Found in an Elektor from the 90s, this circuit can be powered directly by the power grid. The circuit uses a rectifying bridge that can be replaced by 4 common diodes.
This low noise audio amplifier step uses only one transistor and is high enough to operate with low...
We find this circuit in an old American documentation, but it is perfectly current by its...
This circuit for old photo enlargers was found in a 1970s RCA manual. The components are from the...