On Sun, 6 Feb 2005, Ake Hedman wrote:

> Peter L. Peres wrote:
>
>> 
>> 
>> On Fri, 4 Feb 2005, Ake Hedman wrote:
>> 
>>> But Pete... a fox, from a fox&hound set???  Can I use one of my cats 
>>> instead... ;-) What is it?
>> 
>> 
>> You can use the cat only if you are cruel. The fox&hound set is a set of 2 
>> devices, one of which injects a signal into a circuit and the other acts 
>> as a detector for it. They exist in many variations. The simplest would be 
>> an audio generator as fox and a high impedance headphone for hound, to 
>> debug audio circuits. Equivalents exist for audio, pulse circuits, 
>> transmission line circuits and even for tracing buried pipes.
>> 
>> Peter
>
> OK. Pete I got it explained to me off list also. Had never heard the device 
> being named that before even is seeing theme here as well.
>
> Do you say a (my)  signal generator will be suitable for this?

Yes, you make a high impedance injector (1kohm resistor in your case) 
and inject signal into the circuit. You know where the cicruit is not 
supposed to be sensitive at all (f.ex. supply rails) so if you inject 
there and the circuit fails then you know something is amiss, like bad 
grounds etc. Alternatively, you inject into the signal path and look at 
the signal at the output with suitable tools (scope etc).

Peter
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