This is IC 4060 Timer circuit. When rises time that is set, Suppose set 5 minutes time. after all time to 5 minutes. the circuit will emit a sound of buzzer once.
This is timer circuit uses a 555 IC timer. it small,compact,portable. For the snooze alarm by buzzer when some 5 to 30 minutes. It make easy with pcb layout
This is small integrated amplifier at 20W using a TDA2004 or TDA2005 IC,use 12V supply for BCL car audio amps
This is many LED flasher circuit and with PCB layout using transistors astable multi vibrator as low frequency oscillator below more...
This is Simple automatic battery charger circuit, using the small SCR and relay is cheap and can use all battery size by input source.