Include: Volt meters :: Sound level meter :: Analog vu meter :: Soil moisture meter :: Digital meter circuit diagram :: Temperature measurements :: Electronic measurement tools :: Frequency meters :: Best battery tester :: Transistor tester project
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This Diode tester circuit can check the diode the good or bad and also can indicate its polarity. using op-amp 741IC and LED for display. [...]
This Simple remote control tester circuit so use this photo transistor is light receiver from remote control.If it is nice to have bias of transistor BC558
Simple light meter circuit idea using normal diode as sensor, amount of light by voltmeter. Using op-amp-CA3140 and a few parts.
High performance LM3914/LM3915 VU meter circuit projects that widely popular can display with 20 LEDs on stereo or mono with 10 LEDs for all audio system. [...]
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
