capacitors

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  1. L

    Selecting correct base resistor, collector resistor and capacitor for BJT switch circuit 12v to create handmade multiplex LCD pixel circuit

    Hi everyone, I have been researching this topic for the last seven months without success and this is the first time I have posted on a forum asking for help. I have no training in electronics. I work as a sculptor and have started integrating "simple" (although, not for me) electronics into...
  2. G

    Supermicro 10xDRI-t SMD components and their values

    I have a Supermicro 10xDRI-t and in the ill fate it happened that I dropped it and on the way down it scraped on a screwdriver before I caught it. After inspecting the board I found 2 missing and 1 damages cap (one of the missing ones could have been a transistor). Does anybody know where can I...
  3. D

    Choosing Capacitors for Noise Filtering in Project: Advice Needed

    Hello everyone, I'm currently working on a project that involves controlling a servo motor with an Arduino, potentiometer and displaying servo angle on an LCD screen. I have very little experience when it comes to building electrical circuits. The entire circuit operates on a 5V DC battery. I'm...
  4. C

    Understanding a DC Power Supply

    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...
  5. Longschool

    Looking for RF dielectric heating consulting

    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...
  6. T

    Which (if any) capacitors for these DC/DC converters?

    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)...
  7. S

    Capacitors warming in mains power supply

    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...
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