This is a channel of a stereo amplifier and small power with the LM386 suggested by the Radio Electronics Experimenters in the 1981 edition. The power of a few Watts.
This conventional series reducer circuit reduces the voltage of a 12 V battery to the selected value...
In the figure we have a converter that generates a negative voltage from a positive voltage...
This circuit covers the bands from 1.8 to 150 MHz, with plug-in coils whose characteristics are...