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.
This circuit was found in the 1987 Radio Electronics magazine. The components used are integrated...
The operational amplifier used in this circuit is uncommon today, but the configuration can be...
This circuit, for vehicles with a 6 V battery, was found in the 1964 RCA transistors manual....