Metering and Instrument Circuits
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LC Meter Circuit using 555 Timer
The value of a reactive element such as a capacitor or inductor is measured using an LC Metre circuit. The…
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Plant humidity monitor
This little circuit monitor the humidity of plant soil and should be a welcome help for forgetful readers who occasionally…
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Continuity Tester
A continuity tester is very useful for checking printed-circuit boards. It indicates a sound connection by a squeak from a…
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Precision Rectifier for Digital Voltmeter(DVM)
The voltmeter is an electrical measuring instrument used to measure the potential difference between two points. The voltage to be…
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Measuring Electrolytic Capacitors
Most capacitance meters have no facility for measuring large electrolytic capacitors. The circuit described here makes it possible for such…
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Audible Level Indicator
Detect and measure the level of a liquid within a tank with level indicators. Standard technologies used to measure levels…
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LED VU Meter
VU is an abbreviation for volume unit. Thus, a VU meter is a device for measuring the level of SOUND…
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Optical squelch
Many of the less expensive short. Wave receivers have no squelch circuit and continue to emanate noise when no usable…
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PC fan control Circuit
It is an unfortunate and well-known fact that most PCs of IBM and compatible type make a lot of noise.…
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Solid State Voice Recorder
A solid-state recorder (SSR) is a recording device that uses solid-state technology to store recorded audio data. SSRs record and…
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