I would like to use two or three 3.7 volt lithium batteries. will the unit work good at 7.4 volts or as high as 12.6 volts. Or do i need to add a 9 volts regulator to the 12.6 volts.
Also my unit is so sensitive, I get a local AM radio station coming in. Can this be eliminated of have I done something wrong?
Both the probe ( the Probe is the hole through version, working on the surface mount next) and amp are in aluminum boxes. It does work great other that that.
I wouldn’t go over 9-10V since the probe is already overly sensitive “by design”. Going over the top with voltage would “potentially” run you into too much gain and increased background noise rendering the probe unusable (in my opinion). I found that the sweet spot for me is around 4.5-5V. If you want to go rechargeable a good option would be, a group of 8 good quality Higher Amps NiMh 1.2V batteries (IE: ENELOPP by Panasonic). This equates to 9.6V. You could also go lower by only using 7 cells. As a side note: Having the “efficiency factor” in mind I would avoid using additional 9V regulators since they constantly drain additional power regardless of the probe being Idle or fed with a signal. Again, this is my choice of how I would do it but….others might have different ideas.
Thanks I will do that; As it happens, I have a bunch of 2000 mAh 1.2 NiMh in a box of spares I scavenged from an old vibration Analyzer meter I took apart.