Publication AA-10A-1 25 Watt Audio Amplifier by John Keith DETAILS AT
http://www.bwcelectronics.com/projects/AA10A090.pdf $16.00 The SM0VPO 4 watt audio amplifier .See details here:
http://www.sm0vpo.com/_download/index.htm MOTOROLA REPLACEMENT 5W AUDIO BOARD FOR OLDER STYLE
EXPERNAL SPEAKER $8.00 ARRL HB CHP28 FIG.10 (92) AUDIO AMP
WITH AGC (ALSO CHP28 FIG.15
(88-91)) $4.50 ARRL HB CHP28 FIG.13 (92) AN
EXPANDED HEADPHONE MIXER (ALSO
CHP28 FIG.18 (88-91)) $4.50 ARRL W1FB QRP NTBK 1991 FIG.
3-22 ACTIVE CW FILTER $6.00 73's May97 AUDIO MULTIPLEXER FOR YOUR FREQUENCY
COUNTER FOR MEASURING CTCSS TONES BY KB8XI $6.50 73's Nov96 MAGICAL
AUDIO FILTER USING MC1458 &MAX295 IC1s BY JIM
PEPPER $7.00 73's May94 CRIPE HYPER AUDIO FILTER $5.50 73's Dec93 DELUXE COMM AUDIO BY CURRY $8.50 73's Jul93 UNIVERSAL SPEECH PROCESSOR $5.25 73's Feb93 SWITCHED CAPACITOR AUDIO FILTER TONE
PROCESSOR $5.00 73's Nov92 THE NOISE REMOVER, BASIC NOISE
LIMITER $3.50 73's Nov92 THE NOISE REMOVER, BASIC NOISE
LIMITER, PLUS FILTER $4.25 73's Nov92 THE NOISE REMOVER, BASIC NOISE
LIMITER, PLUS FILTER & AMP $4.50 73's Oct92 NOISE BLANKER (LARGER BD) $4.50 73's Oct92 NOISE BLANKER (SMALLER BD) $3.50 73's Aug92 DIGITAL ALC $9.00 73's Jun91 HW-8 AUDIO AMP $3.50 73's Jun91 PSEUDO CW FILTER $6.00 73's Dec90 AUDIO POWER TAPE RECORDER
CONTROLLER $4.50 73's Sep90 SOLUTION AGC CIRCUIT $5.50 73's Apr90 BLANKER FOR TS940S $4.50 73's Feb90 CONTEST QUALITY HEADSET AND MIC
AMPLIFIER $4.50 73's Dec89 VOX FOR THs $3.00 73's Jul89 4 IN/5 OUT AUDIO MIXER $9.50 COMM QRTRLY Winter 97 LOGARITHMIC AUDIO SPEECH PROCESSOR BY
W. SABIN (TWO BOARD SET) $14.50 CQ Jul97 WIFB QRN 'SQUELCHER' MK-III
PROJECT $5.50 CQ Nov96 DESK TOP MICROPHONE PREAMP USING
2N7000 FET BY RICH LITTLEFIELD $3.50 CQ May96 WIFB 'SQUELCHER' NOISE ELIMINATOR
MK-II $5.75 HR Apr89 MULTIBAND SPEECH PROCESSOR $4.50 NUTS&VOLTS OCT'07 ANALOG MIXED AND
MATCHED, A 4INPUT/OUTPUT DISTRIBUTION AMP BY CICCHINELLI, 4
BOARD SET $18.00 NUTS&VOLTS Mar03 $11.00 NUTS&VOLTS Dec97 MIDI TO SYNTHESIZER INTERFACE BY
THOMAS HENRY (SOURCE CODE AVAILABLE FROM
http://www.prairie.lakes.com/~map/ ) $13.50 NUTS&VOLTS Jul93 PARABOLIC MICROPHONE AMPLIFIER BY
CHARLTON $4.50 PE May98 $8.50 PE Sept' 74 BUILD A 400 WATT STEREO AUDIO AMP THE
AMPZILLA 2 BOARD SET $33.00 QEX JAN/FEB 08 A SQUELCH AMPLFIER BY KE5KSC $7.50 QEX Sep/Oct01 (Tech Notes) $5.50 QEX Jul85 MORSE CODE SHAPER $12.50 QRPp Summer98 SWITCH CAPACITANCE AUDIO FILTER BY JIM
PEPPER $6.00 QST Jun08
AUDIO INTERFACE FOR
FIELD/CONTESTING BY K0IZ
(SEE
PICTURE) $8.50 QST JAN07 SIMPLE COMPUTER TO TRANSMITTER
MORSE KEYER INTERFACE click here $4.00 QST JUN06 LOW COST ACTIVE AUDIO FILTER FOR
CW USING LM324 BY WA9PYH $5.00 QST Jan05 $8.50 QST Dec02 $13.50 QST Jul02 $5.50 QST Feb02 CW GENERATOR AND AUDIO DISTRIBUTION
SYSTEM BY RYNONE $8.00 QST Dec00 NOISE
CANCELING WITH ELECTRET CONDENSER MICROPHONES BY
SPICES $4.50 QST Nov99 $7.50 QST May00 IMPROVING
THE HAMTRONICS R139 VHF WEATHER- SATELLITE RECEIVER
INTERFACE BY JIM KOCSIS $4.50 QST Jul98 $6.00 QST Nov97 $7.00 QST Nov95 AMSAFID, AN AUTOMATIC MICROPHONE
SWITCHER AMPLIFIER FILTER INTEGRATOR DISTRIBUTOR BY
MANDELKERN $7.00 QST Jun95 CONTINUOUSLY VARIABLE BANDWIDTH AUDIO
FILTER USING MAX295 IC'S BY BRAMWELL $7.00 QST Mar95 AUDIO BREAK-OUT BOX BY
SPENCER $7.00 QST Feb95 AGC AUDIO PREAMP BY MILLER $4.50 QST Dec94 SPENCER 1 W AF AMPLIFIER $4.50 QST NOV 94 TWO TONE GENERATOR USING TWO TRANSISTORTS
SOCILLATOES. $5.50 QST Dec91 QUALITY DESK MIKE $4.00 QST Aug89 DESK MIKE AUDIO PREAMP BY DEMAW (also
ARRL HB'96 PAGE 22.29) $4.00 QST Oct83 A TUNABLE CW FILTER $6.00 R.CROWLEY $9.00 ANALOG DEVICES SSM2165 SSM2165
SPEECH COMPRESSOR MINI-KIT, (2) OP113, SSM2165, 78L05, L1,
AND P C BOARD $26.50
5.00
This page updated DEC. 10. 2011