Free Simple Circuit Diagram
A one shot multivibrator generate a fixed width pulse at the output when the input is triggered. This fixed width output should be consistent, regardless the width of the input trigger. One example of one shot multivibrator circuit is shown in the following schematic diagram, which uses LM139 as the main active component: The width of the output is determined […]
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555 IC is very popular component for timer circuit. With integrator circuit, we can extend the timing period of 555IC timer with reasonable capacitor size. With conventional 555IC timer configuration, the timing capacitor will be large compared to integrator version. You can see the comparison in the graph below the schematic diagram. [Circuit’s schematic diagram source: seekic.com]
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This is a pulse stretcher circuit using optocoupler. This circuit uses a 4N26 opto-coupler combined with a standard one-shot circuitry. This circuit is triggered by pulse about 3μs (minimum width) at 15mA. The output’s amplitude of this circuit is not depend on the input’s amplitude. The output pulse amplitude is a function of (or proportional to) supply voltage on the […]
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This timer circuit use a single op-amp which is configured as comparator, very simple, and cheap. This alarm will sound a buzzer after a period of time has elapsed since the power supply is applied. Here is the schematic diagram of the circuit: At the initial condition after the circuit is powered (you better insert a switch fro easy operation), […]
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