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Brian,

The regulator is a big 3 pin TO220 part hanging off the side of the Raduino.
The display and the Arduino Nano clone plug into the Raduino.

These 3 previous posts are all talking about how to go about looking at that regulator:


From post? ?/g/BITX20/message/67507

The LCD should be lit and show characters on the display whether or not PTT is pressed.
I suggest you use a voltmeter if you have one to look for 5v coming out of the
big MC7805CT three?pin voltage regulator hanging off the side of the Raduino.
The holes in each corner are a safe ground to attach the black lead of the voltmeter.
Use the red lead of the voltmeter to measure the voltage of the right most pin
when holding the board such that "MC7805CT" is rightside up.? Should be around 5 volts.


From post??/g/BITX20/message/67509

When powering the Raduino from a USB port, that right side MC7805CT pin should be whatever
the USB port is giving it, likely a quarter volt below 5v due to a protection diode on the Nano.
When powering the Raduino from the main Bitx40 (or uBitx) board, we have 12v going?
into the left side pin of the MC7805CT, and if that voltage regulator is doing its job
then the right side pin will again be around 5v, but this time the power is not from the USB port.


/g/BITX20/message/67524

If you have the Raduino properly wired up to the Bitx40 and the LCD only comes alive
when you also cable up the USB port, that means the Raduino is not getting powered from the BItx40.
First thing, I'd turn off power, verify that there is a good ground connection between the Bitx40 board?
and the Raduino?by measuring zero ohms between the ground planes on those two boards.

Could be that 12v is not going from Bitx40 to Raduino due to a wiring or connector problem.
Could be that the 12v is not getting regulated down to 5v by the 3 pin 7805 regulator.
Check for both of these by measuring voltages at the 7805 pins as described in my previous post.

I'm guessing the trouble is in how you implemented step 3 of the wire up instructions:??
? ??

where it says:

• Connect the 5-pin connector to the bottom side of the Raduino

• Solder the black wire to the DC power socket

• Solder the orange wire to the DC power switch on the volume control

The black wire is ground, it should go to the ground side of the DC power socket,?
or could go to the ground plane of the? Bitx40.
The orange wire should have 12v on it, connect it directly to your 12v power supply if you must.

Those instructions have not changed since there was a 5 pin connector receptacle on the Raduino,
It is now a 16 pin right angle header and the 5 pin cable connector fits on to one end of it.
If you stare hard at the top diagram on that wireup page, it should be moderately obvious
how that connector should fit in there.? The diagram shows the LCD side of the Raduino,
but with the LCD removed.? Since you say "it seems to work" (receives?) with the USB cable plugged in,
I'd guess you have this 5 pin connector correctly plugged into the Raduino.