This circuit was obtained in a magazine for radio amateurs 73 of the 90s. The circuit is based on the XR2206, which is not a component found easily today.
This circuit from an old documentation includes the power supply for the 117 V power grid. It can be...
Found in a Popular Electronics from the 90s, this circuit presents the difficulty of obtaining the...
This ultra-simple 9 V power source was obtained in an Argentine publication of the 1970s, but it...