开云体育

Thanks Gyula, HA3HZ, for your indications on how to lift the pins of the
IC's U6 and U7. I have done so, but the Softrock remains the same, the 5V
voltage keeps dropping and I can't find the cause. I have uploaded some
pictures where you can see PIN 8 of ICs U5 and U6 separated from the board.
I would like to recall that the replacement of the 78L05 was carried out
because I thought that the voltage dropped because it had been damaged, but
I was wrong, unfortunately I broke it and had to replace it with a 7805
instead.

Thank you Chuck Nolin, WA6LTV / 4, for your guidance. I also attach photos
of the Si570. This afternoon I checked that the oscillator works perfectly,
connecting the Softrock to the USB cable of the computer, starting the
CFGSR software and tuning the output frequencies of the Si570 with an hf
radio. The jumpers of J2 i'll correct at the future.

Thank you Ismo, OH2FTG, for your indication about the 7805. Before
mounting the 7805, I read its technical data sheet and also checked
-outside the Softrock- that its operation was correct.
I would like to recall that the receiver was working perfectly at the end
of the RX OpAmps part, but it all broke the moment I completed the TX
OpAmps part.
In the TX OpAmps stage, I have checked with a multimeter the value of the
resistors, they are all correct, but the values measured in R21 and R22 is
does not correspond to that of the real resistors. The resistor on the
board R21 and R22 are 2.21K, but I measure 1.1K.
Also in the Dividers stage, the same thing happens, the resistors R13 and
R14 do not correspond to that of the real resistors. The resistors on the
board R13 and R14 are 10K, but I measure 5K.
The values of these resistors are divided by two in the circuit. Is this
correct, or is it the consequence of a fault in another part of the circuit?
I have uploaded new images of all these comments. There are here:
/g/softrock40/album?id=269060

Thank you very much for the help you are giving me.
73,
José María, EA4B