Hi James
Thanks for your feedback on this.
My needs are probably very privative compared to those of the people on
this list. I service a lot of the time without a schematic so I spend a
lot of time figuring out how the circuit works. I was thinking that if I
injected a signal with a known waveform I could follow it around the
amplification circuits and such. My only real need is to create
something that does not appear to already be there. For instance I don't
see many triangle waves, if I produced one I could following it around
with my oscilloscope. So in terms of frequency just a few hertz would
do, heck even 1 would probably be fine. My only concern is that some of
the circuits are high impedance and have low voltages. It might be a
good idea if I could get down somewhere into the uV range.
Thanks again!-Patrick
Lux, James P wrote:
On 6/19/09 6:38 AM, "[email protected]" <[email protected]> wrote:
Hey Robert
Great tip about the attenuator.
I looked up some models on the internet and some look fairly expensive.
I know that I will always be injecting low voltage signals, do you think
it would be wise to buy a cheaper fixed attenuator, let's say 20dB?, and
then just depend on the variable rate that the signal generator?
How precise does your level have to be? How stable?
There are surplus attenuators available all over the place, some variable
ones too.
MiniCircuits has VAT-nn attenuators which are relatively inexpensive (not by
"found it at a ham-fest 30 years ago" standards, though)
Building your own attenuator using chip resistors is another possibility.
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