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NE555

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• Water Activated Alarm
  Tom XxTomxx14[ a ]aol.com The circuit uses a 555 timer wired as an astable oscillator and powered by the emitter current of the BC109C. Under dry conditions, the transistor will have no bias current and be fully off. As the probes get wet, a small current flows between base and emitter and the transistor switches on. A larger current flows in the collector circuit enabling the 555 osillator to sound. An On/Off switch is provided and remember to use a non-reactive metal for the probe contacts. ...
• Model Rocket Launch Controller
  Most commercial rocket controllers available to buy are either expensive or do not have many features. After a lot of searching I found nothing that met my needs. I wanted a controller that could work multiple pads, as well as being easy to set up and pack away, so I designed my own. It has the ability to control up to 8 pads through a 6 core cable. You may want to be able to disconnect all your units. I used 6 pin DIN plugs so that all the units can be disconnected and easily transported. I ...
• 555-based class-D headphone driver makes great practice amp
  Petre Petrov EDN The popular 555 timer ( LMC555 , SE555 , NE555 , HA555 ) can be used as a PWM/Class-D amplifier for musical instruments or other applications. It can use a wide supply range of 4.5-16 V and produce 200 mA of drive. The audio is fed to the 555’s CV (control-voltage) pin. This Design Idea presents two simple, cheap drivers for headphones and audio lines. The drivers were designed for electric guitars and violins, but have many more applications. For such simple ...