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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Mark generator for oscilloscopes (CB23648E)
This is an old circuit with a feature that most modern oscilloscopes have. We found it in a Radio...
Overtone Crystal Oscillator (CB6184E)
This circuit was found on an 80's Ham Radio. The transistor admits equivalent. The circuit can...
Piezoelectric Transducer Amplifier (CB15928E)
This amplifier, suggested by National Semiconductor, is characterized by its very high input...