This circuit was found in Motorola documentation from the 1980s. PUTs are not common components today and lamp power depends on the SCR.
This circuit was suggested by Popular Electronics from the 90s. The circuit is quite simple using...
Found in Radio Electronics from the 90s, this circuit converts signals from the 9.5 to 9.8 MHz...
This interesting amplifier circuit with selectable impedance is from a 1960s book of Gernsback...