I need the (schematic only) for a timer circuit. The timer will operate a very small piezo transducer.
The circuit will be powered by a CR927 3v lithium cell battery.
The trigger is a normally open switch, when the switch is closed, the piezo transducer sounds for
15 seconds 20 seconds AFTER the switch is closed. (20 second delay)
The unit then resets. if the switch is opened or closed during the 20 second delay, it should have no effect on the timing.
I'm using Livewire (Circuit design) to change the design later on. It would be ideal if the circuit used a cmos LMC555 (or low voltage 556 or passive components only) and had a way for me to alter the passive components to adjust the timing.
What is a constant is the 3v battery and very small piezo transducer.
I need the circuit to fit a very small foot print using low cost components and solderable components
Thanks in advance.
22 freelancers estão ofertando em média $117 para este trabalho
I can give this one at best price and in next 2-3 hour. If required I can provide you very mini PCB design also (in eagle free version) so that the size be very small.
Please provide some additional details. I have worked on LMC 555 before, so I think I can help you. Pricing and time is indicative, it will depend on your project. Thanks Pulkit