paul swed wrote:
Startup circuit looks like a bad op amp used as a comparator. U1 section a.
This is a LM 158. I have a LM 148 on hand suspect they are different in
temperature quality. So will look it up and see. This is a common op amp so
if the 148 does not work for some reason any numbers of more modern ones
will. Accept one issue its a T08 can. What pin was 8? ;-)
Regards
The LM148 (quad 741) and LM158 (dual opamp) have different input common
mode ranges, that of the LM158 extends to the negative supply it is also
rated for a large input differential voltage.
LM158 pin 8 is the positive supply pin.
Bruce
On Sun, Feb 13, 2011 at 1:24 PM, Magnus Danielson<
[email protected]> wrote:
Dear Paul,
On 13/02/11 18:50, paul swed wrote:
Magnus it indeed does look very good.
I have re-assembled the various boards and the system locked up as normal
after the warm up period. I do indeed have a failure in the lamp control
startup crkt.
My R&S does not have a startup circuit, so I can't help on that particular
detail. I'm sure you will debug it yourself.
The reference after warm up and adjusting the c field is down in the
1x10-11
area. Anyhow I adjusted the c field and the systems not fully assembled
nor
has it really been stabilized long enough. Was simply curious so I do not
think this is really a very accurate assessment. Especially since this is
time-nuts territory.
At least it proves that you are up and running at least, modulus quirks.
So next steps is to let the unit cook in or maybe I will further assemble
it
and troubleshoot the startup crkt. Add the unlock counter. (A pedometer
and
opto coupler) and let the system run for a long while perhaps a week or so
to see what really happens.
Sounds like a plan.
Thanks for your guidance and help Magnus. Who would have thought there was
a
recovery technique for FRS-c RB references.
Happy to help. Happy to learn of your progress! Happy to hear I contribute.
Cheers,
Magnus
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