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Elenco Electronics ST-751, Руководство по сборке

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Parts List

If you are a student, and any parts are missing or damaged, please see instructor or
bookstore. If you purchased this signal tracer kit from a distributor, catalog, etc., please
contact Elenco

®

Electronics (address/phone/e-mail is at the back of this manual) for

additional assistance, if needed.

Resistors

Qty.

Symbol

Description

Part #

1

R6

100

W

5% 1/4W (brown-black-brown-gold)

131000

1

R16

220

W

5% 1/4W (red-red-brown-gold)

132200

1

R10

1k

W

5% 1/4W (brown-black-red-gold)

141000

1

R13

2.7k

W

5% 1/4W (red-violet-red-gold)

142700

1

R14

3.9k

W

5% 1/4W (orange-white-red-gold)

143900

1

R8

4.7k

W

5% 1/4W (yellow-violet-red-gold)

144700

1

R5

6.8k

W

5% 1/4W (blue-gray-red-gold)

146800

3

R3, R9, R15

10k

W

5% 1/4W (brown-black-orange-gold)

151000

1

R12

47k

W

5% 1/4W (yellow-violet-orange-gold)

154700

2

R1, R2

100k

W

5% 1/4W (brown-black-yellow-gold)

161000

1

R4

180k

W

5% 1/4W (brown-gray-yellow-gold)

161800

1

R7

220k

W

5% 1/4W (red-red-yellow-gold)

162200

1

R11

Trim Pot 220k

W

191622

Capacitors

Qty.

Symbol

Description

Part #

1

C1

.001

m

F Discap (102)

231035

3

C2, C3, C7

.1

m

F Discap (104)

251010

4

C4,C5,C6,C9

10

m

F Electrolytic (Lytic)

271045

Semiconductors

Qty.

Symbol

Description

Part #

1

D1

Diode 1N5234

315234

1

Q2

Transistor 2N3904

323904

1

Q1

Transistor MPS 5172

325172

1

U1

IC LM-358

330358

1

D2

LED Diode .125”

350001

Miscellaneous

Qty.

Description

Part #

1

PC Board

512751

1

Switch Slide DPDT

541023

1

Probe Tip

616001

1

Knob (white)

622019

1

Earphone Jack

622102

1

Case

623007

1

Earphone 8

W

629350

2

Screw #4 x 5/8”

643450

1

IC Socket 8-pin

664008

1

Alligator Clip Black

680001

1

Alligator Clip Red

680002

1

Alligator Clip Green

680003

1

Label

720510

12”

Wire

815820

36”

Cable 3-wire

870801

2”

Tubing #20 PVC

890020

48”

Solder

9ST4

-1-

Содержание ST-751

Страница 1: ...nc Copyright 2005 1996 by Elenco Electronics Inc All rights reserved 753031 Revised 2005 REV E No part of this book shall be reproduced by any means electronic photocopying or otherwise without written permission from the publisher Assembly Instructions ...

Страница 2: ...llow violet orange gold 154700 2 R1 R2 100kW 5 1 4W brown black yellow gold 161000 1 R4 180kW 5 1 4W brown gray yellow gold 161800 1 R7 220kW 5 1 4W red red yellow gold 162200 1 R11 Trim Pot 220kW 191622 Capacitors Qty Symbol Description Part 1 C1 001mF Discap 102 231035 3 C2 C3 C7 1mF Discap 104 251010 4 C4 C5 C6 C9 10mF Electrolytic Lytic 271045 Semiconductors Qty Symbol Description Part 1 D1 Di...

Страница 3: ... the flipplet point type and at all times kept clean and well tinned Many areas on the main board are close together and care must be given not to form solder shorts Size and care of the tip will eliminate problems For a good soldering job the areas being soldered must be heated sufficiently so that the solder flows freely Apply the solder simultaneously to the component lead and the component pad...

Страница 4: ...R10 1kW 5 1 4W brown black red gold R12 47kW 5 1 4W yellow violet orange gold R13 2 7kW 5 1 4W red violet red gold R14 3 9kW 5 1 4W orange white red gold R15 10kW 5 1 4W brown black orange gold R16 220W 5 1 4W red red brown gold R11 Trim Pot 220kW Figure 1 Top Legend Install and solder D1 the 1N5234 diode Note the diode has polarity as indicated by the band Mount the diode with the band correspond...

Страница 5: ...e polarity Place the negative lead in the correct hole as marked on the PC board and part Mount the electrolytics so that they lay on their side Figure 4 Install and solder the transistors with the flat side in the direction shown in Figure 1 Q1 MPS5172 Q2 2N3904 Flat Flat Tubes Install the probe tip Cut a wire to 4 3 4 strip 1 4 of insulation off of both ends Solder one end to point P on the PC b...

Страница 6: ... alligator boots onto the 4 wires on the end of the power cord red boot on the red wire green boot on the green or white wire and the black boot on the black wire Then solder the 3 clips to the wires Slide the boots onto the clips On the other end of the cable solder the black wire to the hole on the PC board marked GND Solder the green or white wire to the hole marked C Solder the red wire to the...

Страница 7: ...ssembly into the case as shown in Figure 6 Use two 4 screws to hold the case together DO NOT OVER TIGHTEN or the holes may strip out Tighten the nut down on the earphone jack Press the knob onto the gain control shaft Label Case Top PC Board Probe Notch Screw Screw Cable Notch Jack Notch Jack Nut This completes the assembly Your unit is now ready for testing ...

Страница 8: ... input of the last stage of the amplifier The tone should be heard in the earphone or speaker of the radio Continue injection by moving the tip toward the input and output of each stage Vary the probe gain to prevent overload of the probe If you have an AM radio try injecting the signal into the IF and RF stages The signal tracer produces a 1kHz harmonics which extend into the frequencies of the A...

Страница 9: ...tages and for testing of IF circuits in most FM radios The second section of the op amp is designed to be a variable amplifier The input impedance of this amplifier is 100 000W The gain of the amplifier is adjustable between 1 to 50 times depending on the setting of trim pot R11 Resistors R7 and R8 bias the input circuit with C4 serving as a bypass capacitor and C3 the input capacitor The output o...

Страница 10: ...with green clip connected to probe tip and the LED is on A Check to see if the IC is in backwards B Must determine if the oscillator or amplifier is at fault If an oscilloscope is available look at the output of the op amp pin 1 There should be 3 to 5V of a 1kHz squarewave If no scope is available put the switch to tip receive position and remove the green alligator clip from the tip Touch the tip...

Страница 11: ...ly write or e mail elenco elenco com us and explain 1 the tests that you have made and 2 how the instrument behaved during these tests Our experience has demonstrated that most difficulties can be corrected by an exchange of letters or a phone call If the instrument continues to work improperly and you would like Elenco to locate the problem send the unit along with a 10 00 check to our Service De...

Страница 12: ...Elenco Electronics Inc 150 Carpenter Avenue Wheeling IL 60090 847 541 3800 Website www elenco com e mail elenco elenco com Schematic Diagram ...

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