grahamdocman
pfm Member
Ignored my own "safety" rule and finished assembly when tired !
I inserted an MJ15003 instead of MJ15004 for Tr10 - fried the O/P transistors and the 0R22 2.5W resistors -
Further proof of tiredness, did exactly the same on the next board !!!!!
I've checked the R100 resistors (2W) and the 1N4004 diodes (D3,4, 6 &7) and all OK (disconnected one leg on each to test) - all fine
I've checked R15 8R2 - also fine.
So it looks like I've got off relatively lightly.
Easy to find replacement MJ1003's
QUESTION: I'm struggling to find the 2.5W 0R22 resistors, but plenty of 3w resistors are available. I'm assuming there's no problem in using higher wattage rated resistors - am I correct ?
Otherwise, anyone know where i can get the 2.5W ones ?
I inserted an MJ15003 instead of MJ15004 for Tr10 - fried the O/P transistors and the 0R22 2.5W resistors -
Further proof of tiredness, did exactly the same on the next board !!!!!
I've checked the R100 resistors (2W) and the 1N4004 diodes (D3,4, 6 &7) and all OK (disconnected one leg on each to test) - all fine
I've checked R15 8R2 - also fine.
So it looks like I've got off relatively lightly.
Easy to find replacement MJ1003's
QUESTION: I'm struggling to find the 2.5W 0R22 resistors, but plenty of 3w resistors are available. I'm assuming there's no problem in using higher wattage rated resistors - am I correct ?
Otherwise, anyone know where i can get the 2.5W ones ?