Ion generator (CB7837E)

This negative ion generator was found in a 90s Popular Electronics. The autotransformer can be an automobile ignition coil.

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Six Decade Current Meter (CB6191E)
This Linear Technology circuit can measure currents from 100 pA to 100 uA. The circuit is from the...
Safety Light (CB4785E)
This circuit turns on your car's backlight when a vehicle coming from behind gets too close to it...
5 V TTL power supply (CB12643E)
Using the 7805 circuit as equivalent, we can obtain 5 V with current up to 1 A. This circuit is...