开云体育

I can tell you first hand that the D882 MUST have a heatsink on it. I actually blew mine up the other day... not necessarily because it was running hot, but because I made an error in adjusting the peak-to-peak voltage from R1 on the DDS VFO board. Thanks to Dennis' input on the subject, I found that the voltage on my DDS was somewhere in the neighborhood of 11 volts and NOT 4 volts! Needless to say, the 49-er operated for a time... then the D882 just popped and the smoke went flying. A TO-126 case is plastic. Even with the 49-er operating at the correct voltage, the D882 is going to be very warm (almost hot) - which mine was before I fiddled with the peak-to-peak voltage adjustment and blew it up.?

You'll have to come up with some clever mounting techniques in order to place the heatsink on the transistor then mount it in its correct spot on the 49-er. A possibility is to mount it with the leads bent at 90 degrees to the board. Of course, that means you've got the transistor/heatsink sticking out the side of the 49-er. If you search for "TO-126 Heatsink", there are several options that come up that may fit in the tight spot on the 49-er board.

I've ordered 20 replacement D882s from Tayda Electronics. Once they come in, I'll be able to play with the heatsinks I have on hand to see what works as far as mounting the combo on the 49-er.

Aaron - N2HTL