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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Gain 100 Instrumentation Amplifier 2 (CB15878E)
This second amplifier is based on the integrated LM108 and has a differential input. The resistor...
Logical optical driver (CB7298E)
This circuit was found in a 1968 Motorola documentation. The circuit can be implemented with...
Variable Voltage Source (CB16243E)
Nothing more useful on the bench than a variable voltage source. This is the source we found in...