The following figure shows the circuit diagram for AM modulating a carrier, c(t),  with a signal, x(t).circuit
c(t)=110cos(60000p t) mV and  x(t)= -1.3 +0.35cos(10p t) V.
The theory is presented in: theory
The next figure shows the arrangement of the components on the protoboard:protoboard
The setting for the function generator which provides x(t), is given bellow:FG
The labelling of the field-effect-transistor (FET) terminals is the following:JFET