Using 3 ports, this rectangular oscillator was found in the March 1996 issue of Electronics Now magazine. The maximum frequency is a few megahertz, determined by R1 and C1.
This Philips circuit of the 70's makes use of components of the time. The DZD40 is an uncommon...
This circuit suggested by Motorola can be used as LED high frequency modulator. One possible...
Suggested by General Electric in a 1965 documentation, this circuit can use the TIC106 as an SCR....