Current Booster (CB6973E)

We found this circuit in a Popular Electronics from the 90s. Transistors can be modern equivalents. Observe the high supply voltage.

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Blue Bulb (CB17120E)
Applying a high voltage to a mixed lamp can obtain a bluish light with a decorative effect. This...
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This AC operational amplifier has a power stage and a gain determined by R2. The maximum output...