This circuit generates a sinusoidal signal with only -80 dB THD. The circuit was found in a 90's EDN. The frequency is 25 kHz and the components used are from that time.
This circuit was published in a 1979 magazine, but it can still be easily assembled as the...
The integrated circuit of this amplifier is not very common today. The output transistors can be...
Found in an old documentation about neon lamps, this circuit has the frequency basically...