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-15-

QUIZ

1. The 9V battery supplies a . . .

A. positive AC voltage.
B. DC voltage.
C. AC voltage.
D. rectified DC voltage.

2. A human’s maximum thermal radiation is between . . .

A. 3 and 5

µ

m.

B. 9 and 13

µ

m.

C. 10 and 20

µ

m.

D. 9 and 10

µ

m.

3. As temperature changes, the pyroelectric crystals generate . . .

A. white light.
B. infrared light.
C. heat.
D. a voltage.

4. A wavelength is the distance between two points having . . .

A. opposite phases.
B. two different phases.
C. the same phase, but different voltages.
D. the same phase and voltage.

5. Infrared can be thought of as heat radiation because the . . .

A. electrical energy is transformed into heat.
B. radiant energy is transformed into heat.
C. mechanical energy is transformed into heat.
D. solar energy is transformed into heat.

6. What are the two inputs called in an op-amp?

A. non-inverting and inverting.
B. V

1

and V

2

.

C. V

EE

and V

CC

.

D. gates.

7. A high pass filter attenuates all signals . . .

A. between two frequencies.
B. below the critical frequency.
C. above the critical frequency.
D. with high amplitudes.

8. The formula for the closed loop gain is . . .

A. (R2 x R1)Vo
B. (R1/R2)Vi
C. (R2/R1)Vo
D. -(R2/R1)Vi

9. A low pass filter attenuates all signals . . .

A. between two frequencies.
B. below the critical frequency.
C. above the critical frequency.
D. with low amplitudes.

10. A filter with a high value in Q has a . . .

A. wide bandwidth.
B. narrow bandwidth.
C. long bandwidth.
D. attenuates less frequencies.

Answer

s:

1.B

,2.

D, 3.

D, 4.

D, 5.

B, 6.

A, 7.B

, 8.D

, 9.C

, 10.B

Содержание AK-510

Страница 1: ...lenco Electronics Inc All rights reserved Revised 2006 REV N 753010 No part of this book shall be reproduced by any means electronic photocopying or otherwise without written permission from the publisher Elenco Electronics Inc Assembly and Instruction Manual ...

Страница 2: ...W brown blue green gold 171600 CAPACITORS Qty Symbol Value Description Part 1 C8 500pF 501 Discap 225080 1 C9 01µF 103 Discap 241031 2 C2 C3 10µF 25V Electrolytic Lytic 271045 2 C4 C5 22µF 25V Electrolytic Lytic 272245 2 C1 C6 100µF 16V Electrolytic Lytic 281044 SEMICONDUCTORS Qty Symbol Value Description Part 1 D1 1N4148 Diode 314148 1 Q1 MPSA18 Transistor NPN 320018 1 IC1 LM324 Integrated Circui...

Страница 3: ...ir actual value printed on them Some capacitors may have their value printed in the following manner The maximum operating voltage may also be printed on the capacitor Second Digit First Digit Multiplier Tolerance The letter M indicates a tolerance of 20 The letter K indicates a tolerance of 10 The letter J indicates a tolerance of 5 For the No 0 1 2 3 4 5 8 9 Multiply By 1 10 100 1k 10k 100k 01 0...

Страница 4: ...Component Lead Solder Soldering Iron Drag Foil 1 Solder all components from the copper foil side only Push the soldering iron tip against both the lead and the circuit board foil 2 Apply a small amount of solder to the iron tip This allows the heat to leave the iron and onto the foil Immediately apply solder to the opposite side of the connection away from the iron Allow the heated component and t...

Страница 5: ...tower the pressure at the bottom of the tower can be quite high In order to keep a constant pressure in the water pipes that go to the houses the pressure must be lowered and held constant Consider the system shown in Figure 1 As people draw water into their homes the pressure on the low pressure side of the valve drops The spring pulls the valve arm inside the pipe up along opening the valve and ...

Страница 6: ...eat when it strikes a solid surface All solid bodies at a temperature above absolute zero emit thermal radiation As a body s temperature rises the shorter the resulting wavelengths become The human body s maximum thermal radiation is between 9µm and 10µm in the infrared stage Motion can be detected by special elements which are highly sensitive in the infrared range Such devices are called Pyroele...

Страница 7: ...capacitors The number of these components used and the way they are assembled determines the characteristics of the amplifier An amplifier that can perform many mathematical operations such as adding subtracting or multiplying voltages is called an Operational Amplifier or Op Amp The characteristics of an ideal op amp are the following A infinite voltage gain no voltage at all on the input control...

Страница 8: ...t and input voltages are of opposite polarity VOLTAGE COMPARATOR Operational amplifiers can be used to compare the amplitude of one voltage with another As a comparator its function is to determine when an input voltage exceeds a certain level When used as a comparator the op amp is used without feedback and at maximum gain One input is set to a reference voltage and the other tied to the input vo...

