hi,Thanks for your help Sceadwian, can you tell me wot value diode I should get as a replacement please.
Ive had to modify some lamps, added a Vreg, gives a faster more reliable charge than a series resistor.Really? Most cheap chargers I've seen just rely on the transformer rating to limit the charge rate.
Steve, pictures of your particular device particularly the component you think is burnt out are needed. We can't just guess.
There usually is space to fit a 7805, with a couple of voltage level adjust resistors to give about 6.9V charge voltage from the 12Vdc wart.Guess I was wrong again =) Just seems like a silly (and poor) way to make a charger. I hate seeing stuff like that in commercial products.
Reminds me of your typical cordless phone, the ones that use NiCads and constantly trickle charge them when they're on the hook, usually last about 1 day off the charger and go bad inside 6 months from memory effect on the Nicads. Finally bought a decent (still inexpensive) Panasonic cordless set they last 2-4 days off the charger and at a year and a half old they still hold a full charge. Better yet the battery pack is a simple frame around 2 AAA NIMHs so when they do finally age down replacing them will take less than a minute.