capacitors

Need help in understanding how this works. In the attached schematic is shown the DC voltage measurements at top of C12 and C13 relative to “b” to be 11.46 volts and 5.4 volts. This means the current through R20 must be 0.0033 amps. However, this amperage through R18, the only DC source to...

Hi, first time posting and first time on the forum please remove if not allowed I was wondering if I can connect with anyone here on whatsapp that could offer some RF consulting for a design I am working on? I am currently trying to set up dielectric heating with a parallel capacitor utilizing...

I’m trying to choose/work out if I need capacitors for the input and output of two DC/DC converters. The first converter is a Murata PAE-29/3-D48, powering this along a ~30cm cable, and a bike headlight, using ~100ma with a ~40cm cable. The second is a Mornsun VCB4805SBO-30WR3 (5v version)...

I built a simple, direct-coupled mains power supply. I wish to get on my load about 6V and 20mA DC. My mains is 220V AC. I used a 1uf 250V capacitor, a bridge, a resistor, and two 100uF tantalum capacitors. The 1uf /250V capacitor (NP) works well, and I got about 7VDC. However, I need a...