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  1. Sadlercomfort

    Schottky Diode - Open Circuit

    Hi Guys, I'm investigating a faulty infrared remote at work, the remotes seem to be discharging the 9V batteries when not in use. Now, upon my initial investigation I noticed that the Schottky Diode which protects the circuit from reverse polarity was open circuit. I then confirmed this fault...
  2. Sadlercomfort

    24v Keypad - Microcontroller

    Hi guys, Does anyone know how to interface a 24v keypad to a microcontroller. Usually I would use a 5v keypad and connect it directly to one of the ports with pull up resistors. However I can only find a 24v one for cheap on farnell so I have to use this...
  3. Sadlercomfort

    16 Bit LCD programming

    Hi Guys, I'm trying to learn how to program LCD modules with a pic16f73. Does anyone have some useful information on what I need to know? I understand how to connect each pin up and what there functions are.. but I'm struggle to understand how to write text to it in code. For example how to...
  4. Sadlercomfort

    Including header files

    Hi Guys, Does anyone know how to use header files to simplify programming. I'm using MPLAB and HI-TECH compiler.. programming in C. I've managed to create my .h file with the C programming inside, so how do i include that in a general program?
  5. Sadlercomfort

    Charging Batteries using a Power Supply

    Hi Guys, Is it possible to charge two 12v, 7AH lead-acid batteries in series directly off my DC power supply? I was thinking maybe setting the current limit to about 3A and voltage to about 28-30V. Thanks, Ash
  6. Sadlercomfort

    Capacitor Sizing - To Big/Small

    Hi Guys, I need some help finding information about capacitors and sizing. I'm trying to learn about 'Failure Modes and Effects Analysis' reports, currently writing about capacitors and how under-sizing and over-sizing can effect the circuit. I'm trying to find out how the value of C1 effects...
  7. Sadlercomfort

    Mechanical Counter - Debounce

    Hello, I am currently using a mechanical counter which counts every time the circuit is made (See attached Type AW 15.01). The circuit is made as a mechanical arm slides a butterfly metal contact on a matching metal strip. One end of the counter is essentially connected to GND and the other...
  8. Sadlercomfort

    Creating a latch circuit with logic gates

    Hi guys, I'm trying to create a circuit which takes 9 push-to-make switches, and switches a single output to high when you type in a specific combination. I've been experimenting with latch circuits using two NOR gates but am getting no where. I know that i can use AND Gates, which will set...
  9. Sadlercomfort

    Looking for a suitable transmitter

    Hi Guys, I would like to find a transmitter capable of transmitting data up to a range of 10-25 meters. The transmitter should be capable of transmitting underwater, fully-submerged at a depth of 1 meter. Now here's my problem. The transmitter needs to be small enough to fit inside a thick...
  10. Sadlercomfort

    Microcontroller, Stepper Motors and a 4-Axis Drilling Machine

    Hi Guys, I have been given an assignment where I need to design a 4-axis drilling machine, with 4 stepper motors and a PIC micro-controller. The X, Y axis will be controlled using a lead-screw, moving the work table. The Z-axis will also be controlled with a lead-screw, but moves the drill head...
  11. Sadlercomfort

    Hot Air Station - Finally arrived!

    Hi Guys, Just would like to share my excitement for my new hot air soldering station. What an awesome piece of kit to have, I'm looking forward to repairing a few things I outlined in my previous posts. An interesting thing I've noticed with this tool, is how precised you have to be when...
  12. Sadlercomfort

    USB Memory Stick, unknown smd components

    Hi Guys, I have a usb stick which has become damaged due to dry solder on all 4 usb contacts on the pcb. I tried to do a 'quick' fix, which I wish I hadn't done. Because the soldering iron removed two smd components off the board. I've finally bought a hot air station to replace the smd...
  13. Sadlercomfort

    Creating my own transformer

    I would like to create my own transformer for practical purposes. I would need a square shaped core that is laminated. I can't find where I could buy one, that is large enough and just a square. I'd like to have it around 20 cm x 20 cm. Does anyone know where to buy one?
  14. Sadlercomfort

    Faulty Laptop Charger - 0.7mm

    Hi Guys, I'm having issues with my laptop charger. Its a problem with the dc plug, which has an internal diameter of 0.7mm and external diameter of 2.5mm. When plugged into the laptop, it feels really lose. When you put slight pressure on it, it starts charging like normal. I've tried...
  15. Sadlercomfort

    What can I do with this motor?

    Hi Guys, I have a motor out of whirlpool condenser dryer. If you google: C.E.SET cpi 2/55 132/IRA-F1 It shows up. I have always wanted to experiment with generators but have never find the right motor. Can someone tell if this one can be used as a generator? If not what types should I be...
  16. Sadlercomfort

    Laptop Doesn't Turn On

    Hey Guys, My laptop went dead yesterday, my girlfriend plugged everything in then put the plug in halfway by accident. This couldn't have gone good. The laptop adapter still outputs the 20v it needs. When plugged in the laptop battery charging light flickers orange and wont stay solid green...
  17. Sadlercomfort

    Laptop Seems 'Dead' won't turn on

    Hello Guys, I have a laptop I'm looking at for my friend. It doesn't show any life at all. You plug the adapter in and the battery light indicator doesn't show that it's charging. And when you try turn it on, nothing happens. I've tested the dc adapter and am getting the appropriate 19.5v so...
  18. Sadlercomfort

    Battery Voltage Drop

    Hi Guys, I have a battery which is supposed to show 6v on the output when charged, but is only showing 4v. I noticed that the charging voltage should be 7.2v-7.5v however the adapter which is being used has 6v output. So just to verify, If i use a 7v adapter to charge my battery will my...
  19. Sadlercomfort

    Solar Panels

    Hi Guys, I have a few recycled solar panels about, so I decided to string them together. I'm getting a steady 4v on the output, with 8 small panels. I'm trying to connect it to a 0.9v-5v to 5v DC-DC Booster Module. The problem is the 4v drops when connected to the module, but rises when its...
  20. Sadlercomfort

    RCD Fault

    Hi Guys, I thought I'd mention a fault I found yesterday. My brother had an intermittent RCD fault, so I ruled out the socket and then the cooker first because I know the fault is common in these appliances. Turns out it was the washing machine that was tripping the RCD, so I opened it up...
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