Audio projects become smaller over time with the rapid advancement of technology. A traditional power supply is still considered large compared to audio projects size constraints and it may not fit such delicate applications that need to deliver a good sound with zero noise. Jan Didden, audio specialist who is known for his own publications […]
The SilentSwitcher, A Quiet Mains-free Power Supply Read More »
A recent ebay fishing expedition yielded an interesting little part for the very reasonable sum of about five pounds. It’s a voltage regulator module from a Dell PowerEdge 6650 Xeon server. I originally bought this because I had the idea of salvaging parts from it to use in another project. These are high quality modules
Reverse engineering a server CPU voltage regulator module Read More »
Designers often use thermistors rather than other temperature sensors because thermistors offer high sensitivity, compactness, low cost, and small time constants. But most thermistors’ resistance-versus-temperature characteristics are highly nonlinear and need correction for applications that require a linear response. Using a thermistor as a sensor, the simple circuit in Figure 1 provides a time period
Temperature-to-period circuit provides linearization of thermistor response Read More »
The 555 timer was introduced over 40 years ago. Due to its relative simplicity, ease of use and low cost it has been used in literally thousands of applications and is still widely available. Here we describe how to configure a standard 555 IC to perform two of its most common functions – as a
There are two things that you don’t want to do with any rechargeable battery on a routine basis: Overcharge it. Overdischarge it. While the above are true for lead-acid batteries, they are particularly true of Lithium-Ion chemistries, but for different reasons. With Lead-acid batteries: Lead-acid batteries – particularly the “flooded cell” types (e.g. those to
Disconnect circuit for 12 volt lead acid and lithium batteries Read More »
Ok, before to introduce this project, i want to apologize for my English, my native language is French… Secondly, this is my first Instructable, and it’s the first part of a biggest project (a MP3/SD card/USB/radio/bluetooth/clock/alarmclock/temperature/humidity on TFT touchscreen 3.5″) So, I was searching for a tutorial to create a simple Radio with Arduino… And
If you have a load with a variable or poorly specified resistance and want to regulate the power applied to it (a heater for example), merely controlling the voltage or current will not work, as in both cases the power P = I2R = V2/R depends on R. Instead, let us generate pulses with constant
Opening 26 pieces of windows at the same time in a 2,000-square-meter greenhouse under just 20 seconds? Yes! Story 2 years ago I decided to step to a new level in controlling micro-climate in our thermal water heated greenhouses. Before that time for example we did all airing by opening-closing windows manually. It was a
Arthur English’s group at Emory has developed a custom device that they have used for stimulating peripheral nerves optically in anesthetized mice using a standard optical fiber. The device is compact, rechargeable battery-operated, and controlled either manually or by computer using analog input. Essentially, laser LED illumination is coupled to an optical fiber by a
Abstract The Arduino inbuilt 10 bit ADC, can be used for constructing / measuring the 0Volt to 50Volt Digital Volt Meter. Popular MAX7219 display driver, connected with Arduino Uno will be used for displaying the measured voltage. This voltmeter can read only DC voltage. Parts and components Arduino Uno board Max7219 4 Digit 7Segment Common
