555 circuits
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Cupboard Lights
Feb 11th
This Cupboard lights circuit is an automatic White LED lamp used to illuminate the interior of cupboard to search things. The lamp automatically turns on when the door of the cupboard opens and stays on for three minutes then turns off (more…)
555 Triangle Waveform Generator
Feb 6th
The circuit is a triangle waveform generator that uses as few parts as possible. A 555 timer IC, 2 resistors and two capacitors make the triangle wave. The IC is connected in a 50% duty-cycle astable square-wave oscillator circuit. The square-wave output is fed from pin 3 of the IC to an RC shaping circuit. (more…)
1 Hz Pulse Generator
Jan 24th
Here is a 1Hz pulse generator using the popular timer IC 555 which is wired as an Astable Multivibrator. The output pulses can be indicated visually by the LED. An Astable Multivibrator, often called a free-running Multivibrator, is a rectangular-wave generating circuit. Unlike the Monostable Multivibrator, this circuit does not require any external trigger to change the state of the output, hence the name free-running. This circuit can be used in applications that require clock pulses (more…)
Reflex Tester Circuit
Jan 22nd
Testing human reaction speed is not only a fun way of spending time, but also allows the drawing of conclusions, for example on the skills of a momentary driver. When the contact closes the power button, the astabil multivibrator built with IC1 produces pulses that are applied to counter IC3. D1 …. D10 LEDs light up sequentially in a chained fast. (more…)
Fatigue Testing
Jan 12th
This fatigue testing circuit is very simple and easy to build and will determine how tired a person is. It has been discovered that the highest light frequency that a human can detect is negatively influenced by his fatigue. This circuit is based on 555 timer that is connected here as an astable multivibrator. Its output is connected to a LED that is flashing with a certain frequency. (more…)
Transients Indicator
Jan 9th
Instant voltage transients are common in the power lines especially in places where machinery is operating. Inductive loads and high power transformers creates transients and spikes in the mains lines. Such voltage fluctuations are dangerous to SMPS based power supply and Microcontrollers. Here is a simple circuit that constantly monitors the power lines and beeps with each voltage fluctuation.
D.Mohankumar (more…)
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