Found in documentation from the 1980s, this circuit uses a SG1524. It is an uncommon integrated circuit nowadays. The circuit provides a current of 20 mA with a symmetrical voltage between 15 and 18 V.
The circuit shown is from a Texas Instruments opto-electronics manual. RE depends on the peak...
WWV is the American broadcaster of hourly signals and frequency standards that operates at 3.5...
This circuit, based on a 555, was found in a Popular Electronics from the 90s. The circuit has the...