You are meeting tiny visual zero beat indicator circuit. It is suitable for showing to an audio signal or CW tuning indicator. Which is lower than 3Vp-p. In the circuit…
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This is a simple metal detector circuit, Can find various metal and adjustable sensitivity Easy to use near metal. use IC-NE556-Monostable multivibrator
This circuit is built to add capacitance meter range range for a general digital multimeter which is small,cheap and most popular. [...]
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
This is an Simple blown fuse alarm circuit for AC line, cause we know immediately when broken fuse circuit and it has a few components so easy build cheap.
This is Automatic day indicator circuit, by LED display each day one by one LED.Use light-activated in day to set LDR-sensor and CD4017 acts as drive LEDs
Universal tester circuit by VCO or voltage controlled oscillator circuit that use voltage signal level from input to control amount of frequencies output