Tools and measuring schematics

Uncover the hidden integrity of your printed circuit boards with this simple schematic. Detect 0V, voltages from 3V to 30V, and floating components using LEDs and a FET constant-current generator. Build your diagnostic tool and gain confidence in your board’s functionality.... [read more]

Build a stunning electronic barometer replica inspired by Torricelli’s groundbreaking design. This circuit uses a Motorola MPX2200AP sensor and an LM3914 to display atmospheric pressure with 10 LEDs, offering a precise measurement range of 950 to 1040 hPa.... [read more]

Unleash the power of precise signal detection with this ingenious logic probe. Featuring dual LEDs, it flawlessly identifies high and low signals, including pulse trains, thanks to its clever nor gate design. Driven by 12V, this compact tool empowers you to confidently analyze and build electronic circuits.... [read more]

Build your own LED tester with this easy schematic using an opamp (TL081) to precisely control current flow from 0 to 30mA, ideal for testing all standard LEDs. Achieve accurate current adjustments and monitor voltage with a 5V power supply.... [read more]

Unlock the secrets of LEDs with this essential testing circuit. Discover how to confidently assess your components, ensuring optimal brightness and pinpointing defective LEDs, even in the dark. Build your LED tester and illuminate your projects with precision and reliability.... [read more]

Build a precise temperature measurement system with this innovative circuit, enabling accurate readings from 00.0°C to 99.9°C. Achieve up to 100 meters of transmission, transforming your projects into sophisticated temperature monitoring solutions.... [read more]

Protect your model railway and eliminate frustrating short-circuit searches with this innovative over-current protection circuit. Easily isolate problem sections and keep your trains moving, ensuring seamless operation and maximum enjoyment of your meticulously crafted layout. Implement this simple, effective solution for a safer, more reliable, and truly inspiring model railway.... [read more]

Build a captivating electronic counter that responds to mains voltage! This project uses a 4017 IC to divide 50Hz, creating a mesmerizing LED flash of 5 times per second when near a live electrical source. Explore capacitive coupling and build this innovative circuit with a simple 4017, LED, capacitor, and battery. Unlock the secrets of electrical sensing and create a dynamic, responsive project.... [read more]

Detect broken wires quickly and confidently with this innovative circuit! This easy-to-build device uses just a few components—including a CMOS CD4069—to pinpoint broken wires in 1-, 2-, and 3-core cables, saving you time and money. Build your own portable broken-wire detector and eliminate frustrating troubleshooting!... [read more]

Build a versatile 1.8 to 230V voltage detector circuit with a red and green LED, perfect for simple and cheap electrical testing and experimentation. This innovative design utilizes a filament lamp to safely detect voltage fluctuations, empowering you to understand and measure electrical systems effectively.... [read more]

Build your own precision continuity tester and unlock the secrets of reliable electrical connections. This DIY circuit, featuring a threshold-adjustable op-amp design, helps you quickly identify good and bad contacts, ensuring optimal performance in your electronics projects.... [read more]

Build a precision continuity tester and master the art of diagnosing electrical connections with this innovative DIY circuit. This powerful tool, based on an op-amp comparator, lets you easily identify good and bad contacts, optimizing audio installations and ensuring flawless performance in car stereos, public address systems, and beyond.... [read more]

Measure zener diode voltage accurately with this reliable circuit. This 25Volt circuit uses a half-wave rectifier and a current limiter to determine the zener voltage, providing precise measurements and ensuring stable operation.... [read more]

Build your own Zener Diode Tester with a powerful 555 Timer circuit, generating up to 120 volts AC to rigorously test zener diodes from 1 to 2mA.... [read more]

Build your own XTal oscillator circuit and ignite a 100KHz to 30MHz signal with this simple tester.... [read more]

Build a powerful 1.8 to 220 Volt DC or AC detection circuit with a minimum of six components. This simple and affordable schematic empowers you to easily measure voltage levels and witness the mesmerizing glow of a 6W filament lamp as it responds to your chosen voltage.... [read more]

Uncover the secrets of transistor testing with this ingenious circuit. Precisely measure transistor performance down to 40 ohms and confidently diagnose issues in amplifier circuits. This 12Hz circuit utilizes a 555 timer and flip-flop to illuminate LEDs, revealing whether transistors are good or faulty – a powerful tool for any electronics enthusiast.... [read more]

Build a powerful astable multivibrator circuit to effectively test N-mosfets like the IRF830 and unlock the potential of your electronics projects.... [read more]

Build precise test circuits with this innovative 1.5V battery-powered signal tracer, generating narrow pulses up to 800Hz for comprehensive amplifier and receiver diagnostics.... [read more]

Build precise electronic circuits with this low-resistance continuity tester, ideal for checking soldered joints and connections with a 0.25-4 ohm range. Unlock optimal performance and illuminate your projects with this powerful diagnostic tool.... [read more]

Unleash your diagnostic potential with this innovative circuit, perfect for pinpointing faults in audio and radio equipment. Generate rich harmonic square waves or trace audio signals with precision, empowering you to build and repair complex electronic systems.... [read more]

Build a powerful low voltage monitoring circuit and safeguard your critical battery systems. This innovative design alerts you to voltage fluctuations, triggering an alarm and LED indicator, while offering limitless integration possibilities for advanced projects.... [read more]

Test quartz resonators from 32kHz to 24MHz with this innovative circuit. Verify resonator performance using LED and acoustic signals, utilizing a BC547C transistor and a versatile two-positional switch for precise frequency adjustments. Build your own frequency testing solution today!... [read more]

Build your ultimate servo control system with this innovative tester, featuring a 20ms frame duration and precise potentiometer control for seamless servo movement and automated testing. Download the schematic, PCB, and assembly code to unleash the full potential of your servos.... [read more]

Quickly assess battery health with this innovative circuit, testing 1.5V to 15V cells and revealing hidden power. Build a powerful diagnostic tool and unlock the true potential of your batteries!... [read more]

Unleash the power of your TTL circuits with this essential Logic Probe. Accurately determine logic states – High, Low, or Impedance – using this simple tool. Supply Vcc and GND, connect the Test wire, and witness the LEDs illuminate, revealing the precise logic level for critical circuit analysis and debugging.... [read more]

Build a powerful diode tester with the PIC 16F84 and unlock limitless possibilities for your projects. This innovative circuit utilizes a clear and intuitive design to accurately test diodes, providing a robust solution for your engineering endeavors.... [read more]

Build a precision picoammeter with a CA3420 BiMOS op amp and measure currents down to 0.2pA with four distinct ranges. This innovative circuit includes transient protection and an offset nulling potentiometer for unparalleled accuracy.... [read more]

Build a versatile circuit capable of measuring from 10mV to 50V RMS with eight distinct ranges. This innovative schematic utilizes precision components to deliver accurate measurements, ideal for calibrating meters and analyzing signals across a 20Hz-20KHz frequency range. Unlock the full potential of this design by connecting to your Avo-meter set at 50uA for comprehensive signal analysis.... [read more]

Build a simple circuit with one resistor and an LED to instantly detect fuse failures and safeguard your projects with this innovative design.... [read more]