Posts Tagged ‘circuit’

Push button toggle switch, old style

Monday, May 5th, 2014

Bertho of Vagrearg writes: I recently answered a question about how a specific circuit worked and I was so intrigued that I just needed to write down my findings and share it. The circuit uses a single (cheap) push-button to make the output toggle with debouncing and no-delay switching. The circuit...

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Posted in how-to | No Comments »

Solar panel charging circuit

Tuesday, March 19th, 2013

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 have a diode in series with the charging circuit to...

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Posted in power supply | 3 Comments »

Simple circuit to turn your oscilloscope into a TDR

Tuesday, March 12th, 2013

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. Most people think a TDR is more complicated than this....

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Posted in oscilloscope | 1 Comment »

Noise of a Non-inverting Operational Amplifier Circuit

Saturday, February 23rd, 2013

[embed][/embed] This video discusses the total noise of a non-inverting Operational Amplifier (Op Amp) circuit by Analog Devices' Matt Duff.

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App note: Current sense circuit collection

Sunday, January 13th, 2013

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 and/or controlling current flow is a fundamental requirement in many...

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Posted in app notes | 2 Comments »

Embedded MP3 module

Tuesday, November 27th, 2012

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 MP3 files (up 65,536) are stored in a micro SDcard....

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Posted in idle | No Comments »

3D printed circuitry

Sunday, April 15th, 2012

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 solvents for my heated nozzle - resulting in the nozzle...

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Posted in 3D fabrication | 3 Comments »

Digitally adjustable precision reference driven via PWM

Monday, March 12th, 2012

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 to supply a stable reference votlage. This circuit is cheaper...

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Posted in Processing, project logs | 3 Comments »

Voltage booster from discrete components

Friday, September 9th, 2011

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.

Posted in components | 1 Comment »

App note: Overvoltage protection for amplifier outputs

Sunday, June 19th, 2011

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 (a shunt regulator, diodes, and an n-channel MOSFET in series...

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App note: Automotive power circuit handles interruptions and 72volt spikes

Saturday, June 4th, 2011

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 up to 72V.

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Posted in app notes | 4 Comments »

App note: Low-cost circuit converts clock to low-distortion sinewave

Saturday, May 7th, 2011

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 harmonics, and filtering the result with an 8th-order lowpass, switched-capacitor...

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Posted in app notes | 2 Comments »

Jameco Puzzler: a non-electronic voice transmitter?

Tuesday, May 3rd, 2011

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 from touching the ground? Visit the Jameco site for more...

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Posted in site | 6 Comments »

App note: Monitor negative power supplies

Sunday, March 20th, 2011

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 multiple negative voltages, use the MAX974, which includes four comparators....

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1.5 to 10 volt inverter

Friday, March 4th, 2011

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 10 volt output from 1.5 to 4.5 volt input.

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Posted in how-to, power supply | 4 Comments »

App note: Locked-sync sine generator

Thursday, February 17th, 2011

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! (more…)

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Jameco Puzzler

Thursday, January 6th, 2011

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 solution to this electronics puzzle.

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Posted in site | 1 Comment »

Simple current limiter is programmable

Saturday, December 11th, 2010

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 n-channel MOSFETs. The sense-resistor value determines the maximum current limit....

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Posted in power supply | No Comments »

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