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Scrapping of Old Circuit for New One

A project log for 555 Sanitizer Dispenser (With cut-Off)

Simple analog Sanitiser Dispenser (No-Contact) using 555 timer IC with auto cut-off timer (even with trigger). Cheap and No-Coding Solution.

vybhav-nagvybhav-nag 10/13/2020 at 04:350 Comments

The old circuit v1 is based on 555 IC, for which needs more discrete components and can't connect the IR diode / photo diode directly without an amplifier.

So, if an amplifier is used cheapest one available is an LM325, which is a dual OpAmp package, so instead of using a 555 to create a single pulse / one shot / monostable circuit. The same can be achieved using an OpAmp.

OPAMP 1 : Sensor / Signal amplifier.

OPAMP 2 : Monostable / One Shot circuit.

So, whoever wanting to create a project using these circuits, please wait for V2 of circuit, which will b cheaper and more reliable.

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