This Japanese radio is from the 60s, presenting excellent sensitivity and an output power of 100mW with 6 V power from ordinary batteries. The circuit is of the superheterodyne type.
The figure shows how to couple two CMOS circuits using an optical coupler to achieve isolation. The...
The Variable Frequency Oscillator (VFO) or Variable Frequency Oscillator shown in the figure can...
The circuit shown is from the National Semiconductor Linear Applications Handbook of 1994. using...