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Project #PC59

Variable Oscillator PC

OBJECTIVE: To view the output of an oscillator circuit.

Build the circuit and try the

settings

shown. Move the adjustable

resistor lever to change the pitch of the sound and pulse

separation in the waveform.

Settings

Project #PC60

Connect the whistle chip across points A & B, then B & C, then D & E and

observe how the waveform changes as the sound changes. Sometimes

the speaker sound and waveform are unchanged, but the whistle chip

itself makes new sound.

Project #PC61

Remove the speaker. Connect the PC

interface cable across the whistle chip

and install the whistle chip across

points A & B, then B & C, then D & E

and observe how the waveform

changes as the sound changes. Try

different settings of the adjustable

resistor. The waveform for A & B is

shown.

Variable Oscillator

PC (III)

Variable Oscillator

PC (II)

Project #PC62

Replace the 100K

resistor R5 with the photoresistor RP, wave your hand or

a piece of paper over it and observe how the sound and waveform change.

Variable Oscillator

PC (IV)

CI-73_REV-E_051314.qxp_CI-73_Manual_072213 5/13/14 4:01 PM Page 53

Содержание CI-73

Страница 1: ...ll rights reserved No part of this book shall be reproduced by REV E Revised 2014 753293 any means electronic photocopying or otherwise without written permission from the publisher CI 73_REV E_051314...

Страница 2: ...ndows may give you a warning but our software is safe to download Go to the download and extract the compressed files Connect the plug end of our cable to the microphone input or microphone USB adapte...

Страница 3: ...the following 2 pictures depending on whether your microphone input is properly turned on If you get the picture shown in Example B then your microphone input is not properly turned on Go to the Turn...

Страница 4: ...ndows versions you must plug in the PC interface cable before you run Winscope or you will not be able to activate the Winscope on line button Looking at Electronic Signals using the WINSCOPE Software...

Страница 5: ...he volume set too high may clip off the top or bottom portion of a waveform B The oscilloscope waveforms shown on your display may appear upside down inverted from those shown throughout this document...

Страница 6: ...rom the PC interface cable picking up energy from other electronic instruments in the vicinity including room lights and your computer hence it cannot be avoided Limitations of WINSCOPE and Its Interf...

Страница 7: ...44 PC37 Adjustable Tone Generator PC IV 44 Project Description Page PC38 Adjustable FM Radio PC 44 PC39 Transistor AM Radio PC II 45 PC40 Playback Record PC 45 PC41 Power Amplifier Playing Music PC 4...

Страница 8: ...nics It is recommended that you already be familiar with the Snap Circuits parts and assembly methods from the other manuals Build the circuit shown and connect the PC interface cable to the microphon...

Страница 9: ...the Hold button to freeze the waveform on the screen then click on On Line to restart 8 Click on the On Line button if Winscope is currently in Hold mode and you should get a picture similar to this o...

Страница 10: ...Trigger positive level button 9 Notice that the waveform seems to be randomly dancing across the screen making it hard to study We can fix this Click on the trigger positive level button and make sure...

Страница 11: ...d in frequency Move your computer mouse directly over the first peak the software displays the frequency you are pointing at Move the mouse to the other peaks and you see they are multiples of the fir...

Страница 12: ...hest in voltage your results may vary Horizontal scale 11 Now you can click on the FFT box to return to oscilloscope mode and look at the waveform with the 0 1mF capacitor in the circuit You can obser...

Страница 13: ...part RV around to change the waveform and the sound A sample waveform is shown here but the pattern and shape of the pulses depends on the adjustable resistor setting Waveform On Line button Without...

Страница 14: ...settings shown here Moving the adjustable resistor lever will change the spectrum shown You can also use storage mode when in FFT mode so turn it on now Storage mode In this way you can show the peak...

Страница 15: ...utton to activate and turn on the switch snap part S1 Set Winscope to the settings shown on the right and move the lever on the adjustable resistor snap part RV around to change the waveform and the s...

Страница 16: ...ode Now change the color of the Y1 trace Move the adjustable resistor control lever a little then press On Line once to record another waveform Now change the color of Y1 again Move the resistance con...

