Current and voltage 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]

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 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]

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 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]

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 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 breathtaking LED displays with the ICL7107, a 3.5-digit A/D converter featuring internal voltage reference, isolation, and sequential control logic for precise and inspiring projects.... [read more]

Transform a milliamp meter into a versatile volt meter and unlock precise current measurements with this essential guide. Discover how to calculate the perfect resistance for accurate readings, from 1K to 10K ohms, and master the art of scaling your meter for higher current applications.... [read more]