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Timer project

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

not SMD.

Thanks in advance.

Habilidades: Eletrônica, Mecatrônica, Microcontrolador, Layout PCB

Ver mais: timer cmos project, timer project, small microcontroller, voltage , timer, project cost, piezo, microcontroller design, microcontroller circuit design, lithium, foot, cmos design, battery, using microcontroller project design, voltage design, trigger change, switch project, microcontroller project switch, microcontroller small project, small project microcontroller, normally closed circuit using, open smd, electronics circuit, low battery change switch, open switch

Acerca do Empregador:
( 9 comentários ) Oxford, United Kingdom

ID do Projeto: #563395

Premiar a:


Pls chack your PMB

$150 USD em 4 dias
(4 Avaliações)

22 freelancers estão ofertando em média $117 para este trabalho


Details sent as a PM.

$250 USD in 3 dias
(2 Comentários)

Hi, I can do it for you, but why you afraid from SMD ? The 0805 is similar to solder like the non SMD components. Zoltan

$50 USD em 1 dia
(2 Comentários)

I think i will give very low power 74HC series Components,the circuit will not consume current until the button is press,so it will consume dynamic current for 20 Sec of buzzer operation.Rest will fraction of micro amp Mais

$100 USD in 4 dias
(4 Comentários)

hi I am an electronic engineer capable of doing it.Looking for a response.Thanks

$100 USD in 7 dias
(4 Comentários)

Please see your PMB.

$100 USD in 2 dias
(1 Comentário)

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.

$30 USD in 0 dias
(1 Comentário)

Hello, my name is Mariano, I am from Buenos Aires, Argentina, and I am currently studying Electronics Engineering at my local University. I am really interested on your project. Please check PM for details. Thank you i Mais

$80 USD in 6 dias
(1 Comentário)

I teach Electronic/Electrical Engineering at a College. I have the capability of not only building the schematic for your circuit but simulating your circuit in real-time to make sure that it works before I send you t Mais

$250 USD in 30 dias
(0 Comentários)

Respected Sir/ Madam, I have done similar timer projects before I have understood the technicalities of the project . I am sure I can do the project with a prefection. I require yo Mais

$100 USD in 20 dias
(0 Comentários)

Helo sir,. I am a graduating student of a World class institution taking up the course of Electronics Engineering Technology Major in computer. I had read your post about Timer project and I'm still studying the said p Mais

$150 USD in 20 dias
(0 Comentários)

Hi, i can do this project within mean time with low budjet

$150 USD in 15 dias
(0 Comentários)

I can design the circuit for you by 5 days. I would like to use 8051 Microcontroller and the program will be written in Assembly.

$55 USD in 5 dias
(0 Comentários)

hi i am doing electronics engineering sir and i thing i have a better knowledge about electronics for making this project.i have already made a timer during my study using 555 timer.i think this timer fullfil your req Mais

$200 USD in 10 dias
(0 Comentários)

hi I am an electronic engineer capable of doing it.Waiting for a response.Thanks

$110 USD em 1 dia
(0 Comentários)

I am an electronics engineer and have done projects regarding 555 timers can give u a schematic regards Farhan

$175 USD in 7 dias
(0 Comentários)

Hi, please check your pm, thanks.

$30 USD em 1 dia
(0 Comentários)

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

$110 USD in 3 dias
(0 Comentários)

Hello, reffer to your PMB.

$30 USD em 1 dia
(0 Comentários)

It's as easy as it gets! It can be done in several ways - by using 555 timer, or by using some CMOS logic, or, if precise timing is needed - by using microcontroller like PIC or AVR or something. In case of using AVR y Mais

$200 USD em 1 dia
(0 Comentários)

Fully capable design with using a LM555 capable. I have 5+ years of electronics experience and practical application design. I use industry standard schematic editors and design software including PSpice and Eagle CA Mais

$50 USD in 7 dias
(0 Comentários)