Alternator regulator (CB7121E)

This circuit was found in Radio Electronics from the 90s. Q3 must have a heatsink and R10 fixes the output voltage.

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LED Constant current source (CB20435E)
With this circuit it is possible to keep the current in an LED constant even if the supply voltage...
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This circuit was suggested by Motorola in its manual of components for optoelectronics (1987)...
Modulated Light ReceiverIR4199S CB13885E (CB13885E)
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