This high impedance step suggested by an English publication can operate up to 1 MHz with 1 V rms output. Input impedance is 1 M ohm.
We found this circuit in an old Mullard (Philips) documentation. The load must be according to the...
This circuit is from a Radio Electronics from October 1970. The circuit uses transistors from that...
Obtained from a 1996 documentation, this circuit uses common components and has a voltage gain of 200...