Hi ! I am studying EEE, we like to do a mini project !!! so we planned to combine Automatic school bell,clock timer circuit,mini ups,multitone siren cicuits together...
Is it possible to do ??? please help me..
if it possible means can u explain what are modifications can be done in the circuit ???
hi,these are attachments for our projects... Please tell,what are the changes can we make..
hi,
A couple of OP's have already made this version of a school timer.
By changing the transistor/resistor network, on the left side of the circuit, different time periods.
Its a variant of your 3rd one of the images you posted.
ya thank you ! but can you say me how did you calculate that resistor values in this school bell ? because we need 30 mins for lunch hour..
In this circuit,instead of 230 volts AC bell, can we use any siren circuit of 6-12 v without connecting to the relay ?? reply me please..
Ya this project is about automatic college bell,in which we plan to make some changes like. instead of using AC bell we like to attach multi tone siren,also clock timer is added for switching on the circuit automatically at last we planned to give the supply for all these circuits through mini UPS circuit... so this the brief explanation of about our project..I wondered what project is this 'sridevi'.
ya sure !! this is the siren circuit !!You could drive a 12V siren, choose a suitable transistor for the siren current requirement.
Do you have any details for the siren that you could post.?
ya sure !! this is the siren circuit !!
If that whole circuit is the siren I would recommend that you use the original circuit relay to switch the siren on.
Ya this project is about automatic college bell,in which we plan to make some changes like. instead of using AC bell we like to attach multi tone siren,also clock timer is added for switching on the circuit automatically at last we planned to give the supply for all these circuits through mini UPS circuit... so this the brief explanation of about our project..
can you explain me, why it is better to use siren with relay for this bell circuit ???
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