Solar panel charging circuit: A special circuit is needed when charging a battery from a Solar Panel. When the solar panel is not providing any power the battery might start draining current into the panel. One common solution is to … Read more
Simple circuit to turn your oscilloscope into a TDR: This simple circuit allows you to use your oscilloscope as a Time Domain Reflectometer (TDR). This is how it works. Send a pulse down a cable and watch for the reflection. … Read more
This video discusses the total noise of a non-inverting Operational Amplifier (Op Amp) circuit by Analog Devices’ Matt Duff.
Here’s a current sense circuit collection from Linear Technology. The collection is organized by application type and for each one there are a few example circuits. High side, low side, level shifting, high and low voltage, fault sensing, etc: Sensing … Read more
Boris shared a link to this article Embedded MP3 module: This embedded MP3 module is an universal and compact circuit (37 mm x 27 mm) for playing MP3 audio files. The MP3 module can be used in embedded systems. The … Read more
Rhys Jones has been working on 3D printing circuits using a RepRap printer. He has recently made enough progress to have a working circuit. One of the main problems I previously had was solubility. Running molten metals were acting as … Read more
This simple circuit that converts a 5V PWM signal into a variable precision reference voltage with a rang of -2.5V to +2.5V. Many designs, like a digitally controlled power supply, programmable dummy load, etc, require a Digital to Analog Converter … Read more
This is a simple voltage booster based on discrete components: The circuit is excellent and works down to 0.6V. It requires about 0.9V to start. I’ve got efficiencies of 80% using high gain transistors. Thanks Rohit! Via the forum.
rsdio writes: this circuit includes one of my favorites: a dual, common-cathode diode package To protect audio amplifiers and other automotive electronic circuits in the event of an accidental direct connection to the car battery voltage, add the circuitry shown … Read more
rsdio writes: More good ideas to steal and repurpose This circuit maintains power to the load regardless of momentary shorts or opens in the supply voltage, and includes a low-current overvoltage-protection IC (MAX6495) that protects the load against transient voltages … Read more
rsdio writes: nothing beats a pure sine wave oscillator, except another pure sine wave oscillator at a similar frequency: This circuit derives a pure sinewave from a crystal-controlled clock source by using a ring counter to remove the highest-amplitude unwanted … Read more
The legendary Forrest M. Mims, III, created the above puzzler for Jameco. If the radio DJ performing a show while perched on the construction boom drops his cellphone, how can be proceed with his radio show if he is prohibited … Read more
Precision circuit monitors negative-supply threshold: Using an IC (MAX971) that includes an open-drain comparator and a precision 1% voltage reference, this circuit monitors the magnitude of a negative supply voltage and provides a digital warning of fault conditions. To monitor … Read more
If you need a 5 to 10 volt DC power source and only have a couple AA batteries, here’s a simple solution from CoolCircuits. It uses four transistors and a handful of passive components to produce an adjustable 5 to … Read more
rsdio sends an app note: Locked-sync sine generator This circuit synchronizes a sinewave output through three decades of frequency (20Hz to 20kHz) while maintaining low THD and constant amplitude. Thanks for the tip!
In the above figure, what is the simplest way to light the LED when a ball strikes the bull’s eye? The catch: The game should not use a battery or external source of power. Check the Jameco site for the … Read more
rsdio tipped us to an app note on a simple current limiter. This circuit lets you program a current limit without using microcontrollers or data converters. It consists of a charge-pump voltage doubler (U1), a current-sense amplifier (U2), and two … Read more
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