Posted inMeters & Detectors
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. [...]
Posted inMeters & Detectors
Simple metal detector Project
This is a simple metal detector circuit, Can find various metal and adjustable sensitivity Easy to use near metal. use IC-NE556-Monostable multivibrator
Posted inMeters & Detectors
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. [...]
Posted inMeters & Detectors
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
Posted inMeters & Detectors
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…