Monthly Archives: June 2009

Sawtooth Wave Signal Generator Using 555 IC

Posted on June 17, 2009 by Adam
sawtooth-wave-oscillator-555

Generating sawtooth wave signal can be implemented using several ways, and one of the very popular method is by using constant current source to charge a capacitor. If you’ve seen many method that use an SCR or its bipolar transistor … Continue reading →

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Fill/Empty Water Level Controller

Posted on June 17, 2009 by Adam
water-pump-controller

A controller for keeping the water level stays  between upper and lower limits is described here. This water level controller is actually a water pump controller that turn the pump on or off based on the detected water level. This … Continue reading →

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555 Oscillator With 50% Duty Cycle

Posted on June 17, 2009 by Adam
oscillator-555-50-duty-cycle

To generate 50% active factor (duty cycle) using 555 IC, we can use two diodes to separate the charging and the discharging path. With no diodes, we can also generate 50% duty cycle using 555 IC by configuring the circuit … Continue reading →

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