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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Low battery indicator (CB9552E)
This circuit was found in a 90s American documentation from the 90s. The components are from that...
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The AT21CS11 memory device offers an extended voltage range to accommodate lithium-ion battery...
Programming the Duty Cycle (CIR101E)
The previous oscillators that use gatesshown in this section, and the 4093 in the basic version,...