Project Solutions (2011/07/22)
Index
Design Your Own IC: Prototyping with CPLDs （part 3）
Published:2011/7/22 3:15:00 Author:Amy
by Paul Goossens Software PC software that can generate the necessary programming files and program them into the IC is required for pro-grarriming the CPLD. Fortunately, the manufacturer of the CPLD has a nice (and free) software package for this purpose (see Figure 6). This software is called Quartus, and it can be downloaded from the manufacturer’s website (http... (View)
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High-End-Preamp （3）
Published:2011/7/22 3:08:00 Author:Phyllis
By Benjamin Hinrichs The control centre The main circuit board, which forms the control centre for the preamplifier, requires surprisingly few components. This is due to the high integration density of the two ICs used here. By far the majority of the components are used to generate clean supply voltages. The circuit is split into an analogue portion and a digital portion... (View)
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High-End-Preamp （2）
Published:2011/7/22 2:47:00 Author:Phyllis
By Benjamin Hinrichs The PGA23I1 stereo audio volume control IC Admittedly, the idea of using a ’digital’ IC for volume adjustment, and further more controlling it using a microcontroller, may evoke a sceptical frown from many an audiophile. Ten years or more ago, this scepticism would certainly have been justified, but the semiconductor industry has made enormous... (View)
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Design Your Own IC: Prototyping with CPLDs （part 2）
Published:2011/7/22 2:29:00 Author:Amy
by Paul Goossens Experimenter’s board Our experimenter’s board has a reasonably simple design. Nevertheless, it has more than enough I/O for performing our initial experiments with CPLDs. Naturally, all of the relevant pins of the CPLD are brought out via several connectors, to allow external hardware to work together with the board afterwards. The schematic diag... (View)
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High-End-Preamp （1）
Published:2011/7/22 2:27:00 Author:Phyllis
By Benjamin Hinrichs The modern design of this preamplifiers yields audiophile specs, convenient operation and an attractive price. This is made possible by using a top-end digitally controlled attenuator/amplifier IC. Analogue audio electronics appears to have entered a dormant stage. In our present age of CDs, DVDs and MP3, traditional preamplifiers have been relegated to the role... (View)
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Design Your Own IC: Prototyping with CPLDs （part 1）
Published:2011/7/22 2:14:00 Author:Amy
by Paul Goossens Designing a circuit always involves several somewhat disagreeable tasks, such as soldering, looking up the pinouts of ICs and laying out a maze of tracks on a printed circuit board. All of this is now no longer necessary, since you can program your own digital circuit in a CPLD. Experimenter’s board features -CPLD version: EPM7128 -JTAG interface -all I/O lines... (View)
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Digital Alarm Clock-- Based on a PIC micro （4）
Published:2011/7/22 2:12:00 Author:Li xiao na
by M. Conde de Almeida Construction The artwork of the PCB designed for the clock is shown in Figure 3. The PCB has to be cut in two to separate the main board from the display board. Start by soldering the wire links onto the main board. Then follow the five IC sockets and all low-profile components. The rest of th... (View)
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Digital Alarm Clock-- Based on a PIC micro （3）
Published:2011/7/22 1:46:00 Author:Li xiao na
by M. Conde de Almeida Control software The entire clock program was written in the PIC Assembly Language using the MPLAB Integrated Development Environment (v. 5.70.40) supplied free of charge by Microchip. The source code and Hex files containing the program ready to be flashed into the PIC microcontroller can be obtained free of charge from the Publisher’s website, see t... (View)
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Digital Alarm Clock-- Based on a PIC micro （2）
Published:2011/7/22 1:17:00 Author:Li xiao na
by M. Conde de Almeida The hardware Figure 1 shows the complete circuit diagram of the clock. All intelligence (and a lot of logic) is vested in the PIC16F84 MCU in position IC5. Using RA0-RA4 and RB5-RB7 as input port lines and RB0-RB4 as output port lines, a fair amount of executable code run from the on-chip memory is able to take total control of the circuit, requiring just a 5-... (View)
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Digital Alarm Clock——Based on a PIC micro （1）
Published:2011/7/22 0:55:00 Author:Li xiao na
by M. Conde de Almeida Although digital alarm clocks have been around for years, most of today’s off the shelf products suffer from serious design limitations. For example, many don’t keep track of weekdays and can only store one alarm time. High time for a home-brew design that does a better job. Off the shelf alarm clo... (View)
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