Re: [volt-nuts] Bohnenberger electrometer DANGER

2018-03-08 Thread ed breya
Here's a simplistic view that may be sufficient. Some energy (in the form of charge redistribution, which includes current flow) has to come from the capacitor, and some from the input signal, to do the work needed to push the leaf against gravity. When the input signal is removed, some of the

Re: [volt-nuts] Bohnenberger electrometer DANGER

2018-03-08 Thread Dr. David Kirkby
On 8 March 2018 at 07:19, Andre wrote: > Hi, re. capacitors it might be worth mentioning that the normal equation > assumes charge and discharge through a constant current. > What 'normal equation' do you mean? > Don't forget that the equation includes a non linear term so

Re: [volt-nuts] Bohnenberger electrometer DANGER

2018-03-07 Thread Dr. David Kirkby
On 7 March 2018 at 06:29, Andre wrote: > Please be VERY VERY careful. To be honest its far safer to use CCFL > drivers and rectify them with camera diodes in series and the absolute > minimum capacitance for the job, shunted with a high value resistor. > The problem with 2.2 nF

Re: [volt-nuts] Bohnenberger electrometer DANGER

2018-03-06 Thread Andre
Please be VERY VERY careful. To be honest its far safer to use CCFL drivers and rectify them with camera diodes in series and the absolute minimum capacitance for the job, shunted with a high value resistor. I have a few inverters , 10M resistor packs and diode strips here if anyone has a use