Posted on Saturday, February 12, 2011 • Category: Arduino
This Arduino can be used for old school prototyping as well. Just use it as a standard ATmega8 and program it with the ISP connector. And it is one of the cheapest Arduino boards, that you can get. Arduino is a great prototyping platform and most of you probably know already about it. If not, check out the Arduino pages and the Arduino playground and dive into it.
Posted on Thursday, February 10, 2011 • Category: Amplifiers
400W Stereo Audio Amplifier based on the original Marshall Leach involvement, but has made some improvements. Regarding the power supply voltage to the +-75V. VC comparing the performance of the modified Leach 700W/2R on one common board of both channels, as well as protection and control circuits for the fans. Compared to the 700W version a bit different in wiring. Because some things in the 700W version is completely tightened to perfection.
Posted on Wednesday, February 9, 2011 • Category: CNC Milling Devices
The electronics of a CNC machine is a simple but often confusing matter. In the picture (down) is shown the schema of a full system of four axes. Sometimes the breakout board is not present and the parallel port connected directly to the controllers. The main advantage of using single stepper controllers enable the user to connect different motors even in a mixed configuration (unipolar or bipolar steppers) tuning the CNC machine performances to the job to be done. A common and simple solution is the use of a board where the optoisolator (if any) and the controller/drivers are present in the same board, all-in-one. This solution allow a general quicker connection and a simple wiring but force the use of three or four identical (or similar) stepper motors.
Posted on Wednesday, February 9, 2011 • Category: Power Supplies
Here is a simple and economical 10A variable power supply with 1.2-30V. LM317 have been used to drive 3 NPN TIP41C transistors (or three 2N3055). Nothing to say about the project, it is really simple. The main supply must be connected to a rectified source (transformer + 20-30A bridge rectifier). For Q1,2 and 3 can be used any power TO220 transistor (TIP132C,TIP41C etc) or three external 2N3055 transistors.
Posted on Saturday, February 5, 2011 • Category: Stereo Encoders
This stereo encoder is a halfway between analogue and digital processing. It combines the best from both domains to provide high-quality and easy to build device. The sampling frequency used in this stereo encoder is 97 times higher than the pilot tone frequency. This makes very easy to reject all spectral residues around the sampling frequency without affecting the main signal characteristics. Using of a microcontroller allows to build this stereo encoder with reduced part count and get excellent results in real operation. This stereo encoder advisedly does not contain any preemphasis circuit. Remember the key fact: a compressor/limiter/clipper device must be always present between the preemphasis circuit and the stereo encoder or modulator. Only this configuration ensures loud sound without exceeding the maximum frequency deviation limit (75 kHz). The stereo encoder is designed to provide really good sound. This always needs to use the compressor/limiter/clipper device where the preemphasis is precisely assured.
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