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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Frequency Selector 741 (CB16232E)
The filter shown in the figure, using only an operational amplifier, is characterized by allowing 1...
Dark activated switch with hysteresis (CB7871E)
Found in a 90s American documentation, this circuit can be used as a shield, just change the...
Amplifier for galvanometer 2 (CB7354E)
Found in a Philips' 1968 documentation, this circuit is slightly different from the previous one. The...