok, so we have your attention. These hints will help you to make this project successful. Read them carefully. 1.1 Make sure you have the right tools: A good quality soldering iron (25-40W) with a small tip. Wipe it often on a wet sponge or cloth, to keep it clean; then apply solder to the tip, to give it a wet look. This is called ‘thinning’ and will protect the tip, and enables you to make good connections.
REMOVE THEM FROM THE TAPE ONE AT A TIME ! DO NOT BLINDLY FOLLOW THE ORDER OF THE COMPONENTS ONTO THE TAPE.
Construction 1. Jumper wire 3. Resistors 5. PCB tabs V GND OUT R... J 2. Diodes. Watch the polarity ! CATHODE D1 : 1N4148 D2 : 1N4148 D3 : 1N4007 D... R1 R2 R3 R5 R6 R7 R10 R11 : : : : : : : : 10K 100K 100K 47K 22K 10K 220K 1K 4. IC sockets. (check the position of 1 IC... IC1 : 14p IC2 : 14p IC3 : 14p 6 (1-0-3-B) (1-0-4-B) (1-0-4-B) (4-7-3-B) (2-2-3-B) (1-0-3-B) (2-2-4-B) (1-0-2-B) : 1X : 2X : 1X 6. Capacitors C...
Construction 7. Transistor 10. Capacitors. Watch the polarity ! T1 : BC547B C12 : 10µF C13 : 100µF C... 8. Voltage regulator Mind the orientation ! VR1 : UA78L08 VR... 11. ICs. (check the position of the notch) 9. Trimmer RV... RV1 : 220K 1 PIN 1 IC...
Test & adjustment 12. TEST & ADJUSTMENT RV1 RV1 1. SPECTRUM ANALYSER C2 C9 C8 C7 C6 2. C5 C4 3. OUT GND C13 9-12VAC 12-15VDC C12 R7 R9 D3 D1 D2 C10 VR1 IC2 IC3 R3 IC1 T1 R10 R4 C11 + R8 GND R11 R6 R5 + FIG 1.
Test & adjustment 1. Turn trimmer RV1 to its centre position. 2. Connect a power supply : AC, 9 to 12 V then between points GND and V. DC, 12 to 15 V (battery or power supply) then - to GND and + to V. 3. Connect the output (OUT, GND) to the input of a spectrum analyser, using a screened flex (screen to GND). Now adjust the noise signal using trimmer RV1 so as to obtain as flat a reproduction characteristic as possible.
Schematic diagram 13. Schematic diagram.
PCB 14.
VELLEMAN NV Legen Heirweg 33, B-9890 GAVERE Belgium (Europe) Modifications and typographical errors reserved - © Velleman nv.