2 lithium batteries charger (CB9128E)

This charger was found in an 80's Electronic Design. The circuit uses components from that time. Equivalents can be tested.

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Hartley Oscillator (CB4255E)
In the figure we have the typical configuration of a Hartley oscillator. This circuit generates...
Audio mixer (CB7985E)
Found in an Electronics Now from the 90s this mixer has several inputs. The integrated circuit can...
1,5 - 28V x 5A Power Supply (CB1217E)
This useful power supply was found in an 1985 Italian publication, but can still be assembled...