This circuit uses an amplifier from National Semiconductor, uncommon nowadays. The numbers in parentheses are for the second channel. The circuit is suitable for old tape recorders.
In the figure we have a practical idea for using the good junction of a partially burned...
This circuit generates signals with precise intensities for oscilloscope calibration. The circuit,...
This receiver receives signals in the range of 3.2 to 16 MHz, presenting a good sensitivity thanks...