This circuit uses a 555 (according to the diagram) to generate 50 ms tone bursts at a frequency of 1.5 kHz. The circuit is from an 80's Electronic Design.
Wired to the output of any amplifier this circuit makes an incandescent lamp flash according the...
The block shown in the figure, although it is known to many readers, is not always in everyone's memory...
This old amplifying stage was found in radios and small amplifiers of the time. The circuit is...