Transistorized Bragraph (CB7009E)

This circuit was found in 80's Popular Electronics. The components used are common and the number of indication channels (LEDs) can be changed.

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Automotive Tachometer (CB12605E)
This circuit is from a 1978 publication, being connected to the contact breaker of cars that still...
Two Channel Rhythmic Light (CB14014E)
This circuit was found in the magazine Sperimentare 4 of 1977 and can be easily assembled using TIC...
Battery Monitor (CB5412E)
We found this battery monitor in a 2005 Linear Technology application manual. The circuit uses...