Signals of up to a few tens of kilohertz can be generated by this circuit found in a European publication from the 1980s. Transistors admit equivalents and the unijunction can be 2N2646.
This circuit can measure signals in bands that depend on the coil. With a coil of 30 turns in the...
In the figure we have adapter circuits for using stereo headphones in an amplifier without a...
We found this circuit in the 1994 National Semiconductor Linear Applications Handbook. The circuit...