Even though this kit still has no formal build instructions I decided to go ahead with assembly using the Schematic & parts list. The kit included all parts needed and the tuna can.
The kit has 3 L.E.D.s, but only the orange L.E.D. lit, so upon troubleshooting I suspect the silkscreen for the Red & the Blue L.E.D. may be marked backwards. Also, the board layout is slightly different than the current schematic, for layout convenience I suppose. After solving that little mystery all three L.E.D.s lit as expected.? Mostly this kit is just for fun, but I enjoyed the power measurement & dummy load section. I was able to measure the voltage at the peak & hold circuit so I could calculate the RMS voltage? (including the 0.4 VDC diode drop) & use ohm's law to determine power output of my transmitters. However, the 6 watts of dummy load will never get warm if one stays within the one watt maximum recommended power through the monitor circuit. I recorded this short video just so everyone can see how the L.E.D.s light up.? It was a fun kit to assemble & almost as much fun to troubleshoot to make sure I did not screw up the component installation. BTW, I spent 20 years fabricating test fixtures & writing software to test printed wiring boards for correct assembly that were to be installed in aerospace black boxes for aircraft & spacecraft. I do not miss SMD components, I love the old through-hole components just because that represents the hay day of electronics for me. SMD parts. Once the tiny SMD parts came, microscopes became my tool of choices, but my tired eyes didn't like it, lol.
Cheers es 72,
Davey - KU9L
David Knapp