Usual power charges and power supplies are manufactured with outputs for 5V, 12V or 24V. Sometimes you need a fixed voltage charger with 6V output for charge batteries or other applications. There is available on the market an integrated circuit 7806 with 6 Volts output. However, I don't have this IC in my spare parts collection, so the best solution I found is to modify an existing old charger with 5V output to deliver 6V.

Specification:
- linear regulated power supply
- input voltage: 230 VAC / 50 Hz
- output 6 VDC
- maximum output current: 500 mA
- output protection with short circuit current limiter at 200 mA
- line regulation: max 50 mV

The schematic diagram shows the use of a L7805 circuit with 5 Volts output and a reference made with two diodes to add one Volt to output. One of the diodes is 1N5817 Schottky with low forward voltage drop.

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Links:
[1] - ST L78 datasheet
[2] - 1N5817 datasheet