Форум » » EB104 от K6IF » Ответить
EB104 от K6IF
БУМ:
Ответов - 2
БУМ: Basic passives in place. Note: chip caps C17 and C18 (circled) are the thick ones. Another shot of C17 and C18, they just sit next to each other and get soldered down. T1 starts out like this. Trim and strip the leads, but don't tin them or they may not fit through the holes in the PCB (or just tin the very ends lightly Now tack down this side, you have better access to this side... Now solder down this side, and then go back and completely solder the other side that you tacked down before. Now feed the leads through the PCB with needle nose pliers, and solder them down. T3 starts out like this. Just like T1, trim and very lightly tin the leads. Now solder down the first corner. This can be a three handed operation, so you may want to make a small puddle, then tack this Now work your way around - the second corner of the same side is next. Now the other end of the same side - notice that the right side is still loose. Now repeat the exercise on the other side of the transformer. And finally, solder in the leads (seen here on the left side of the photo). T2 starts out like this. Now install it, keeping the leads in the same polarity. This is critical! Progress so far. WARNING: The jumpers don't have to be insulated, but they must not short to the ground plane that runs under them. If they do, The parts for L1 and L2. There isn't much spare wire, start by cutting it in half. Use one of the beads to get the bend in the right place. Now form the wire completely using the PCB to determine the spacing of the leads. Slip on the beads. WARNING: The ferrite beads are conductive. If they touch the foil at the marked locations, they will short. We used some GC Electronics Insulating Varnish to protect against this. Now mount L1. You need to bend the wires outward just a bit to keep them in the holes while you solder. C11 (two places) mounts in parallel with each section of T3. We used two 1000 volt 430 pf mica caps in parallel to get 860 pf Now mount the board, but only loosely tighten the mounting nuts. You don't need to use lock washers at this stage - we are goin CAUTION: Static Sensitive! Use anti-static measures. Now position each of the four transistors, and trim their leads as nece Trim the Gate leads (the top ones) about 2mm. Trim the right facing middle lead of the two left hand transistors where they ove Now solder them down. Just position your iron tip to heat both the lead and the board, then wick solder under the lead all the
qlc: I could offer to fold the leads of transistor 90 degrees upward to become L-shaped. This way it is much easier to unsolder them, if nedeed.
полная версия страницы