The telephone line status indicator
The telephone line status indicator to prevent the hearing others talk on the phone accidentally and a Protection to making phone calls simultaneously. […] Read more
Meters & Detectors
Simple metal detector circuit
This is a simple metal detector circuit, Can find various metal and adjustable sensitivity Easy to use near metal. use IC-NE556-Monostable multivibrator Read more
Adding Capacitance Meter Range for Digital Multimeter
This circuit is built to add capacitance meter range range for a general digital multimeter which is small,cheap and most popular. […] Read more
1.5V battery tester circuit using LM324
This fine 1.5V battery tester circuit using LM324, Can measure the voltage of the 1.5V battery AA or AAA. As decimal point. Easy to use by LEDs display Read more
Simple soil moisture alarm circuit diagram using 1.5V battery
Why withered trees. It is dying. Oh, the soil is too dry. How can we use electronics to help trees? Build Simple soil moisture alarm circuit. The tree is very necessary for humans. Because can clean waste air, as a food, housing, medicine, etc., We should tree planting as well. Water is necessary for the … Read more