Dear All,
I have designed alarm clock project with ds 1307.Here I want to ring 230v electric bell in particular alarm time set by keypad.then I designed relay circuit.here relay opens & close normally acording to alarm time.But when I connect electric bell then bell rings & stops but clock also stops.please reply.
You may connect it to any valid logic level, (VCC, GND, pullup, pulldown, or any other signal.where I have to connect unconnected inputs of eeprom & 74hc574?
Yes, between VCC and GND. An additional Tantalum with 10uF at 12V to GND helps additionally to stabilize 12V.I have to give vcc through tantalum capacitor?
Power supply schematic seems to be OK. A proper PCB layout with GND plane is essential, too.please reply.my power supply circuit that i have designed is here.
Yes. don´t leave it floating.can it couse problom of floating?
* oscillatingwhat happen if a0,a1,a2 & pins of 74hc574 are left open?
All the led current is flowing through the clock's vcc pins. I'd avoid this to ensure clean power supply. Here i'm talking about the chip's internal bonding wiring. I'm not sure if it is meant to drive 2x Led current.
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