Hello. I have a design issue with finished project. I have to drive 4 separate coils at 60 to about 300 Hz and have been told that the current must be 1A each and i have done it with 4 PNP BJTs "КТ818Г" (Russian made ~ 10 amps, TO-220 package) FOr 1 amp i had them naked but not they tell me that has been mistake and the current must be 4 amps and it is not working in the moment. Have to increase it .. That is ok but i don't have space for radiators inside the tiny box ... Should i go for some high power mosfets and again - naked ? (expensive stuff) This device will work more then 90 min at time.