Most newer DAB+ radios powers up in stand-by mode, but this small circuit will emulate a power button click to make the radio to go from stand-by into active state.
New simplified version as of May 2026, see further down for the old version.
Inside the radio the GND is soldered to the radio GND and the Vcc pin is soldered to the radio supply, which must be between 3 V and 20 V DC.
The PWR SWITCH pins are soldered across the power/stand-by toggle button pins.
Old version:
In this case the circuit has been tested ok with a Sony XDR-16DBP and a Panasonic RF-D100BT DAB+ radios.
Inside the radio the GND is soldered to the radio GND and the Vcc pin is soldered to a supply between 5.2 V and 5.8 V DC. For the Sony radio, Vcc is simply the power adapter voltage and for the Panasonic radio, look for the regulator with 5.2 V output !.
The PWR SWITCH pins are soldered across the power/stand-by toggle button pins.
Another version of the auto switch-on circuit but with 5V DC supply has been tested on the Sony XDR41D DAB radio:
The PWR SWITCH pins are soldered across the power/stand-by toggle button pins.