Re: RXTX Ensemble 1st OpAmp Test Failure; 2nd OpAmp Test OK
- I don't think you are having a brain or eye problem.
I'm having trouble in this section too
Pin voltages on U11 in my build are
pin 1 2.86
pin 2&3 2.77
pin 4 0
pin 5 2.77
pin 6 3.29
pin 7 3.37
pin 8 4.99
First OpAmp Test Readings:
Voltage at R59 hairpin without bridge resistor: 2.86V
Voltage at R59 hairpin with bridge resistor: 2.86V
Second OpAmp Test Readings:
Voltage at R56 hairpin without bridge resistor: 3.37V
Voltage at R56 hairpin with bridge resistor: 3.37V
I used some wires with alligator clips to connect the 10K resistor to the circuit.
Mark what did you use for a clip lead?
Something is not right with my circuit, but just to see what would
happen I connected it to my S9 31foot vertical and put the power to
it and ran the calibration started HDSDR and the darn thing is
recieving signals. I can tune around the band but if I over do it
HDSDR looses its place on the tuning. the test was done on 40 meters.
--- In email@example.com, "Mark" <mbpeterson@...> wrote:
> Every test on the board to this point is OK. Pin voltages on U11 are:
> Pins 1-6: 2.52V
> Pin 7: 2.77V
> Pin 8: 5.05V
> First OpAmp Test Readings:
> Voltage at R59 hairpin without bridge resistor: 2.52V
> Voltage at R59 hairpin with bridge resistor: 2.35V
> Second OpAmp Test Readings:
> Voltage at R56 hairpin without bridge resistor: 2.78V
> Voltage at R56 hairpin with bridge resistor: 4.02V
> I need fresh eyes (and a new brain).
> Thanks, Mark, WF7M