Solar flashlight (CB20488E)

This circuit charges a battery to power a flashlight at night. The circuit is from an English publication from 1991.

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Power Amplifier Stage (CB3833E)
This audio stage can be used in siren circuits, sound effects and others to excite a few watts...
FM Booster (CB4298E)
This signal amplifier should be installed near the FM antenna to improve signal reception in...