IC 555 Projects

(BP44)
CONTENTS
1. THE 555 TIMER
2. BASIC CIRCUITS
Monostable
Multivibrator (Astable Operation)
Edge Triggering and Monostable Chains
Reset Facility
Driving High Current Loads
Re-triggerable Circuit
High Stability Multivibrator
Very Long Time Delays
Control Voltage Pin 5
Pulse Width and Pulse Position Modulation
Constant Current Charging
Multivibrator Duty Cycle
Inductive Loads
Mark/Space Adjustment
Initiation by Supply (Intentional and Unintentional)
3. MOTOR CAR CIRCUITS
Introduction
Lights on Warning
Indicator Warning
Emergency Flashers
Wiper Delay
Washer Control on Wipers
Rev Counter
Car “Courtesy” Courtesy Light
Car Burglar Alarms
4. MODEL RAILWAY CIRCUITS
Introduction
Model Railway Shuttle Service
Station Stop/Start
Model Railway Controller
5. GENERAL CIRCUITS
S.C.R. Drive (Photographic Timer)
Heater Control
Motor Underspeed Alarm
Overspeed Warning
Coin Tosser
Assorted Random Number Generators
Electronic Dice
Touch Switch
Capacitance Meter
Computer Voice
Continuity Tester
Signal Generator
Frequency Divider Circuit
6. ALARMS AND NOISE MAKERS
Introduction
Simple Alarm Circuit
Bleeper Circuit
Police Siren
Siren
“Star-Trek” Red Alert
A Childs Mini Electric Organ
Metronome
7. 555 VARIATIONS
556 Timer
555 and 559 Quad Timers
558 and 559 Timer Circuits
PRACTICAL NOTES
9. ADDITIONAL NOTES
Simple Siren and Warble
Destroyer Siren
Driving Low Impedance Speakers
10. THE 555 AND LOGIC
11. FAULT FINDING
12. FURTHER 555 VARIATIONS
13. FURTHER GENERAL CIRCUITS
Microprocessor Related Circuits
Single to Dual Rail Supply
Tacho and Speed Switch
Ultrasonic Transmitter
Pulse Stretcher Probe
TV Test Pattern Generator
Improved Pulse Width Modulator