Peak Indicator (CB20736E)

This circuit triggers an LED when the input signal exceeds the peak, or the value set in RV1. The transistors can be the modern equivalents BC549.

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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...