Страница 9: ...ted the voltage at the output will change and trigger either IC1C or IC1B The op amps IC1A IC1B and IC1C are configured as voltage comparators In the ready state the output of IC1A is high and IC1B and IC1C are low When IC1D outputs a voltage lower than 1 41V it will force pin 2 of IC1 high When IC1D outputs a voltage higher than 1 67V it forces pin 8 and pin 2 of IC1 to go high A high in with one...

Страница 10: ... D R5 39kΩ 5 1 4W Resistor orange white orange gold R3 75kΩ 5 1 4W Resistor violet green orange gold C8 500pF 501 Discap D1 1N4148 Diode see Figure A R4 1 6MΩ 5 1 4W Resistor brown blue green gold See Note R6 620kΩ 5 1 4W Resistor blue red yellow gold See Note R9 47kΩ 5 1 4W Resistor yellow violet orange gold 14 pin IC Socket IC1 LM324 Integrated Circuit see Figure C R12 300kΩ 5 1 4W Resistor oran...

Страница 11: ...70kΩ 5 1 4W Resistor yellow violet yellow gold SW1 Slide Switch R16 300Ω 5 1 4W Resistor orange black brown gold 8 pin IC Socket IC2 HT2812G Integrated Circuit see Figure C Q1 MPSA18 Transistor see Figure B R15 5 6kΩ 5 1 4W Resistor green blue red gold Speaker Wires Solder the two wires to the PC board marked SPK Note If wires need resoldering 1 First apply a small amount of solder to the outside ...

Страница 12: ...switch key onto the switch as shown in Figure 17 Make sure that the key switch is sitting properly on the switch Step 3 Place the PC board into the front case as shown in Figure 18 Attach the back case to the front case with two 4 x 5 8 screws Note There is a small groove that the key switch fits into Figure 16 4 x 1 4 Screws 4 Washers Figure 17 Switch Key Figure 18 ...

Страница 13: ... position it disconnects the voltage to the sound generator IC only The rest of the circuit is still operating The battery will run down if it is left in the OFF position To increase battery life remove the battery if you intend to leave the unit in the OFF position for long periods of time INSTALLATION The detector can be either placed on a flat surface or mounted onto a wall Adjust the angle lev...

Страница 14: ... 25V C 700V A Voltage at point A incorrect 1 Check R1 2 Check for a short between point A and GND B Voltage at point B incorrect 1 Check R1 C1 for correct value 2 Check for a short between point B and GND C Voltage at point C incorrect 1 Check R2 C2 for correct value 2 Check for a short between point B and GND C B A OPERATIONAL AMPLIFIERS 3 Measure the voltages at IC1 while the unit is at standby ...

Страница 15: ...he voltage at the following pins on U2 as listed in the chart below A No voltage at pin 3 1 Check R13 R14 SW1 and C5 B No 5V at pin 5 1 Check SW1 solder connection 2 No 5V at pin 6 3 Check C9 C Outputs two short tones 1 Check C5 Pin Voltage 1 0 3 8V 7 0 3 8V 8 0 3 8V 14 1 5 3 8V U2 Voltage Voltage Pin No Sound Sound 3 0 0 4V 5 5V 5V 6 5V 7 0V 735V Q1 Voltage Voltage Pin No Sound Sound E 0 0V B 0V ...

Страница 16: ...nt energy is transformed into heat C mechanical energy is transformed into heat D solar energy is transformed into heat 6 What are the two inputs called in an op amp A non inverting and inverting B V1 and V2 C VEE and VCC D gates 7 A high pass filter attenuates all signals A between two frequencies B below the critical frequency C above the critical frequency D with high amplitudes 8 The formula f...

Страница 17: ... 16 SCHEMATIC DIAGRAM ...

Страница 18: ...eedback Comparator An electronic device to detect voltage differences Critical Frequency The frequency at which power in a filter falls to half Crystals An inorganic body with plane surfaces in a geometrical form Current The flow of electrons Detector A device that changes signals into useful information Electromagnetic A radiated wave having both electric and magnetic properties FET Field Effect ...

Страница 19: ...tors Reference Voltage Level of electronic element used for providing resistance in a circuit Resistor An electric element used for providing resistance in a circuit Response Curve The shape of an output produced by a circuit Solder An alloy mixture of tin and lead used in the melted state to join or repair metal parts Transistor A three terminal semiconductor device used for amplification switchi...

Страница 20: ...Elenco Electronics Inc 150 Carpenter Avenue Wheeling IL 60090 847 541 3800 Web site www elenco com e mail elenco elenco com ...

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