This shows the operation of a thumbwheel switch, which has BCD output. It is used to Preset Values in Digital Instruments. Before Microcontrollers and RAM this was the Input device. Even now in industrial instrument this is a simple input device.
Learn about switches here .. Types of Switches
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555 Timer Chip Reference
- LM555 - Timer
- 555 and 556 Timer Circuits
- doctronics.co.uk - 555 Timer
- 555 Timer Calculator
- 555 Timer - Frequency and Duty Cycle Calculator
- An LED Stroboscope
- Astable 555 Square Wave Calculato
- The 555 Monostable Circuit
- Monostable 555 Timeout Calculator
- NE555 Basic Monostable
- 555 IC is used to produce an ASTABLE circuit
- Educypedia - Electronics -Digital Tiimers
- 555 and 556 Timer IC software Schematica
- 555 Timer/Oscillator Tutorial
- 555 Timer Tutorials
- LM555 and LM556 Timer Circuits
delabs 555 Resources

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