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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OPAx196 Texas Instruments Power Operational Amplifiers
Texas Instruments' low power operational amplifiers OPAx196 can be found on Mouser Electronics....
SCR Transformerless Power Source (CB13908E)
This circuit operates with input voltages from 50 to 140 V providing an output of 12 V under...
Motor Oscillator (CB3975E)
This circuit mimics the sound of a siren when we turn the axis of the small DC motor. The...