| Whether you are designing, repairing, or testing audio and hi-fi gear, a reliable frequency counter is a must-have tool. This classic freque...
More in Circuits & Circuit Design (34)
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| Here comes a small but intelligent circuit that virtually prevents us from making power supply errors, using a different cable for each sing...
| A defective parking sensor can be expensive if you don’t notice it in time and get it repaired. Following the engineer’s ironclad rule “Do i...
| Build a compact lithium battery health monitor that shows State of Charge (SoC) and State of Health (SoH) using colorful LED bars. Based on...
| Tired of hunting short-circuits with a magnifying glass? This clever circuit makes locating a PCB short fast and frustration-free. Build a s...
| Never miss a blown fuse again! This ultra-simple four-component circuit ensures you’re instantly alerted when a mains fuse fails, using an a...
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| Current signals of 4-20 mA are commonly used in industrial applications to transmit process signals to controllers. Compared to analog volta...
| Discover the Mostronome, a 1975 electronic metronome that reimagined musical timing with its whistle-like tone. This vintage circuit proves...
| Do you want to power a group of lighting LEDs? Here we present a handy solution to provide extremely accurate and stable current source for...
| Monitor up to six temperature points from -240°C to +850°C with this 8051-based temperature monitor and logger. Ideal for industrial applica...