Elektor-303 Circuits.pdf

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303
CIRCUITS
I
Elektor Electronics
CIRCUITS
A WOLTERS-KLUWER COMPANY
Elektor Electronics
Harlequin Avenue Great West Road
BRENTFORD Middlesex TW8 9EW ENGLAND
Telephone: 01-847 2618 Telex: 917490
1
All rights reserved. No part of this book may be reproduced or transmitted in any
form, or by any means, including photocopying and recording, without the prior
written permission of the publishers. Such written permission must also be ob-
tained before any part of this book is stored in a retrieval system of any nature.
The circuits and other diagrams contained in this book are for domestic use only.
Patent protection may exist with respect to circuits, devices, components, etc.
described in this book. The publishers do not accept responsibility for failing to
identify such patent or other protection.
This book is sold subject to the Standard Conditions of Sale of Net Books and
may not be re -sold in the United Kingdom below the net price given by the
publishers in their current price list.
First printed 1988
Copyright © 1988 Elektuur BV
Printed in the Netherlands
ISBN 0 905705 26 2
WARNING!
ELECTRICITY CAN BE DANGEROUS!
The electronic projects in this book are, to
the best of the author's knowledge and
belief, both accurately described and safe.
None the less, great care must always be
taken when assembling electronic circuits
which carry mains voltage, and neither the
publishers nor the author can accept
responsibility for any accidents which may
occur.
Because electricity is dangerous, its use,
application and transmission are subject to
rules, regulations and guidance. These are
laid down in numerous laws, Electricity
Generating Board regulations, British Stan-
dards, and IEE recommendations. Some of
these may be obtained from your local
electricity showroom, but most, if not all,
should be available for reference in your
local library.
contents
CIRCUITS FOR:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Audio & hi-fi
Cars & bicycles
Computers & microprocessors
Design ideas
Electrophonics
HF & VHF
Hobbies & pastimes
Home & garden
Power supplies
10. Test & measurement
BRAKE LIGHTS MONITOR
CAR BURGLAR ALARM
CAR FUSE MONITOR
CAR LIGHTS MONITOR
CAR RADIO ALARM I
CAR RADIO ALARM II
COURTESEY LIGHT DELAY
FLASHING REAR LIGHT
GARAGE STOP LIGHT
HALOGEN LAMP PROTECTOR
LED REVOLUTION COUNTER
MOTOR -CYCLE GEAR INDICATOR
55
56
57
57
58
60
60
61
62
63
63
67
11. TV & video
1. AUDIO AND HI-FI
AUDIO -CONTROLLED MAINS SWITCH
AUDIO LINE DRIVER
AUDIO TRANSFER EQUALIZER
COMPRESSOR
CURRENT CORRECTED AF AMPLIFIER
DIGITAL AUDIO SELECTOR
DIGITAL VOLUME CONTROL I
DIGITAL VOLUME CONTROL II
DISCOMIXER
HEADPHONE AMPLIFIER
HI -Fl HEADPHONE AMPLIFIER
9
10
10
11
13
14
15
17
18
HIGH DYNAMIC RANGE MIXER
INTEGRATED STEREO AMPLIFIER
LOUDSPEAKER PROTECTION I
LOUDSPEAKER PROTECTION II
LOUDSPEAKER PROTECTION III
LOW -NOISE RIAA PREAMPLIFIER
MICROPHONE PRE -AMPLIFIER WITH
MUTE SWTICH
MICROPHONE -SIGNAL PROCESSOR ...
MINI -AMPLIFIER
MINI STEREO AMPLIFIER
MOSFET POWER AMPLIFIER
NOISE GATE
SIMPLE PRE -AMPLIFIER
SINGLE -CHIP 40 W AMPLIFIER
22
25
26
27
27
29
30
32
36
39
3. COMPUTERS AND MICROPROCESSORS
4 -WAY DAC EXTENSION
68
8 -BIT ADC
69
70
8 -BIT DAC
71
16 -KEY INPUT FOR MSX MICROS
32 KBYTE PSEUDO ROM
72
40 -TRACK ADAPTOR
75
2708 ALTERNATIVES
75
6502 TRACER
76
A -D CONVERTER FOR JOYSTICKS
78
BI-DIRECTIONAL PARALLEL INTERFACE FOR
C64
79
BI-DIRECTIONAL SERIAL -PARALLEL CON -
VERTER
80
BUS DIRECTION ADD-ON FOR MSX EXTEN-
SIONS
82
COMMUNICATION PROGRAM FOR C64
83
CPU GEAR/BOX
86
CURRENT LOOP FOR MODEM
87
DIRECT READING DIGITIZER
88
DISCRETE DAC
90
DRIVE SELECTOR
FILTERED CONNECTOR
FLOPPY CENTRING UNIT
FLOPPY DISC DRIVE
91
40
40
41
42
SMD HEADPHONE AMPLIFIER
SPEECH PROCESSOR WITH
BACKGROUND SUPPRESSION
STEREO INDICATOR
STEREO PRE -AMPLIFIER WITH
TONE CONTROL
SUBWOOFER FILTER
TRUE CLASS/B AMPLIFIER
TUNING AF POWER STAGES
43
44
45
46
48
48
50
51
52
2. CARS AND BICYCLES
AUTOMATIC CAR ALARM
BICYCLE LIGHTS AND ALARM
54
54
HEXADECIMAL KEYBOARD
IMPROVED SOUND FOR THE BBC
MICRO
JOYSTICK ADAPTOR
LEVEL ADAPTOR FOR ANALOGUE
JOYSTICKS
LISTEN -IN KEY FOR DATA RECORDERS .
MAINS INTERFACE
MANDELBROT GRAPHICS
MORSE TRAINING WITH THE JUNIOR
COMPUTER
PIA FOR ELECTRON
QL RAM EXTENSION
RAM EXTENSION FOR QL
RS232 INTERFACE
SAMPLE & HOLD FOR ANALOGUE
SIGNALS
92
92
93
94
95
96
97
98
98
99
100
102
103
104
105
107
5

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