We found this circuit in a 1977 documentation. The National Semiconductor's LM380 is no longer easily found, but if used on this amplifier it provides excellent reproduction quality.
Found in Popular Electronics from the 90's, this circuit uses 555 integrated and common...
This circuit for heating elements was taken from a 1966 General Electric manual. The SCRs are...
Found in an Electronic Design from the 90s, this circuit uses components from the time. It is...