‰  NOW 13 WPM  ‰  TEXT IS FROM JANUARY 2016 QST PAGE 43   ‰

IT IS TYPICALLY RATED 5 OR 8 V DC AT 25 MA MAXIMUM.  FINALLY, I KEPT MY
CIRCUIT SMALL AND SIMPLE FOR ANYONE TO BUILD AND INSTALL.  THE CIRCUIT  I
BUILT VERSIONS OF MY CIRCUITS USING EITHER A TWO LEAD BI COLOR LED, SHOWN
IN FIGURE 1, OR TWO INDIVIDUAL REVERSE CONNECTED LEDS WITH COLORS OF YOUR
CHOICE SEE THE SIDEBAR COLOR BLINDNESS IN RADIO AMATEURS.  I CHOSE GREEN
FOR THE NORMAL POWER ON CONDITION, AND RED TO INDICATE THAT THE PTT IS
ENGAGED.  THIS CIRCUIT REQUIRES A MICROPHONE WITH A PTT SWITCH THAT
ƒ  QST DE W1AW  ‰
CONNECTS TO RADIO GROUND FOR TRANSMITTING.  TRANSISTORS Q1 AND Q2 DO THE
POLARITY REVERSAL.  R1 AND R3 SET THE INDIVIDUAL LED FORWARD CURRENTS.
NORMALLY, Q2 IS ON AND Q1 IS OFF.  WHEN THE CATHODE OF DIODE D1 IS GROUNDED
VIA THE MICROPHONE PTT SWITCH, Q2 TURNS OFF AND Q1 IS ON.  CONNECT THE
GREEN LED CATHODE TO THE COLLECTOR OF Q2 POINT KG, AND THE RED LED CATHODE
TO THE COLLECTOR OF Q1 POINT KR.  R5 SETS THE LED FORWARD CURRENT FOR THE
‰  END OF 13 WPM TEXT  ‰  QST DE W1AW  ƒ