Fred points out this schematic for a rather interesting radiotelephone transmitter instantaneously powered by the operator's voice - One of the neatest minimalist amateur radio transmitter circuits around - this one is voice powered - it provides DSB, (double side band)modulation and power from an ordinary 8-ohm speaker - if are in doubt that the circuit works, the maker has the contacts and the voice recordings to prove it!An explanation of how it works + schematic and audio sample can be fou....
MAKE Magazine
