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 circuit was found in an old publication and can be adapted for use with modern...
The circuit presented generates pulses at regular intervals with the duration controlled by a...
The LS150 is an uncommon high-performance operational amplifier today. The circuit is from old...