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  1. Sadlercomfort

    Custom PCB

    I'd like to discuss what manufacturers produce the cheapest custom PCB's for hobbyists. There are lots of online company which say they are low cost, but tend to be quite expensive. I know its hard to get low prices for such small orders. A 2x2inch board would be nice. There may be a similar...
  2. Sadlercomfort

    Op Amp for speaker circuit

    Hi Guys, I'm trying to find a simple circuit design which amplifies sound from an audio jack, to two 8ohm speakers. I only have quad LM324 op amps. Thanks, Ash
  3. Sadlercomfort

    12v 4A power supply

    Hi guys, My friend is working on a project, but he needs a supply which takes 230v on the input and 12v 4A on the output. What is the simplest way to create this supply circuit? I imagine some of the components might be expensive as well, because of the 4A on the output. Thanks, Ash
  4. Sadlercomfort

    Components and Operating Temperature

    Hi Guys, I'd like to get some information about what operating temperatures we can expect to see in common components, and how a fault can effect these operating temperatures. I'm studying fault finding using thermal imaging cameras or non-contact digital digital thermometers, purely out of...
  5. Sadlercomfort

    Corded Drill - How does it work?

    Hi Guys. I have a report to write about a corded drill. This includes inside the drill, its components and how it functions. I can't seem to find the specific names of all the components within the drill. Could anyone please point me in the right direction? The corded drill is AC 230...
  6. Sadlercomfort

    RCD Fault - I'm dumbstruck

    Hi Guys, I have recently installed a new double socket, so I can put both my tumble dryer and chest freezer in a convenient space :) It's flush with the fuse board/consumer unit, and a direct spur from the ring main. However, when I use the double socket, I get an RCD fault. Note: that the...
  7. Sadlercomfort

    12V - 6V circuit to drive motor

    Hi guys, I'm planning to repair my nephews electric-powered quad bike. I measured the '6V 5AH' battery voltage after a full charge cycle with a reading of just 3.6V, so i'm going to replace the battery. Having three spare 12V batteries I decided it would be best to create a small circuit to...
  8. Sadlercomfort

    Ceramic Capacitors Voltage Breakdown

    Hi Guys, Is there a specific breakdown voltage for a 0.1uF (104) ceramic cap? I'm assuming ceramic caps can handle 12v comfortably, but what is the common breakdown voltages of these capacitors?
  9. Sadlercomfort

    Identifying 3 unkown components

    Hi guys, as a learning experience I'd like to identify these components. I have 3 types of components here which I can't identify on the internet. The black components have no markings on them but the other two blue components are both Phillips. One seems to be measured in the unit μM and...
  10. Sadlercomfort

    Help with transformer. Large surge currents

    Hi guys I'm experimenting with power supplies and am trying to rectify 240VAC to a variety of voltages. The transformer has several output pins and two input pins. I have tried connecting the transformer on the primary side to AC, while testing the outputs. I seem to be getting large surge...
  11. Sadlercomfort

    Laptop DC Adapter - Burnt Out

    Hi everyone, my DC adapter for my laptop made a popping sound yesterday and filled the room with a burn smell very similar to those party poppers. On the underside of the board all solder joints/SMD components seem fine and I can't find any apparent damage to the top. All the top components are...
  12. Sadlercomfort

    PIC Programming Xino

    Hey guys I have a K010 Xino basic board, does anyone know if I will need a line driver (Voltage driver) to work with this board? Or does it have it built in? There website () states that Xino Pro contains onboard voltage regulation, but I'm not sure if this applies to the Xino Basic. I'm...
  13. Sadlercomfort

    DC adapter supply question

    Why can't I use a dc adapter to supply a variety of electronic circuits, instead of a battery? When using batteries my circuits will work fine, but using a dc supply from an ac - dc adapter gives me no power at all. The 12v adapter works fine and is tested. So there obviously something I'm not...
  14. Sadlercomfort

    Circuit requires two voltages for supply

    Hello, I'm trying to understand how to build a Royer Oscillator circuit using the LT1172 IC. However this circuit design requires two different voltages, around 6v to supply the IC and around 12v to supply the external part of the circuit. How could I tap off the main 12v supply, to...
  15. Sadlercomfort

    HELP: CCFL (LCD Backlight) Driving Circuit

    I'm trying to make a circuit to power a CCFL back-light from an old LCD monitor. I'm using the old transformer from the LCD monitor as well. However the schematic I've been referring to shows the transformer with 5 pins on the primary side, but the one I have recycled has 7 pins on the...
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