Hi, You could re-use the existing switch and connect it to the wireless doorbell, but a bit of tinkering will be required. You'll need to dismantle the wireless transmitter (bell push) from it's casing and identity the connections to the actual push switch inside - if you aren't sure post a photo of...

Hi, It is unlikely that a fault in the power LED would prevent the rest of the keyboard from working. Can you see from the circuit board if all the 6 pins are actually connected to anything? It is possible that only some are used. With the battery and mains adaptor removed, you can safely use a cont...

I'd go with something like the Antex 'C' 15W iron (e.g. http://www.maplin.co.uk/15w-miniature-soldering-iron-type-c-4052) or the slightly more powerful 'CS' 18W version. I have both a 15W and a 25W Antex iron. I started out with the 25W 'XS' version, but found it a bit cumbersome for most work, even...

Hi, I'm not sure you need the latching part of the circuit - the input from the brake should charge the capacitor and trigger the transistor & relay, supplying power to the output. when the capacitor discharges the transistor and relay will switch off. I'd remove D2 (so the brake trigger is only...

Hi, Its a surface mount tantalum capacitor, value 100uF +/- 10% (see http://www.electronics2000.co.uk/data/itemsaf/capmarks.php and http://www.electronics2000.co.uk/calc/capacitor-code-calculator.php). The only trouble is I'm not sure of the voltage rating - I wonder if the '6' should be '16' (a com...

Hi, The power supply itself should be protected against overloads and short circuits - I know I've accidentally shorted an output before (don't ask how!) and the PSU simply shut off. Admittedly I don't know if this is affected if you tie the PS_On line to GND as I imagine you have done. That said, I...

It is indeed a sorry state of affairs. The idea of repairing anything seems to have gone out of the window - you just chuck it out and buy a new one. Maplin are the only national component supplier I can think of that you would find on the high street, but even they seem more interested in selling d...

Hi, The replacement power supply you have should be fine, but you need to check the polarity of the output connector, and if it is DC or AC. The input current is of no concern, in the case of the 'new' power supply it will vary depending on the input voltage anyway. It is the output voltage and curr...

The old adapter is almost certainly just a power supply, not a charger, so the replacement should be fine. That said, for safety's sake and since the thing is left on and unattended continuously it might be better to get a proper replacement. If you do use the replacement adapter that you have, chec...

Have you tried a larger supplier such as Farnell or RS? I haven't looked for it for a while, but I'd have thought they would have something. That said I think they both have a minimum order value for non-account customers. Alternatively an electrical wholesaler will have sleeving in the standard 'el...