‰ NOW 35 WPM ‰ TEXT IS FROM JANUARY 2017 QST PAGE 62‰ TODAYS KIT PACIFIC ANTENNA DEVELOPED THE EASY AUDIO BANDPASS FILTER KIT AS A COMPANION TO THE 40 METER EASY RECEIVER KIT REVIEWED IN DECEMBER 2016 QST. THE RECEIVER BANDPASS IS QUITE BROAD, AND SOME SORT OF FILTERING IS USEFUL FOR SEPARATING SIGNALS ON THE BAND. THE KIT ALSO INCLUDES AN AUDIO AMPLIFIER THAT WILL DRIVE HEADPHONES OR A SPEAKER. FIGURE 6 SHOWS THE ASSEMBLED KIT. IT CONSISTS OF A 2N5088 BJT BIPOLAR JUNCTION TRANSISTOR INPUT STAGE WITH A 100 RESISTOR AS THE LOAD TO THE AUDIO SOURCE. THE NEXT STAGE USES A LF356 OPERATIONAL AMPLIFIER IN A STANDARD FILTER CONFIGURATION VERY CLOSE TO THAT SHOWN IN SEVERAL EDITIONS OF THE ARRL HANDBOOK. THE PASSBAND IS A FIXED VALUE, SPECIFIED AT PPROXIMATELY 500 HZ. THE CENTER FREQUENCY IS VARIABLE OVER 300 HZ TO 2 KHZ, WITH A POTENTIOMETER CONTROLLING THE BANDPASS LOCATION. FOLLOWING THE FILTER STAGE IS A VOLUME CONTROL AND A CONVENTIONAL 386 AUDIO INTEGRATED CIRCUIT. IT HAS ENOUGH POWER TO DRIVE A SMALL SPEAKER. FOUR SETS OF COPPER PADS PROVIDE CONNECTIONS TO THE INPUT, OUTPUT, AND SUPPLY VOLTAGE 9 12 V DC. AS WITH THE RECEIVER KIT, ITS UP TO THE BUILDER TO PROVIDE AN ENCLOSURE IF DESIRED. PUTTING IT TOGETHER ASSEMBLING THIS KIT IS VERY SIMILAR TO ASSEMBLING THE 40 METER EASY RECEIVER. FIGURE 7 SHOWS THE KIT COMPONENTS AND PC BOARD. THE MANUAL WITH FULL INSTRUCTIONS IS AVAILABLE AS A PDF FOR DOWNLOAD FROM ‰ END OF 35 WPM TEXT ‰ QST DE W1AW ƒ