Rectangular and triangular generator (CB21333E)

This circuit, based on a 555, was found in a Popular Electronics from the 90s. The circuit has the frequency determined by R1, R2 and C1.

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Automatic Lightin (CB1329E)
This circuit for the automatic activation of a small lamp (or high brightness LED) was found in...
Power Supply with Digital Selector (CB17684E)
This circuit, published in 2009, offers excellent voltage regulation due to the use of an...
High Voltage Electrolytic Capacitor Test (CB6885E)
This circuit, when connected to the 110 V power grid makes it possible to test capacitors with...