The circuit has been designed for telephone apparatus to indicate an incoming call as it rings using an LED for visual indication. BC550 – an NPN general purpose transistor with low current and low ...
The circuit was designed to produce a timing scheme that will provide a longer span of time to become activated. LM555 – a highly stable device for generating accurate oscillation or time delays with ...
Although many special-purpose push-pull power drivers are available, they can be expensive and single-sourced. An LM555 timer can be configured as a gate and line driver in a buffer or inverter ...
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