On Jun 30, 8:15*pm, whit3rd wrote:
On Jun 30, 11:38*am, "
wrote:

* * * I have built a mic amp and wanted to check the wave form on a
scope but when I connect the probes to the o/p of the amp the power
supply trips (The Mic operates on 9 volt single rail.)

Is one of your scope probes a GROUND connection? *Couple to the
microphone amp output through a coupling transformer, see if that
helps.

Which power supply trips, the scope, or the microphone amp? *What
are the specifications of that power supply?

Thanks
no the ground connection of the scope is connected directly to the
Amp
Its the power supply connected to the amp that trips or reads about 4
volts instead of 9v
The current of the PSU was set to 1 Ampere.
Please, generally, how do you check the responds of an audio Amp on
the scope? I mean how the probes are connected.