Tiny emergency light circuit
This is first tiny emergency light of my son. It is very small, use LED display when power outage,use transistor instead relay use AA battery charger. How it works As Figure 1; Tiny emergency Light circuit use a few parts include the two AA nickel-metal hydride batteries, for store enough …
Digital volume control circuit schematic
This is digital volume control circuit that Can be applied to the normal volume of a power amplifier. When press switch S1 adds up the volume and press switch S2 to reduce the volume down. How it works IC1 is a 555 CMOS Timer Single IC will be connected in …
High Temperature fire Alarm Circuit using transistors
This is high temperature fire alarm circuit, when the temperature rise exceeds the limit, it will sound the siren rang out. It is easy to use with transistor circuit to detects heat. Then, a loud noise of the sirens with IC packages. How it works We uses the combination between …