This 1924 receiver uses a battery for the tube filaments and a high voltage battery for the amplifier and detector circuit. The speaker is kind of high impedance era.
This circuit has a common configuration widely used in projects on this site. The transistor is...
Author: Newton C. Braga Published:Aug, 2016 Formato:Book and e-Book Pages:...
We find this circuit in an American publication of 1978. The integrated circuit is the CMOS 4013...