Despite being from a 1969 publication, the transistors used have current equivalents such as BC548 and BC558. The circuit generates signals from 1 500 to 20 000 Hz and 4 scales.
This digital electronic game circuit was found in a 1982 publication. It randomly draws the...
The integrated audio amplifier used in this project is not very common today, but more modern...
We found this CMOS circuit for excitation of a relay in an old documentation. The transistor is a...