plumsolly
Well-known member
Signal Leaking Into Power Rails? EMR?
I am finally getting around to putting a spring reverb I built a while back (schematic attached) into a box and I am running into an issue: The signal (from both channels) is coupling into the power supply and some dry signal is showing up on the outputs.
I am measuring about 40mV p-p of signal on the +15V rail.
I am pretty sure the coupling is happening at the constant current driver (IC4 and the two transistors after it). I can see a huge amount of radiation in that area with my scope probe.
Everything is built on perf board.
My question: Is this strictly a layout thing, or is there something I could be doing better, electrically?
Thanks,
Ben
I am finally getting around to putting a spring reverb I built a while back (schematic attached) into a box and I am running into an issue: The signal (from both channels) is coupling into the power supply and some dry signal is showing up on the outputs.
I am measuring about 40mV p-p of signal on the +15V rail.
I am pretty sure the coupling is happening at the constant current driver (IC4 and the two transistors after it). I can see a huge amount of radiation in that area with my scope probe.
Everything is built on perf board.
My question: Is this strictly a layout thing, or is there something I could be doing better, electrically?
Thanks,
Ben
