This modulated transmitter for a light beam communication system was found in the 1991 Electronics Experimenter Handbook. The circuit modulates a LASER diode.
The basic idea of the circuit shown in the figure is to increase the brightness of an ordinary...
With the appropriate choice of C1 and C2 it is possible to divide the frequency of a rectangular 3 V...
This circuit was published in a 1979 magazine, but it can still be easily assembled as the...