This is an AVR ISP Programmer which is controlled via COM port. Signal levels of the RS-232C line is converted to the target level, so that target device can operate in entire range of the VCC. And also it can be used as an communication cable to communicate between host PC and target program (this is explained in the following section). This ISP adapter is sufficient to develop most of the AVR applications.
Posted on Wednesday, April 20, 2011 • Category: Amplifiers
So this time I decided to make pretty simple but powerful enough car audio amplifier. For this I’ve chosen quad bridge car audio amplifier TDA7384 which has four input and four output channels with power capability of 4x35W. As datasheets of TDA7384 says it is low distortion, low output noise, low external component count. Also has Stand-By function and Mute function. It has several protections like from output short circuit to GND or to Vs, capable to handle very inductive loads, thermal limiter, load dump voltage. TDA7384 is an AB power amplifier cased in flexiwatt25 (eagle library is included in project archive) package witch is designed for high end car radio applications. It allows rail to rail output voltage swing with no need of boot-strap capacitors.
Posted on Wednesday, April 20, 2011 • Category: Oscilloscopes
On the following article learn about Oscilloscope probes, their basic characteristics and proper calibration. Measuring signals with oscilloscopes may be challenging task especially high frequency ones. Without proper oscilloscope probes correct measurement of high speed time domain signals wouldn’t be possible. For high speed measurement you should consider signal parameters like amplitude, source impedance, rise time and bandwidth.
Posted on Tuesday, April 19, 2011 • Category: Sensors
With this simple circuit you will be able to control the speed of a DC fan according to temperature measured by a temp sensor. It’s an ideal add-on for your PC cooling fans to eliminate produced noise. Requested by some correspondents, this simple design allows an accurate speed control of 12V dc fan motors, proportional to temperature.
A n.t.c. Thermistor (R1) is used as temperature sensor, driving two directly coupled complementary transistors wired in a dc feedback circuit.
An optional circuitry was added to remotely monitor fan operation and to allow some sort of rough speed indication by means of the increasing brightness of a LED.
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