For learn about MOSFET. I recommend Time Delay circuit easy to make and long time and a few parts than normal transistor
The OFF After Delay circuit on Breadboard using MOSFET
This is first mini emergency light of my son. It is very small, use LED display when power outage,use transistor instead relay use AA battery charger.
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 Simple touch switch using transistor is the touch switch is updated from the original,this circuit is thought to are suitable because uses TR purely.
This circuit prevents surges. From the opening is switched off or power failure. The damage to electrical appliances.
This is On-off SCR control circuit with logic gate IC. SCR will turn ON when input A gets bias current. But SCR will turn off if its input B gets current.
It will prevent the speaker from too over high power output may speaker damaged it use transistor and relay cut off as safe.