Download Circuit Cellar October 2010 by Steve Ciarcia Founder Editor PDF

By Steve Ciarcia Founder Editor

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C9H~~ -'- Figure I-The PICI6F877 prototype board program, compile it, and then program the device you are using on the development board. To interface to external circuits, Mikro's development board uses 10-pin dual-inline headers with eight data bits, plus the ground and 5 V. Therefore, circuits built on a separate proto board can be easily plugged into the microprocessor and also have the required power and ground connection. Each port (A through E) has the same pinout. Usually, I build a circuit modul~ and then test it out using short programs to test or exercise it.

Then the signal is down-converted to a fixed intermediate frequency through several heterodyne mixing stages. (Remember that multiplying two signals enables you to get the sum and difference frequencies. ) These down converters must be driven by very low-noise local oscillators in order to get a" clean measurement. That's why spectrum analyzers are not as simple as they look. The first local oscillator is swept to get a plot around the frequency of interest and with a frequency span set by the user.

3" pin spacing) microprocessors with or without sockets. Port headers are connected to 5 V and ground, so power can be easily distributed to the remaining Photo 2-An outline of the RadioShack board PWM 10~S f4- REOI'RD/AN5 RE1rWFVAN6 RE2J'CS/AN7 Ep 12C ~~ 19 20 21 22 27 28 29 30 RCOITIOSCYT1CKI RClfT1OSVCCP2 RC2JCCPl RC3ISCKlSCL RC4ISDVSDA RCs/SDO RC6ITXICK RC7/RXlDT OSC1/CLKIN OSC2JCLKOUT SPI 4~ RDOIPSPO RDlIPSPl RD2JPSP2 RD3IPSP3 RD4IPSP4 RDs/PSP5 RD6IPSP6 RD7/PSP7 ADDITIONAL FEATURES I chose other features as well.

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