Powerful IR Emitter (CB26030E)

This modulated circuit was found in the November 1997 Electronics Now magazine. The power transistor can be any MOSFET,

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Power supply for LM12 amplifier (CB26149E)
This power supply was found in the same 1990 special issue of Radio Electronics Experimenter...
Alarm (CB11608E)
This circuit, which can use a reed sensor, is indicated for doors and windows. The circuit was...
Temperature measurement interface (CB9598E)
We found this circuit in a documentation from the 90's. Information on the A/D converter was not...