Dear diyer, a silly question: is it possible to insert vertical radial power resistors instead of axial ones on the emitters of the final bjts?
Like this:
Same technology certainly: wirewound. In my opinion there should be better heat dissipation, as well as better distribution on the PCB (because developed in height) . I've seen few applications with radial power resistors, I don't understand why: do they have contraindications?
Thank you for your usual availability. a good day everyone
Ros
Like this:
Same technology certainly: wirewound. In my opinion there should be better heat dissipation, as well as better distribution on the PCB (because developed in height) . I've seen few applications with radial power resistors, I don't understand why: do they have contraindications?
Thank you for your usual availability. a good day everyone
Ros
It was used in some old valve tv:s in order not to burn the pcb. To survive the transport they had a mounting clip to hold them in place.
Wire wound resistors normally stands power enough to melt the solders but the old pcbs of pertinax didnt stand 200 degrees.
Wire wound resistors normally stands power enough to melt the solders but the old pcbs of pertinax didnt stand 200 degrees.
thanks for your answer stigi...actually I already knew that this type of resistor was used in old TVs, with valves and discrete components. Said this, I don't see big differences between the radials and the axials specs, except perhaps for the temperature coefficient (higher on the radials); and I try to add: surely also that it is not possible to find a range of low values-fractions of ohms- (which are usually required in this type of application). Anyway; since I'm routing PCB just now, , and I would have found radial resistors of the right value and power: can anyone tell me if it is appropriate to continue in this direction or is better replace the radial ones with the axial ones, explaining the reason please?
Greetings Ros
Greetings Ros
I always place them axial. A power amplifier very seldom gets maximum heat so the max power of the resistor is so unusual that I have never seen burn pcb:s under them.
