In the figure we have a circuit that uses unusual components, being indicated for low frequency applications. The circuit signal is generated by a unijunction transistor that oscillates at 8 kHz.
In the figure we have the way to use the comparator LM339 and others of the same series with the...
This circuit is from a Poptronics, American magazine of August 2000. The circuit can be assembled with...
The circuit presented is a documentation for radio amateurs from 1978. Implemented with common CMOS...