This PNP transistor power stage was found in the May 1969 issue of Radio Electronics magazine. The circuit uses a transformer for excitation and requires 10W input for full output power.
April 2017 - The new Recon Jet ™ Pro which is Smart Glasses from Intel® can be obtained from...
This one-transistor alarm can be used with much more sensors than the two shown by the figure....
This Popular Electronics circuit can be found in various versions on this site and in this...