This circuit is from Mullard 1969 documentation. The circuit operates at a relatively high supply voltage and has a 10 Vpp output. The transistors are of the time, but admit equivalents.
Found in a Popular Electronics from 1992, this circuit uses a PLL567 in an audio meter bridge that...
This circuit was found in a 1991 publication. The transistor can be a general-purpose type....
This is a different circuit for a component from the past, the zirconium arc lamp used in...