Страница 17: ...circuit that makes alarm sounds Light Sounds PC Build the circuit and connect the Winscope PC interface cable as shown the cable should still be connected to the microphone input on your computer CI 7...

Страница 18: ...due to variations in the microphone input designs between computers See the notes on page 4 for details On Line button Set up Click on the FFT button to look at the frequency spectrum Also set the amp...

Страница 19: ...n pitch and gives a clear spectrum that slowly rises and falls in frequency Project PC6 Light Sounds PC III Remove the connection between T and U and then make a connection between U and Z It makes an...

Страница 20: ...tinuing from the previous experiment then close the Winscope program and run it again to reset the settings Click on the On Line button to activate and turn on the switch snap part S1 If you press the...

Страница 21: ...the microphone Words produce a more random pattern than humming but less random than blowing into the microphone The waveform at left is an example of talking into the microphone Observe the waveform...

Страница 22: ...led by humming like you did for the AM you don t have the parts needed to do this Look back at the Light Sounds project PC4 on page 16 It shows several different ways of configuring the alarm IC to ma...

Страница 23: ...set the adjustable resistor snap part RV to a comfortable volume The integrated circuit snap part U5 detects and amplifies the AM radio waves all around you The power amplifier IC snap part U4 drives...

Страница 24: ...other examples of talking and music using the same settings above On Line button 1 1 mode Click on the FFT button to look at the frequency spectrum Set the time scale really frequency scale in FFT mo...

Страница 25: ...turn on the switch snap part S1 Click on the On Line button to activate Press the press switch snap part S2 several times to step through the eight different sounds from the space war integrated circu...

Страница 26: ...ht different sounds from the space war integrated circuit Hold it down for a few seconds each time so you can see the frequency spectrum representing the sound you hear Here are sample spectrums from...

Страница 27: ...microphone Ahhhhhh sound Humming into microphone Click on the FFT button to look at the frequency spectrum for these signals Try the amplitude and time scales shown here to start but your best setting...

Страница 28: ...n causes the speaker to create a small electrical signal just like a microphone does though not very efficiently since speakers were not designed to be microphones 27 Connect the PC interface cable di...

Страница 29: ...n it again to reset the settings Click on the On Line button to activate and turn on the switch snap part S1 Press the press switch S2 and wave your hand over the photosensitive resistor RP Due to the...

Страница 30: ...it will resume Settings Click on the 5ms div time scale button and on the FFT button to look at the frequency spectrum for the signal The Y1 gain control is set for high gain now so the higher peaks a...

Страница 31: ...ch snap part S1 Try the settings shown here The oscilloscope display alternates between 2 waveforms the one shown here and the one on the next page This one shows some pulses followed by a flat signal...

Страница 32: ...lar shape shown here This is the spectrum for the oscilloscope waveform shown at the top of this page which has a continuous series of pulses There are only pulses there with no transition between pul...

Страница 33: ...w uses the same settings and shows the waveform just before the sound stops You see the pulses slowly spread out as the tone of the sound changes Settings Now change to FFT mode to look at the frequen...

Страница 34: ...re Settings Wait mode On Line button You can also activate Wait mode and press the On Line button several times to view one scan of the signal at a time instead of seeing continuous scans Turn on FFT...

Страница 35: ...tivate A sample waveform is shown here The actual waveform will vary depending on how much light is shining on the photoresistor snap part RP If you cover the photoresistor then the circuit shuts off...

Страница 36: ...0 1mF capacitor to compare its spectrum A sample is on the left with the same Winscope settings as above As with the oscilloscope mode its spectrum is weaker and more erratic Settings Project PC22 Tro...

Страница 37: ...sample waveform is shown here Settings Note that in the above display the Y1 Gain is set high to show the low energy levels of the higher frequency components of the signal even though the stronger pe...

Страница 38: ...nd to change the waveform and the sound At some positions there may be no sound A sample waveform is shown on the upper right You can also change to the 0 5ms div scale to take a closer look at one of...

Страница 39: ...snap part S2 Set Winscope to the settings shown on the upper right A sample waveform is shown on the upper right Settings Turn on FFT mode to look at the frequency spectrum try the settings shown here...

Страница 40: ...wn here Settings Modify the circuit for project PC25 by placing the 0 02mF capacitor C1 on top of the whistle chip WC Look at the waveform and frequency spectrum using the same settings as for project...

