Posted inMeters & Detectors
KA2284 Stereo audio level indicator
Here is cheap Stereo audio vu meter circuit with PCB. using KA2284 x2 and 10 LED or 5 LEDs per channel, it is simple to builds and few parts. put projects
Posted inMeters & Detectors
Simple Moisture Meter using 2N2222
This simple moisture meter circuit uses for level moistness temple of the earth. Fine the value R2 give Meter read the value has 1mA. When the moistness [...]
Posted inMeters & Detectors
Simple solar plant watering alarm
This is simple Solar plant watering alarm circuit. It will sound alarms when the soil is dry. The trees have died. It the solar sell is 6V DC power supply
Posted inMeters & Detectors
VHF Dip Meter circuit
The frequency meter by use the LC resonance circuit that adjustable until the frequency show peak amplitude.
Posted inMeters & Detectors
8 Low Battery Voltage Alarm indicator circuits
Why your circuit does not work? Because the battery is run out. These low voltage indicator circuits may helpful for you. If you can know before and change a new one right now. It makes you not have to waste time when using those projects.