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No amps on power up #ubitx

 

I'm just starting the wiring of my uBITX board: I've soldered up the DC connector and I'm trying to check the current. However, I'm showing 0.00mA and not the 90-110mA the docs say I should be seeing.?I've checked the connections multiple times. The diode is pointing the right direction. My power supply puts out 12.2V. I can measure 12.2V across the solder points on the board. And yet, it seems to be drawing no current whatsoever.

Is there anything I should be doing to turn the board on or otherwise encourage it to start sucking down electrons?
 

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where are you placing your meter probes when checking the current draw?


On 6/01/2018 5:26 PM, Kirk wrote:

I'm just starting the wiring of my uBITX board: I've soldered up the DC connector and I'm trying to check the current. However, I'm showing 0.00mA and not the 90-110mA the docs say I should be seeing.?I've checked the connections multiple times. The diode is pointing the right direction. My power supply puts out 12.2V. I can measure 12.2V across the solder points on the board. And yet, it seems to be drawing no current whatsoever.

Is there anything I should be doing to turn the board on or otherwise encourage it to start sucking down electrons?

 

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I almost hate to suggest it but did you turn the volume know to on.

The only other thing that comes to mind is that (assuming you are using a DVM) that the meter leads aren’t plugged in correctly for the Amps range your are using. ?(Most DVMs use a different terminal for current than for volts/ohms/etc. Some DVMs have different connections for the high current range.)



Clark Martin
KK6ISP

On Jan 5, 2018, at 10:26 PM, Kirk <kirk@...> wrote:

I'm just starting the wiring of my uBITX board: I've soldered up the DC connector and I'm trying to check the current. However, I'm showing 0.00mA and not the 90-110mA the docs say I should be seeing.?I've checked the connections multiple times. The diode is pointing the right direction. My power supply puts out 12.2V. I can measure 12.2V across the solder points on the board. And yet, it seems to be drawing no current whatsoever.

Is there anything I should be doing to turn the board on or otherwise encourage it to start sucking down electrons?
_._,_._,_
 

See if you can measure 12V in other parts of the board.

There was one ham here who was measuring the current with a wire shorted across i.e. you have to disconnect
the PS wire to the board and measure in series.
Put the meter in current range with leads plugged in to current socket of meter.

Raj

At 06/01/2018, you wrote:
I'm just starting the wiring of my uBITX board: I've soldered up the DC connector and I'm trying to check the current. However, I'm showing 0.00mA and not the 90-110mA the docs say I should be seeing. I've checked the connections multiple times. The diode is pointing the right direction. My power supply puts out 12.2V. I can measure 12.2V across the solder points on the board. And yet, it seems to be drawing no current whatsoever.

Is there anything I should be doing to turn the board on or otherwise encourage it to start sucking down electrons?
Gordon Gibby
 

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Did the Raduino ?screen light up?

Sent from my iPhone

On Jan 6, 2018, at 01:26, Kirk <kirk@...> wrote:

I'm just starting the wiring of my uBITX board: I've soldered up the DC connector and I'm trying to check the current. However, I'm showing 0.00mA and not the 90-110mA the docs say I should be seeing.?I've checked the connections multiple times. The diode is pointing the right direction. My power supply puts out 12.2V. I can measure 12.2V across the solder points on the board. And yet, it seems to be drawing no current whatsoever.

Is there anything I should be doing to turn the board on or otherwise encourage it to start sucking down electrons?

 

Well, I feel kind of dumb now. No, I didn't have the Raduino or anything else installed. In fairness to me, the instructions were pretty explicit about checking the power draw?before attaching anything but the power connector. I interpreted that to be like a checkpoint, as in "let's verify that your board didn't break in shipping before we go through all the work of completely assembling it".

My enclosure should arrive today, so I suppose I'll try again once it's all together.
[email protected]
 

Kirk

The instructions are correct. Don't fit the Raduino just check the current.

If you fit the Raduino and you have not fitted the 4.7K resistor on the keyer then the ubix may go into transmit all with no 50 ohm load!

73
Mike
G0CVZ
 

All - turns out my ammeter was reading 0.0A on a simple D-cell and lightbulb circuit. Sorry for the noise!

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