Found in Electronics Now, this circuit generates signals for testing like a signal injector. The frequency will be between 20 Hz and 10 kHz with the indicated components.
The circuits below were found in amarican publication of the year 1958. The transistors are...
With this circuit it is possible to use a control voltage to select audio signals that pass...
This PLL with operational amplifiers was found in 1969 documentation. The configuration can be...