Test interface (CB8222E)

Found in 90s Popular Electronics this circuit amplifies signals over a wide range of frequencies.

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17 LEDs Sequential (CB16998E)
We found this conventional circuit with 4017 and 555 in a 1995 documentation. It controls 17 LEDs...
Powering in LED (MSB039E)
To power an LED we need a closed circuit for the current flow. We also know that the LED can’t be...
Powerless radio (CB22170E)
This single transistor radio without a power supply was found in documentation from the 1960s. The...