The circuit shown is from the 1977 GE semiconductor manual. More modern equivalent SCRs can be used. R1 must be wire type.
This circuit with zener diodes was found in documentation from the 90s. The zener diodes determine the...
This amplifier, obtained in an Argentinian publication of the 1970s, provides a 6 W output. The...
This circuit was found in Siliconix documentation from the 1980s. Equivalent operational...