Götz Kluge's photos with the keyword: morse code

Electronic morse keyer It's a squeeze key built in the year 1972 using CMOS logic. Controls (front side, from left to right) - Power: ON/OFF - Output inversion: ON/OFF - Monitor: ON/OFF, volume - Speed: 6 to 40 WpM - Dot buffer: ON/OFF - Squeeze paddles Driver stage: Selectable power transistors usable as low-side switch Connectors (rear side): - Driver to transmitter (PNP collector&emitter, NPN collector&emitter, CMOS out, ground) - Optional external squeeze paddle Batteries: 9V for logic, 1.5V for monitor See also: commons.wikimedia.org/wiki/File:Elbug.jpg DL5MDA