Circuit Cellar (October 2002)

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Extra resources for Circuit Cellar (October 2002)

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But it doesn’t have to be that way, especially if your application has a bandwidth limited to a few kilohertz, because $10 worth of hardware will turn your PC into a low-frequency, precision DC-coupled arb. ARB IN YOUR PC By the definition above, the PC sound card is a true audio-range arb; it takes the waveform definition stored in the computer’s memory and plays it back as an analog signal in the range of 20 Hz to 20 kHz. wav file and play it back using Windows’ Media Player utility. Unfortunately, the typical 20-Hz high-pass cutoff frequency and uncalibrated output level of consumer-grade sound cards makes them unsuitable for simulating signals that have lowfrequency or DC components.

At initial start-up, the thermistor heats up and the ADC changes in one direction only in a still-air environment. After the VZERO value has been obtained, we continuously read the ADC value. We found a set of param- 34 Issue 147 October 2002 CIRCUIT CELLAR® The coding for the AT90S8535 was completed using the CodeVision AVR C compiler for Atmel. You may download the final version of the code from the Circuit Cellar ftp site. CodeVision offers several versions of its compiler, which include a free downloadable evaluation version as well as a commercial version.

047 µF, the –3-dB cutoff will be 301 Hz. An internal clock that determines the filter’s cutoff frequency drives the chip’s internal four-pole switchedcapacitor filter. For a maximally flat For the example where the cutoff should be approximately 300 Hz (fCLK = 30 kHz), C11 would be 120 pF. A series resistor (R18) can be added to trim the oscillation frequency. m function (b). The output of the PLL-based FM demodulator is shown in (c), depicting how the demodulated signal faithfully reproduces the DC offset and low-frequency components of the ECG.

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