This transmitter for the 40 meter or 7 MHz band was found in a magazine 73 for radio amateurs of the 90s. The circuit has a power of ½ W.
This circuit uses a 741 operational amplifier that must be powered by a symmetrical source of 6 to...
This adjustable oscillator has the traditional configuration already presented in other articles. The...
In the figure below we have the main configurations of power supplies with the most used...