Power zener (CB21503E)

In the figure we have the way to implement a power zener diode. The voltage depends on the zener, and the maximum current of the transistor.

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AC Amplifier TL061 (CB14495E)
The circuit is from Motorola's Linear Databook from 1990, but the configuration is current because...
Inverter source (CB8132E)
Found in a 90’s 73 magazine for radio amateurs, this circuit provides a few milliamps of output...
Heads or tails 555 (CB22202E)
This is another one of the many versions of this circuit that we have in this section. We found it in...