Страница 41: ...t Winscope to the settings shown on the upper right Turn the motor snap part M1 slowly with your fingers and watch the waveforms generated They are very erratic and unpredictable A sample is shown on...

Страница 42: ...at the same settings shows the siren when it has almost faded out The waveform has become weak and sometimes erratic Turn on FFT mode to look at the frequency spectrum try the settings shown here The...

Страница 43: ...oo high for the microphone input stage on your computer and is being distorted You may sometimes correct for this if you like by reducing the volume control of your microphone input see p 3 but it is...

Страница 44: ...orm Press the switch S2 to change the sounds and waveform Project PC34 Adjustable Tone Generator PC Build the circuit shown and try the settings below Move the adjustable resistor lever to change the...

Страница 45: ...ctrum using the same settings as for project PC34 and wave your hand over the photoresistor to change the sound and pattern There will not always be sound Turn on the slide switch S1 and press the R b...

Страница 46: ...ow the output of an AM Radio 45 Build the circuit shown Turn on the slide switch S1 you hear a beep signaling that you may begin recording Talk into the microphone X1 up to 8 seconds and then turn off...

Страница 47: ...p to 8 seconds and then turn off the slide switch it also beeps after the 8 seconds expires Press the switch S2 for playback It plays the recording you made followed by one of three songs If you press...

Страница 48: ...r amplification is distorting the sound Flat edges Project PC42 Music Meter PC OBJECTIVE To show how high amplification can distort Use the LOW or 10mA setting on the meter M2 Set the adjustable resis...

Страница 49: ...ettings Time scale Delay Project PC44 Oscillation Sounds PC II Using the circuit from PC43 connect the whistle chip across points C D Notice how the shape of the pulse has changed from that shown in P...

Страница 50: ...n Settings Project PC48 Oscillation Sounds PC II Using the circuit from PC47 install the whistle chip on top of capacitor C1 Notice how the spacing between the pulses has changed Project PC49 Whistle...

Страница 51: ...oss points C D using a 1 snap the sound and waveforms are different Project PC52 Whistle Chip Sounds PC IV Place the 470mF capacitor C5 on top of the 100mF capacitor C4 and connect the whistle chip ac...

Страница 52: ...the switch Settings Project PC56 Connect the whistle chip across points A B then B C then C D and observe how the waveform changes as the sound changes Project PC57 Remove the speaker Connect the PC i...

Страница 53: ...but the whistle chip itself makes new sound Project PC61 Remove the speaker Connect the PC interface cable across the whistle chip and install the whistle chip across points A B then B C then D E and...

Страница 54: ...F capacitor C2 with the 10mF capacitor C3 on the right to further lower the frequency of the tone You may try other settings to zoom in or look at the frequency spectrum Settings Project PC64 Replace...

Страница 55: ...time scale shown below shows this better this is an illusion caused by the way Winscope measures the signal The amplitude of the pulses is not really varying Winscope makes measurements using a 44kHz...

Страница 56: ...wires into a cup of water as per project 519 The waveforms and frequency spectrum you see will be similar to the resistors you drew just as the sounds are similar Project PC66 Drawing Resistors PC OB...

Страница 57: ...Sample waveform Settings Project PC68 Replace the 10KW resistor R4 with the 100KW resistor R5 Now you change the frequency by changing the resistance in the oscillator Electronic Noisemaker PC II Pro...

Страница 58: ...beled A B on the circuit layout connect the PC interface cable across the whistle chip Listen to the sounds and view the waveforms as you press the press switch Replace the 0 02mF capacitor C1 with 0...

Страница 59: ...larm IC combo circuit Project PC72 Space War Music Combo PC OBJECTIVE To view the output of the combined outputs from the space war and music integrated circuits Settings Build the circuit and try the...

Страница 60: ...PROPERTY DAMAGE OR PROFIT LOSS ARISING FROM USE OR INABILITY TO USE THIS SOFTWARE THERE IS NO GUARANTEE IMPLIED OR OTHERWISE TO THE FITNESS OF THIS OSCILLOSCOPE PROGRAM FOR ANY PARTICULAR PURPOSE THIS...

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