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Here are some of over 800 projects from our free circuit diagrams database. For more, try browsing categories menu on the left.

Build Your Classic Tone: LM1036 Circuit Diagram

Craft a powerful stereo audio circuit with the LM1036, offering 75 dB of volume control, ±15 dB tone adjustment, and exceptional 75 dB channel separation. This innovative circuit, utilizing a 9V to 16V supply, delivers stunning audio performance and minimal distortion, perfect for building your next high-fidelity system.... [read more]

Build Your 4017 Decade Counter Sequence Circuit

Build complex, repeatable sequences with a CMOS 4017 decade counter. Control event timing from 9 minutes to 7 hours, creating dynamic circuits for relays, buzzers, and beyond. Discover precise timing control and unlock limitless possibilities for your electronic projects.... [read more]

Automatic Headlight Brightness Switch – Build Your Smart Circuit

Build a smart automatic headlight system to drive with confidence. This innovative circuit seamlessly switches between high and low beams, preventing blinding other drivers and enhancing your visibility on the road. This project uses a phototransistor and relays to create a safe and effective system.... [read more]

Build Your 1669 Digital Volume Control Circuit

Build your dream home audio project with this innovative digital volume control. Featuring precise UP and DOWN buttons, this circuit eliminates noisy potentiometers and offers exceptional performance. This simple, reliable design—using a DS1669 IC and just 0.1uF—is perfect for enthusiasts seeking a clean and engaging audio experience.... [read more]

Build a Light Sensor Circuit with an LED and Op-Amp

Build a sophisticated light sensor circuit using a readily available red LED and a TL071 op amp. Discover how to harness the 2V photo-voltage of the LED, achieving a remarkable 60mV output with a 100MΩ input resistor, unlocking incredible sensitivity for your projects.... [read more]

Variable High-Pass Filter: 20Hz to 200Hz Design

Build a powerful high-pass filter with this easy circuit, controlling frequencies from 20Hz to 200Hz using a 47KΩ potentiometer for precise sound signal shaping and amplification.... [read more]